Eating My Words on Pine Straw

Mulching the grass -- the pine straw shown here has blown out of the beds over the past couple of months.  Of course, this is just the grass near one beds. A similar scene (or worse) can be seen around other beds. Sometimes I rake the pine straw back, but it just blows out again.

It seems like only yesterday (even though it was actually two months ago) when I said unequivocally, loudly and proudly that Pine Straw Makes the Best Mulch.

And now I will say three more words: "I Was Wrong."

(I will then qualify those three words to say, "I was wrong for me. Pine straw may still make a good mulch for some people in certain situations, but it's far, far from a good solution for every landscape."

So why have I changed my tune?

Weeds penetrating pine straw mulch with ease behind an HVAC unit.

I still believe pine straw has certain advantages. Let's look at the six claims I made earlier:

Pine straw is easier and faster to spread than other mulches - I still think this is mostly true. It is easier (since the straw is so light) and fast to spread bales of pine straw versus shoveling several cubic yards of mushroom compost (the only mulch I've tried spreading in bulk).

Pine straw is less expensive - Probably still true, at least initially (read on to see what I mean by that). A bale of pine straw does cover a lot more ground than a bag of mulch, so it probably costs less than bagged mulch even though a single bale is usually more expensive than a single bag of mulch. If you buy your mulch in bulk, I can't say whether or not it's less expensive than using pine straw.

Pine straw is more eco-friendly than bagged mulches - Still seems plausible, both because the pine straw is only packaged with twine (not plastic bags) and because you're not actually cutting anything down (as far as I know) to gather pine straw. Not sure of who wins the eco-friendliness contest between pine straw bales and unbagged mulch delivered in bulk.

Pine straw doesn't look all that great when it is incubating a bumper crop of weeds.

Pine straw looks better - Um, no. I don't think so anymore. Particularly after it has blown around a bit and has a lot of weeds growing through it (see below), I'd say I'm not that enamored with the look anymore.

Pine straw is easy to rearrange - Sort of, as long as you don't mind getting poked a lot by the needles. I will say that it is easy for the wind to rearrange the pine straw for you!

Pine straw stays in place when necessary - Ha! By which I mean, no, it didn't stay in place at all.


So now I will proceed to eat my words (a bit painful given that pine straw is so pokey) and tell you why my love affair with pine straw ultimately proved to be a torrid but fleeting romance.

A sprinkling of healthy weeds mixed in with pine straw around the base of a crape myrtle tree. Getting these weeds at the root won't be easy. You'll need to move aside the pine straw mulch first or simply grab, pull and lift a swatch of pine straw along with the weeds.

Pine straw did a fairly lousy job of blocking weeds - As I see it, there are three main reasons to use any mulch: (1) to beautify your landscape, (2) to improve the soil and (3) to block weeds. Of these three reasons, weed-blocking is probably the most important for me. And pine straw just doesn't cut the mustard in this category. Sure, in certain places if it's piled on really thickly it will suppress weeds (and swamp and low-lying perennials in the vicinity), but any places where you've only got a few inches of pine straw, plenty of weeds will be able to push through. And I'm not just talking about giant pokeweeds, proud dandelions or prickly thistles. Even delicate weeds will thread their way through the straw. Heck, even slender grass blades will find a way through. (And lest you think that the weeds are simply a function of me having not laid the pine straw all that well -- a significant possibility -- rest assured that the landscape beds installed earlier this year in the front lawn by professional landscapers are now also filled with grasses and other weeds. And this is only 1-3 months after the straw was laid down!! I shudder to think of the weed infestation that will be visible as the pine straw decomposes rapidly in the heat of the summer...)

Is this more pine straw that blew into the lawn? Nope, in this case you're looking at grass that has easily invaded the pine straw bed that my landscaper put down just a few months ago.

Picking weeds in pine straw is not fun - The pine straw does suppress some weeds, so what's the big deal if a few weeds get through. First of all, the pine straw will inevitably poke you when you try to pull the weeds, making an unpleasant task even more unpleasant. Second, if you try to pull the weed through the pine straw, you will pull up a decent swath of pine straw in the process and disrupt the thatching of the straw that supposedly (but not really) will hold the straw in place and keep it from blowing or washing away. So you have to first move the pine straw out of the way as best you can so that you can get a clear view of the soil and have a better chance of grasping the weed near the soil surface or digging down to get the root, remove the weed and then push the pine straw back into place, knowing that it won't be long before another weed sneaks through and you have to repeat the process. I'd estimate that the pine straw probably triples (at least) the time it takes to pull a given weed.

Pine straw flies like the wind - That's because pine straw flies with the wind. I was warned about this by a nursery worker last year, but I shrugged it off. Turns out he knew what he was talking about. We get some blustery weather down here. Very blustery. Like 20-30 mile per hour winds are not uncommon here, especially in the winter and spring. And this winter, we've had a couple of storms blow through with 40-60 mile per hour winds. Now I was concerned about this before buying the straw, but I decided to take a chance for two reasons: (1) our professional landscapers had used pine straw on the new beds and I figured they would be unlikely to use a mulch that had a tendency to easily blow away and (2) I had read online (and even seen photos) that pine straw could stay put in windy conditions and even in hurricanes!

I guess the lesson here is either (a) don't believe everything you read on the Internet or (b) at the least, Your Mileage May Vary (YMMV)

In any case, I did as the experts suggested and watered in the pine straw after scattering in to help it settle down and interlock, but subsequent winds still sent a good portion of the straw onto the driveway, into the lawn, piled up against shrubs that acted as windbreaks and goodness knows where else! Most likely some of my neighbors have pieces of my pine straw now!

I will say that not all the pine straw flew away in each wind storm. The pine straw that the pro landscapers had laid in the front lawn seemed to stay in place much better (not perfectly, but better), so it's clear that technique can make a difference here.

I think luck plays a role here too. If your pine straw has a chance to settle in for a few weeks and benefits from one or more good soaking rains that flatten and interlock the straw, it's probably far less likely to blow to the ends of the earth than if you scatter it, water it in and then have a wind storm (or succession of windy days) within the next week or two.

I also think location is a consideration. The straw seemed to be most prone to disappearing was the straw I had placed around the corners of the house where the wind would whip around the structure. (Our professional landscaper said that he had noticed this problem at other homes where folks had tried to use pine straw in foundation beds.)

So I'm prepared to believe that pine straw may be less prone to wind damage in some locations at some times, but I had lots of problems with it on my windy Tennessee hilltop, especially in the foundation beds.

Here's a daylily growing in pine straw mulch. Notice that the pine needles are sort of embedded throughout the foliage.

Pine straw acts like a magician with your perennials -- it makes them disappear! Months ago, when I told my landscaper I was thinking about using pine straw in my foundation beds, he warned me that the straw might be a bad idea because I had so many small perennials in the beds and the pine straw (being fluffy) could overwhelm and obscure the perennials.

In brief, he was right. With really low-lying perennials and groundcovers - things like ajuga, sweet woodruff, blue star creeper, veronica "Georgia Blue", creeping dianthus - you risk having the pine straw simply cover, hide and probably kill the small plants. (I say 'probably kill' because I kept going out there and moving the pine straw when it blew over the plants, so I didn't actually lose anything. But Georgia Blue veronica only get a couple of inches high. If the pine straw blew over it, I don't think it would go through the pine straw and I don't think it would get any light, so it would probably die.)

OK, admittedly you're not going to overlook this aquilegia plant, but it still doesn't look nice with the pine straw scattered over top of it. I didn't scatter the pine straw on this aquilegia - the wind did that for me.

With groundcovers that go dormant like hardy blue plumbago, the pine straw makes it very difficult to even see where your perennial was, so you risk stepping on it and/or digging in that area, thereby accidentally killing or damaging your plant.

With larger perennials or small shrubs, the pine straw won't kill the plant, but it will pile up against it, get tangled in the branches, and generally obscure the plant, making it look messy and less visible. In my experience, it's simply much harder to see most plants against the light-colored tangle of pine straw needles than against a darker and more uniform mulch.

More pine straw tangled up in more daylilies.

If not pine straw, then what?? So I had decided in despair that pine straw really wasn't working out for me after all. It wasn't blocking the weeds. It was blowing all over the place - leaving bare dirt in some places, piles of pine straw up against certain boxwoods and Indian Hawthorns and getting strewn throughout the yard. And it was hiding and diminishing the beauty of the perennials and shrubs.

I had to get rid of it - or at least not make the problem any worse.

But what could I use to replace it?

I thought (and still think) that groundcover plants would be ideal, but they're pretty costly (a single plant can cost anywhere from $2.50 to $10) and none of the groundcovers I've tried have filled in that quickly. And I was (and am) loathe to put in any super fast-growing but invasive groundcovers like ivy or vinca.

I'm still experimenting with groundcovers and have high hopes that some of them will turn out to be a good part of the long-term solution. As I've stated at least twice (this makes it three times), I'm really liking the sweet woodruff. Veronica "Georgia Blue" is tiny, but seemed to survive the winter with no problems. I like that it's evergreen and I like its little blue flowers. Hopefully it will flourish and I'll be able to divide it (or buy new plants). And I've got high hopes for experimenting with sedum and ornamental ginger, perennial geraniums and more.

But meanwhile, I've got to find something to cover the dirt and keep down the weeds that won't blow away, cover up the perennials and groundcovers, look awful or generally make a nuisance of itself.

Could pine bark nuggets save the day? Here are some mini pine bark nuggets that I used to cover a patch of ground where the pine needle mulch had blown away. I've included some neighboring pine straw mulch to allow you to compare color and texture side-by-side.

I went to Home Depot and looked at all the options and the one that looked best to me was pine bark nuggets - or more specifically, mini pine bark nuggets. Here's what I like about them so far:

1. I like the look. It's subjective, but I just like the nuggets. They're sort of rounded and make a nice pattern.

2. They're pretty light. Heavier than the pine straw and hopefully not so light that they'll blow away (they haven't moved noticeably yet on the couple breezy days we've had since I put them down), but probably only half as heavy as a bag of pine fines.

All the pine straw blew away from this bed at the corner of the house and driveway - repeatedly. So I put down mini pine bark nuggets. So far, I'm liking the look and they've been suppressing the weeds like a champ (for a couple of days). 

3. They seem chunky enough to keep down weeds. Pine straw is so fine that there are lots of places for light and weeds to keep through. Larger pieces of pine bark nugget seem broad enough to hopefully block the weeds in most places.

4. They give perennials their place in the sun (or shade). They don't swamp or cover up the perennials. Even tiny perennials like the Veronica "Georgia Blue" or the nearly-flat creeping dianthus can stand up and stand out against the pine bark nuggets.

Even tiny perennials like Veronica "Georgia Blue" that would get swamped by pine straw stand out against the mini pine nuggets.

5. They're durable. Pine bark nuggets decompose slowly. Various sources say they can last approximately three years. (The bigger nuggets seem to last almost indefinitely, which seems to peeve some gardeners who want their mulches to decompose and feed the soil, but the mini nuggets apparently have sort of a three-year lifespan.) That's in contrast with fast-decaying pine straw mulch that supposedly has to be refreshed once or even twice a year - and that's if it doesn't blow away! ;-)

I believe this is a wild geranium. (It may just be a weed.) Either way, it's standing out nicely now against some newly spread pine bark nuggets.

6. No chiggers? Janet QueenofSeaford commented on my last post by noting that she dislikes pine straw due to the fact it often contains chiggers. Also some folks have commented about snakes living in pine straw. Or voles hiding under it. (Perhaps the snakes enter the pine straw to hunt the voles?) Either way, I'm hopeful that the pine bark nuggets will harbor fewer pests. (Not that I have anything against snakes, voles or chiggers, I'd just prefer not to have any of them in my landscaped beds!) Of course, the one benefit to pine straw from a pest perspective is that it is supposedly unattractive to termites, but I was planning to purchase trap-based termite control protection this year anyway.

The pine straw blew away from these daylilies on its own. So I surrounded them with mini pine bark nuggets.  There are still some pine needles trapped in the daylily foliage, but I can pick those out at my leisure.

7. Less fire risk. Some folks around here, like the guy who takes care of our sprinkler system, warned me about the flammability of pine straw as a mulch. From two studies that I could find online (University of Nevada and Journal of Arboriculture) it does seem that pine straw is more dangerous than pine bark nuggets from a fire perspective - particularly with regard to how fast flames can spread through pine straw. Interestingly, both studies note that rubber mulch is very dangerous from a fire perspective - that it catches fire easily, burns very hot with high flames and can be difficult to extinguish. I didn't know that and wouldn't buy rubber mulch anyway (doesn't feed the soil and who knows the source of that recycled rubber?) but I wonder if the folks buying rubber mulch know of its fire hazard issues? (Here's a post from GardenWeb talking about pine straw mulch being implicated in some devastating fires in North Carolina. This is apparently an especially big issue if you live in a home with vinyl siding.)

8. Less messy to spread. Wait, didn't I say that spreading pine mulch was easier than spreading say mushroom compost? Yes, but that doesn't mean it's always fun. Your mileage will definitely vary here because pine straw is not a standardized product. The quality of the straw depends on each supplier. I purchased pine straw three different times from three different suppliers and the quality was variable each time. The first batch of pine straw (from a nursery) was the best. (It was also the most expensive at more than $6 per bale!) Clean bales of good-quality and long leaf straw. I think I had maybe a few charming pine cones from all six bales, but the rest was just straw. Sadly, the next batch of bales (from a landscaping company, ~$4 per bale) were the complete opposite, filled sticks, dirt and debris. It was dusty and messy to spread. I actually wore a mask over my mouth so I wouldn't have to breathe in all the dust. And the pine needles themselves were broken and shorter than the ones in the previous batch. Frankly, if the first batch of pine straw had been as bad as the second batch, I would never have kept trying to spread pine straw mulch or written my initial ode. The third batch (from Home Depot, ~$4 per bale) was of intermediate quality. Less dirt and debris, but the needles weren't as beautiful or long as those in the first batch.

9. Much less messy to transport. Yes, I feel guilty from an ecological perspective about buying bagged mulches, but I will say that pine straw bales tend to shed their needles in the car on the trip home. Certainly not the determining factor here, but unless you have a pickup truck and can hose out the bed after the trip, you'll probably want to bring a tarp to put in the car before loading up the pine straw. And even then, count on picking out and/or vacuuming out pine needles afterwards.

Callirhoe bushii (Bush's Poppy Ballow) was practically invisible in the pine straw. It pops nicely against the pine bark nuggets and seems in no danger of getting buried.

Conclusion - So far I'm loving the pine bark nuggets. But I said that two months ago about the pine straw. So time will tell. The one thing I'm a little worried about is that we don't just get high winds here, we also get heavy rains fairly regularly and some sources warn that pine bark nuggets may have a tendency to float or wash out of beds that are not edged. (Ours are not edged.)

So we'll see about that. At least I am only using the pine bark nuggets on a flat ground, so that will hopefully reduce the risk of them washing away, but I have a feeling that there will probably be some mulch erosion from at least one particular corner near the house and driveway.

As for pine straw, I can see it having limited utility in certain specific circumstances. Wind may wreak havoc with the straw, but rain doesn't seem to faze it, so I can see it working on a hillside (as where my landscaper used it) where other mulches might wash away. (Although I should mention another hazard here that some folks mentioned to me and I've experienced myself -- pine straw gets very slippery when wet. Used on a hillside, it becomes even more hazardous. So if you do spread pine straw mulch on a hillside, I'd avoid it (or at least be very careful walking on it) after a rain.

I could see pine straw also being a decent solution in a very calm environment where there were either no high winds or where there were lots of trees and shrubs to block the wind and create a sheltered microclimate.

And I could see it working over a large area planted only with trees and large shrubs where there would be no concerns about perennials and smaller shrubs getting lost in the mulch.

But even in those areas, it seems like weeds will creep through unless you either (a) lay a very deep and thick layer of pine straw (at which point I'd be worried about critters in the straw, fungus and water getting to the soil) or (b) use weed killer. I think my landscaper is planning on using Roundup (i.e. glyphosate) to take care of the grasses and other weeds growing in the new landscape beds, but I think you'd have to be careful not to kill any valuable plants in the pine straw and besides I hate spraying herbicides or working where they've been sprayed so that's not a good solution for me.

Bringing this opus to an end, I'd like to repudiate my previous praise for pine straw. To anyone who was swayed by my earlier post to consider pine straw for their own landscape, I apologize.

Now stay tuned for an update in a couple of months as to whether my current fling with pine bark nuggets will develop into a stable long-term relationship! :)

PS - If you'd like to stay abreast of the latest developments at Garden of Aaron, you can now subscribe via email! Totally convenient, totally free - what could be nicer?

Six Reasons Why Pine Straw Makes the Best Mulch

Close up on freshly scattered pine straw mulch - love the texture and the color!

If you're accessing this page from a Google search... You should know that my pine straw romance came to a harsh and sudden end within mere months. Click here to read a more recent post about what went wrong and why I've switched to pine bark nuggets.

Before I became a gardener, I never gave mulch much thought. It was just that stuff lying on the ground underneath bushes.

But once I started gardening, I realized what a crucial role mulch plays in the home landscape. If you don't have mulch, you've got bare ground. And unless you're putting down chemical herbicides (which I don't) bare ground is like giving weeds a big "SPACE AVAILABLE HERE" welcome sign.

Mulch plays a couple of other valuable roles too. Organic mulches - which in this neck of the woods typically means pine bark mulch or hardwood mulch - break down over time (some kinds faster than others) and add organic material to the soil. This is particularly important if you're working with heavy crap - I mean heavy clay - soil to begin with. The more organic matter you can add to condition the soil, the better.

And of course, mulch can play an important insulating role too - keeping the plant's roots warmer in winter (particularly important if you like to push zonal limits in your choice of perennials) and cooler in the summer. Where unmulched soil quickly bakes to concrete in the summer Tennessee sun, mulched soil has a decent chance of staying cooler and more workable.

Water from hard rains that hits unmulched clay soil is likely to cause erosion and soil compaction. Once the soil is compacted, water can run off and be lost. Mulch protects the soil and ideally lets the water filter in and get absorbed where it is needed.

So yeah, near as I can tell from personal experience and certainly in terms of conventional wisdom, mulch is good.

So, what kind of mulch is the best?

There's lots of different opinions on this topic. Many folks seem to make their choice based on aesthetic considerations. As I said above, most people in my region seem to prefer the pine bark or hardwood mulches. It's what you find in abundance at the big box hardware stores and in bulk at plant nurseries.

But I'm hear to draw a line in the ... clay ... and make the case that pine needles (a.k.a. pine straw) is a far superior mulch in nearly every way.

Part of the front foundation bed before I spread pine straw mulch. You probably can't tell, but I'd actually added quite a bit of shredded pine bark mulch to this area over the past couple of years (most recently around the newly planted camellia and fothergilla shrubs). But it's hard to tell. To me, it mostly looks messy and unfinished. Spreading a heavy, thick and uniform layer of shredded pine bark mulch over this whole bed would be expensive and difficult.

Here are six reasons why you should consider using pine straw mulch on your property:

1) Spreading pine straw mulch is easy - and fast. I've bought more bags of pine bark mulch than I care to remember. I've had it delivered in bulk. I've also used compost as a mulch. Bark and compost mulches are heavy. Typically you have to distribute them by dumping the bag into a wheelbarrow and then using a big spade or shovel to distribute the mulch throughout your bed. It's exhausting and it takes a long time. I once mulched all the beds around my house with 3 cubic yards of mushroom compost. It took maybe 6 hours to distribute. I probably worked 3-4 hours on my own and 2-3 hours with my wife helping. We were both exhausted by the time we finished. And the mulch really wasn't deep enough to be effective. (We should have probably spread twice as much mushroom compost to have gotten the recommended 2-3 inches of uniform coverage.)

By contrast, spreading pine straw mulch is a piece of cake. The mulch is relatively light and it comes in bales. You just carry the bale to the bed where you want to spread the mulch, cut the two cords binding it, then start grabbing handfuls of the pine straw and shaking it where you want to distribute it so that it falls naturally into place.

I didn't have enough pine straw mulch to cover all of my beds, but I probably did half of them (some on my own, some with my wife's help) in about 1 hour -- and at least 10 minutes of that time was removing some dead annuals (Tagetes patula) so that I they wouldn't get in the way of the mulch. I wasn't tired or dirty when I was finished. In fact, it was kind of fun. Extrapolating, I feel I could probably have mulched all the foundation beds with pine straw in less than 2 hours -- a small fraction of the time and effort that it took to spread the mushroom compost mulch.

2) Pine straw mulch seems more eco-friendly. 20 bags of hardwood or pine bark mulch = 20 plastic bags decades (centuries?) to decompose in a landfill. Not to mention all the petroleum used to make those plastic bags.

You can hardwood and pine bark mulches delivered by the cubic yard via dump truck, but there's certainly a fair amount of pollution involved in having dump trucks make those home deliveries.

Sometimes these wood mulches are reportedly made from trees that were clear cut. Apparently this is a big problem with cypress forests in Louisiana, according to an article from the Virginia Native Plant Society.

I think some other wood mulches are made from discarded shipping pallets. I guess that sort of recycling is eco-friendly in a way, but who knows where those shipping containers have been or what was stored on them.

It seems hard (at least through Googling) to get any authoritative information as to whether pallet mulches contain any harmful preservatives or pesticides, but it seems logical to me that they might contain such chemicals since I'm sure the pallet buyers want their pallets to last as long as possible.

As such, I would personally be leery of buying mulch made from discarded pallets. (There's also the issue of the chemical dyes used to color the pallet mulches.) You can read a lot more interesting debates around colored mulch and mulch made from treated lumber on forums like GardenWeb.

(Again, I'm not an expert on this topic. But it seems like the big risk here is inadvertently using a mulch that was made from wood that had been treated with a preservative called Chromated Copper Arsenate (CCA), which the EPA seems to feel rather strongly should not be used around food crops.)

Anyway, to make a long story short (too late), pine straw mulch doesn't have any of those issues. It comes by its coloring naturally. The color will change over time and get a bit darker and redder after a rain, lighter with sunshine and age, but I think it looks beautiful in all its many shades.

From a packaging standpoint, pine straw mulch doesn't typically come in bags, so you don't have to worry about the environmental costs of manufacturing and disposing of those plastic bags.

The ties that bound the pine straw bales I bought were some sort of tough plastic, but I don't see any reason why the bales couldn't be bound with cord made from jute, hemp or some other natural fiber, and I presume that some pine straw bale packagers do bind their product that way.

And then there's the simple fact that you don't need to cut down a tree to make pine straw mulch. Pine trees naturally shed their needles. So all your have to do as I understand it is gather up the needles from underneath the pine trees, pack them into bales and cart them away as mulch.

(I'm not saying there are zero environmental impacts to using pine straw mulch. I've read that there are some concerns about erosion where the pine straw is removed from beneath the pine trees. But it is my understanding that such erosion issues can be minimized with careful management of the pine straw harvesting. There's lots more on the issue of managing stands of pine trees for pine straw harvesting in this About.com article.)

The fact that the bales are so light probably cuts down on the environmental costs of shipping since I believe that weight is a major factor in how much fuel it takes to transport a product. I can tell you that you definitely do not need a heavy duty dump truck to transport a lot of pine straw bales. In fact, where my former car (Honda Insight) was weighed down to the point that it became a Low Rider when I once tried to transport ~20 bags of mushroom compost, I didn't even notice any weight issues at all with 6 pine straw bales in the back of my Toyota Prius. In fact, the bales were so light that they were skittering around in the cargo area when I turned sharp corners.

Here is another section of the front foundation after I laid down some pine straw mulch. Which do you like better - this photo or the barely-mulched photo above? I like the uniform and softer look of the pine straw mulch. I'm confident it will suppress weeds. And even though a landscaper rightfully warned me that you have to be careful not to cover smaller perennials, with some careful scattering, I think you can actually make perennials really pop more prominently against the pine straw background.

3. Cost and coverage - According to the Lowe's website, a 2 cubic foot bag of mulch costs between $2 and $5. The Grit website notes that 2 cubic feet of mulch will cover 12 square feet of soil to a depth of about 2 inches. Prefer a 3-inch depth of mulch? That same bag would only cover 8 square feet.

Now by contrast, the pine straw mulch I bought at a local nursery cost me $6.50 per bale. (Lowe's sells bales for $3.99, but I don't know if they're the same size, and anyway I like supporting local nurseries when possible.) Bales vary widely by size - and I didn't measure the dimensions of mine before I spread them - but let's go back to Lowe's which estimates that a bale of pine straw can cover approximately 50 square feet when applied 2-3 inches thick.)

So let's say that you have 1000 square feet of soil to cover. And let's say you're willing to only spread your hardwood mulch 2 inches thick. You'd still need 83 bags (!) of mulch to get that much coverage, which would cost $166 to $415, depending on whether or not you bought the cheapest or most expensive mulch. If you wanted thicker mulch coverage, you'd be looking at 125 bags of mulch ($250 to $625).

By contrast, according to Lowe's estimate, you would only need 20 bales of pine straw, which would only cost $80 (or $130 at the higher nursery price).

Of course, if you're buying a lot of mulch, it probably makes sense financially (and from an eco perspective of not having scores of leftover plastic bags) to buy it by the scoop. Nurseries near me sell cubic yards of pine bark mulch and hardwood mulch for around $35. I saw several sources online saying that 1 cubic yard of mulch would cover about 100 square feet. Another source estimated more generously perhaps that the mulch would cover 160 square feet (perhaps spread more thinly). So you'd be looking at needing anywhere between 6 and 10 cubic yards of mulch for around $210 to $350, plus delivery fee (~$50), for a total cost of $260 to $400.

But don't forget the time and effort of spreading all that mulch. Like I said, spreading just 3 cubic yards wore me out. I'd need 2-3 days just to spread 6-10 cubic yards of mulch. That's with someone helping. On my own, it would probably take me 3-4 days. And I'd also need someplace to dump all that mulch. Even the 3 cubic yards took up a good chunk of the driveway. And it's a real mess trying to shovel the mulch off your driveway without damaging the driveway surface. Of course, you could have the dump truck unload it on your grass, but that would probably carry its own set of challenges and potential damage to the turf, especially if some of the mulch was sitting there for days.

And what if it rains after your mulch was delivered? The day our three cubic yards of mushroom compost was delivered, rain was forecast for the next day. You don't want to trying to shovel soggy mulch. And you don't want it washing away. So that means you're under time pressure to work like mad to get the mulch (or compost) distributed before the rains arrive. (Well, unless you have a really big tarp with which to cover the mulch. We had a tarp, but it wasn't big enough. And anyway, we were using it under the mushroom compost to try to protect the driveway from scratches or other damage as we shoveled up the mulch.)

So any way you look at it, I'd say the pine straw mulch is significantly less expensive (say from 50% to 85% less expensive). Much easier to spread on your beds. Much faster to spread on your beds. Incredibly easy  to store inside your garage (or shed, or car) if rains threaten. Really no contest for me on this point.

Here's another close-up on some pine straw mulch laid over creeping dianthus. This is the type of perennial that I would be worried about killing with a pine straw mulch. I'll have to be vigilant to make sure it doesn't get smothered and to uncover it completely come springtime. Alternatively, maybe I'll need to decide in certain beds either to have low-growing groundcovers or to have pine straw mulch. Not sure they'll play well together in all circumstances.

4) Pine straw looks better. I admit this is purely subjective, but I think the pine straw mulch looks much nicer than the bark and wood mulches. The big bark pieces look messy to me, can be painful to dig through and take forever to decompose. The pine fines (finely ground pine bark) disappears really quickly and soon looks (and acts) just like bare dirt. It gets dusty and dry in the summer. It doesn't seem to suppress weeds one bit.

By contrast, the pine straw looks soft and billowy, like a wave or a cloud. It looks natural. I always loved the way that the pine needles looked beneath a big pine tree on our property where I grew up in Pennsylvania. So maybe it's pure nostalgia, but it's just a joyful thing for me to look at the pine needle mulch. And I think the plants look better against the mulch - it provides a uniform background against which they really pop and seem brighter, greener and more vibrant.

5) Pine straw is easy to rearrange. This is important for me because I plan to plant more perennials in the beds and even sow some annual flower seeds. So I need to be able to push back mulch from certain parts of the bed, sow the seeds or add a new perennial, then move the mulch back into place later on. Just as the pine straw mulch is easy to initially distribute, it seems incredibly easy to rearrange as needed.

6) And yet, Pine straw stays in place when necessary. A couple of my mulched beds are near the driveway and a paved pathway. We get a lot of heavy rains here and often I'd find hardwood mulch scattered onto the driveway after a big rain. It's still only been a few days since I put down the pine strawn mulch, but we had some significant rain last night and the straw doesn't seem to have gone anywhere. In fact, the rain seems to help the pine straw sort of 'lock' into place.

I have to admit, this was probably the one major concern of mine. But it was alleviated when I saw that the professional landscaper we hired to redo our hilly front yard suggested using pine straw around the trees and perennials. We had some really strong winds and rains after he worked on the landscape and the mulch seemed to hold up like a champ. So I figured it would do even better on the flatter landscape beds near to the house and so far it has performed up to expectations.

Update - Well, unfortunately some of the new pine straw mulch I put down did blow around a little, especially on one of the beds that was most exposed. We had sustained winds last night of 25 mph with gusts of 35 and we're on a little hilltop, so... Other beds that are less exposed to the wind were less affected. Also, the pine straw needles moved most on the bed that had the least mulch. One commentator on GardenWeb says that spreading pine needle mulch thickly helps keep it in place. (I guess maybe all the needles interlock?) Anyway, most of the pine straw still seems to be there, just shifted a bit onto some of the grass. So I'll push/rake it back into place. According to this site, it seems like maybe I should have watered the pine straw after I spread it to settle it into place. The pine straw mulch put down professionally a month ago still seems to have stayed in place nicely. If anyone has any advice or experience with preventing pine straw mulch from going airborne, I'd appreciate your insights.

There's some more good advice here from a professional landscaper on the best way to install pine straw mulch.

Some fluffy pine straw mulch after I first laid it in one of rear foundation beds. It's probably a little too fluffy in this photo. I found out later that I should have watered it down to prevent some of it from blowing away and shifting when we had some windy weather come through. Then again, I do live on a rather exposed hilltop. In a more sheltered location, watering down newly laid pine straw might not be as crucial, but I'll certainly plan on doing it next time time I scatter pine straw mulch.

Conclusion: 

Despite appearances to the contrary, I'm not saying pine straw mulch is perfect. Obviously, I have not had it long enough to know how it will perform over time. Will it do a good job of suppressing weeds? The bar is pretty low here since the (admittedly somewhat thin levels of) bark mulches did not seem to suppress weeds at all.

Will the pine straw decompose so quickly that it becomes cost prohibitive to keep the beds properly mulched? One nursery worker who unfortunately convinced me not to buy pine straw mulch a year ago (probably because his nursery didn't carry it) told me that pine straw mulch decomposed too quickly to be useful. But then he told me the mulch would blow and wash away, which it clearly has not. And one of our neighbors (from the Carolinas, where pine straw mulch is apparently very common) has had pine straw mulch installed for a year now and seem to have excellent weed suppression and the mulch seems to have persisted just fine.

I anticipate that I'll need to add some additional pine straw mulch - perhaps another six bales - to get good coverage over the rest of my beds and deepen the mulch a little on the beds I've already mulched. After that, I'm thinking I really won't mind freshening up and adding to the mulch ever year or two with another six or so bales. Really doesn't seem unreasonable to me.

The one concern I have - which sounded sensible to me when my landscaper mentioned it - is that small perennials and groundcovers can get lost in a pine straw mulch. I can see how that could be an issue, but it doesn't seem like much of a hardship to just keep the pine straw pulled back from those smaller plants. And if the pine straw covers up some of the really low groundcovers - like Blue Star Creeper - well that means that theoretically it's also smothering a lot of low-growing weeds. And that's a trade-off I'm willing to make, considering I mainly grew the Blue Star Creeper to outcompete the weeds. Anyway, I don't think that the larger perennials - and by large, I mean even those that are 4-6 inches high like Sweet Woodruff or Rozanne Perennial Geranium - will have any trouble holding their own against the pine straw mulch. Time will tell.

Other issues? I'm a little concerned that pine straw mulch could be a welcoming environment for the pygmy rattlesnake. One commentator on GardenWeb suggested stomping or hitting the ground with a rake to warn off snakes and give them time to slither off. I suppose I should also invest in some gardening boots that cover my lower legs.

I'm also still interested in using a variety of ground covers instead of or in addition to mulch, but ground covers take time to fill in, so I think the mulch will be very welcome at least in the short-term.

Oh and some people are either concerned or excited about the supposed ability of pine needles to add a bit of acidity to the soil. Not sure whether this idea really holds water. In any case, I do have some acid-loving plants like camellias, azaleas and a gardenia in the front bed who will probably be very happy if the pine straw mulch acidifies the soil even a little bit.

There are many other mulch options that I did not touch on above, most of which I've investigated and then discarded for one reason or another. I'll run through them very briefly here:

- Stone and gravel mulches -- Many people who have gone this route express dismay and regret in online message boards. Apparently, dust and dirt blows on top of the stone and gravel, creating a growing medium in which weeds can sprout. People also seem to think it's hard to add plants (bushes, perennials, etc.) into the stone mulches. Plus of course, the stones don't add any organic matter to the soil.

- Leaf mulch - Well, I don't have nearly enough leaves to do this, for one thing. I did try to rake leaves from my crape myrtles and maple into my garden beds, but those will decompose so quickly that they won't provide weed suppression benefits. Plus leaves have a tendency to blow away. And then there are leaves like oak leaves that take forever to decompose. I've got some sitting in a small bed by the mailbox that are still there from last autumn, so maybe 15 months now. And they don't look like they're about to decompose anytime soon. Don't look that attractive either, to my eyes. So I'm all for leaf mulch on occasion and in the right place or added to a compost pile perhaps, but I don't think it's a realistic long-term mulch solution for many people.

- Wheat straw mulch - Worried about the straw itself sprouting, which would sort of go against the whole weed suppression thing. Plus I'm not sure how I would feel about this aesthetically, although I could see it working in a veggie garden.

- Cocoa shell mulch - Interesting. Exotic. Might smell like chocolate, which I think sounds intriguing. But the smell apparently fades quickly - which happened with some cedar mulch I spread a while ago - and the mulch is supposedly so light and fluffy that it blows and washes away easily. (Although they said that about pine needles too.) And then there's the fact that cocoa mulch could be hazardous to canines. Oh yeah, and the fact that I've never seen cocoa shell mulch ever in any local nursery or garden supply store. And wouldn't the shells need to be shipped in from a tropical climate where cocoa beans are grown. That doesn't sound very eco. Unless the beans were shipped to the local area anyway for processing in which case I guess using the shells for mulch would just be creative reuse of something that would otherwise be treated as a waste product.

- Rubber mulch - Does not improve the soil and um, I think it's mainly made from used tires. Ugh. Don't want that anywhere near my veggies and certainly wouldn't want children playing on it.

- Cover crop mulch - One idea that I'd like to try in the long term would be growing a cover crop like Buckwheat or Alfalfa in the garden and then taking the chopped or winterkilled tops and trying to use them as a mulch. But I'm guessing they would decompose too fast to use as a real mulch and that they would function better as a so-called green manure. Incidentally, buckwheat hulls are an interesting mulch option, but as Cornell notes, they're typically very expensive compared to other mulches and prone to blowing. So I guess probably only a good option for millionaires with good windbreaks! ;-)  But I like the idea of growing your own mulch rather than relying on store-bought mulch. Even pine straw after all has to be gathered, baled and shipped. Homegrown mulch certainly sounds more eco-friendly. Here's one guy who took this path-less-traveled and tried to grow his own mulch using oats.

Of course, planting pine trees on my own property - or finding a neighbor looking with pine trees looking to get rid of excess needles - might also be a good sustainable, local and cost-effective approach to mulching...

What do you think about pine straw mulch? Has this post convinced you to give it a try? Or are you already a pine straw mulcher? Or do you prefer to use groundcovers vs. mulch?

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