There is a lot of wild greens that monsatan has labelled "weeds" so we have to buy the herbicides they sell us, and spray them, and then buy the seeds they sell us to plant that will grow inspite of their poison.
Anyway depending on where you are I can tell you what you can get free and its very very good, if you find it in soil that's not been herbicided to oblivion.
The toxic crap they spray turns these awesome plants black and charred. And the clueless idiots think that's good. I am very very fortunate to have a few acres that hasn't been weed sprayed for 20 yrs. I've not bought anything other than broccoli for almost a year.
Let me know I may be able to tell you.