Every day, I count my lucky stars when I go into the garden and see the buzzing bumblebees in the partridge peas (Chamaecrista fasciculata).
I started with just a few partridge pea seeds - from Kansas Native Plants, I think - and now I have more partridge pea plants than I could count. They do self-seed with abandon, but it's easy to pull any excess volunteers and they're so beautiful and helpful to beneficial insects that I love them regardless.