Seymour is a young orphan working in Mushnik's floral shop, down on his luck and in love with the girl who's dating an abusive, sociopathic dentist. One day, he comes upon a strange and unusual plant and quickly learns that growing this bloodthirsty vegetable is more than he bargained for. Suddenly, Seymour is an overnight celebrity, but not without a couple of dirty little secrets he has to hide.