MamaTamba, it's "Poke Salad Annie", from the Southern plant pokeweed. There's an herbal site here to give you a picture. The stuff is noxious - birds love the berries, but once it gets into your garden, it's real hard to get rid of.

Web references say the song was written by Tony Joe White, but for the life of me, I can't remember if it was him or a group that made it a hit. I tend to get it mixed up in my head with "Mustang Sally"....

Hope this helps!