Sweet William Mix Dianthus barbatus Description Biennial. Blooms in the second year. Self-seeding.Blooms fragrant, large clusters of red, rose and pink flowers. Bloom Period: June into JulyGrowth Habit: Dense and rounded Mature Height: 10” (25cm)Mature Spread: 8” (20cm)Growth Rate: Moderate More Details Sun Exposure: Full sunCold Hardiness Zone: 3Drought and heat tolerantAttracts bees, butterflies and hummingbirdsCut flowerLandscape Uses: Border/edging