- Name: Powder Puff Aster Mix - Scientific Name: Callistephus Chinensis - Color: White, Pink, Peach, Rose, Red, Scarlet, Blue, & Purple All With Yellow Centers - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Bloom Time: Summer - Hardiness Zone: 5 - 10 - Plant Height: 12 - 24" - Plant Spacing: 12 - 15" - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Quantity: 1000 Seeds - Other: The Huge, Fully Double 3” Flowers Of The Powderpuff Aster Mix Comes In A Most Amazing Variety Of Colors! These Italian Natives Make An Excellent Cut Flower Because Of Their Strong Stems And Are A Favorite Of Florists. Bees And Butterflies Love Asters Too!