You have probably heard people use the "sweet peas" term incorrectly. In garden terminology, sweet peas are flowers. They are not edible and are poisonous. Edible peas, even if sweet in taste, are not correctly called sweet peas. Sweet peas are incredibly fragrant vining flowers that come in a variety of colors, mostly pastels. They are an annual flower so they must be planted again every year. You can sow seeds anytime during the winter for spring bloom. The seeds are hard and it can be helpful to nick them slightly before putting them in the ground. Sweet peas do best in full sun or light shade. The plants will decline when it gets hot outside and they will need to be removed. Remember, you cannot eat sweet peas.