When I fertilize it only seems the weeds get bigger and wilder, so most of the time I use what little compost I have and spoil a few of my most precious (or what looks in desperate need!). Then I end up with tomato volunteers mixing in with my lilies (yes, the ever compostable canning tomato season in for another round).
Weeds, now I could hybridize those. I have all kinds and all cultivars and they pollinate each other, so protecting the crosses might be tricky.
Seriously though! When I saw burdock root at the Farmer's Market for $4/ lb, I thought I would die. I could easily make a living here. I never knew that is was so precious! Sheesh.