Favorite semi-tropical plants for knfFood

Pick something that is fast growing ,not poisonous, and readily avaliable. I'm not in a semitropical environment, but one of my favorites it comphrey. I also use nettle ,yarrow,thistle, dandelions. I use an assortment of fruits  later on in plants life. during its reproduction phase.play around do your research and find out what nutrients each plant contains.