Lathyrus odoratus. Direct sow Spencer Ripple Mix sweet pea seeds as early as March in coastal gardens. Vines grow 2-2.5m (6-8′) tall and will climb up any vertical trellis. Spencer Ripple Mix produces strongly fragrant flowers with the classical Spencer shape – ruffled standard petals, with extra long wing petals. They are just showier than other sweet peas and they make great cut flowers as a result. Bicolour flowers with picotee edges set beautiful pastels against a nearly white background. Expect purple, blue, red, and pink blooms. Spencer types perform better in cool weather, and are among the last sweet peas to bloom.