I only plant things in my garden that are very hardy and come up every year without fail. If it fails, I don't replace it. Sometimes I will grow things from seed, like zinnias-they are pretty affordable and sometimes I even save seeds. Some things I love that seed freely are cosmos and parillas. I also have a red columbine that seeds well. These are pretty things that I know will be in my garden forever (read-invasive by some people's standards, hardy by mine) I also had some black eyed susan flowers I dug up in my back fence line, and they grew like crazy for me. Joe Pye Weed seeded well for me, but I don't remember what variety I had.
