91-105 days. Powderpuff Mix Aster flower seeds are a tidy and vibrant addition to grow in any home or garden. Powderpuff Mix flowers grow robust 12-36" tall Asters perfect for indoor gardening, yet hardy enough to keep outside during the long summer heat. Powderpuff Mix Aster flower seeds promise dazzling 3-5" lush mum-like bulbs that are sure to highlight any seasonal fresh cut arrangement or bouquet. Aster is tolerant, easy to grow from seeds, and ideal for indoor containers and planters or for a charming border around your flower bed. 1000 seeds.