Way back then, 1960- 1970s, I read a lot of Euell Gibbons and Boy Scout manual stuff on survival and wild edibles, wild plant utility, etc. My brothers had a very dedicated scout master who believed in getting them to know their environment and make use of what was at hand. They did tons of wilderness camping. One made it to Eagle and beyond.
Anyhow, I probably read about eating the wild onions from Gibbons, and got confirmation from Scout Master X. If you want to get more information on these wild edibles, I'd suggest finding some of these old books to read. Bradford Angiers, Euell Gibbons, Billy Joe Tatum, are some of the older ones. Steve Brill, Deane Jordan and many others are contemporary sources who may not have books, but have apps or sites. There are a lot of flaky types out there who think they know what they are talking about but really don't, and a lot of pseudo-survival advice that is garbage. Cross check your references, and triple check your ID.