I might be one of the last people to realize this phenomenon, but I just started regrowing my green onions. My first batch got kind of gross because I didn't change the water every day, but my second batch turned out great. I didn't really need them when they had reached about 12 inches, so I just chopped them and put them in the freezer because I read you could do that. (??) I will report back when I find out if it works and they taste good.