Mary - Them green tomatoe things growing on your poatoe plant are a new breed of potatoe plant, i read anarticle on tmen a while back. Im not sure if the tomatoes them selves are edible, actually i doubt they will be but it shouldnt affect you poatoes at all. Sorry but i cant for the life in me remember what the name of the potatoe plant is, sorry. Hopw this helps.