Sweet Pea, Royal Family Mix (Lathyrus odoratus) Seed grow to display a delightful array of colors in this stunning mixture. It is an annual growing flower and it originates from Europe. It grows with direct sunlight which is approximately 6 hours per day and half shade which can be up to 4 hours per day. The mature height is 6-10 feet tall. It takes 10-21 days to mature and grows in average or well-drained soil. It will not tolerate sandy soil, loamy soil and clay soil. The users for this beautiful flower are hummingbirds and butterflies, fragrant, showy flowers and extended bloomers.