QuestionsHow to growFlowersBorder Perennial Flowerssweet pea 0 Vote Up Vote Down Annette Hollywood asked 16 years ago what is the name of the sweet pea that comes back year after year? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 8 years ago There are a few perennial species, notably Lathyrus latifolius and Lathyrus grandiflorus