Japanese Knotweed (Fallopia japonica) is another wild edible plant ripe for picking. I gather young shoots when they are about a foot tall. I act fast when I find this rapidly growing plant emerging -- stalks can grow several feet in just a few weeks! This past week, I picked and froze 5 quarts of young shoots. Cooked until soft and mushy, these shoots can be combined with fruit for a tasty sauce.