- You will get 251+ Seeds of China Aster Powder Puff Mix Flower Seeds. - Seller Notes: “Callistephus chinensis (powder puff mix) U.S. Grown Seed. Tested 1/23-Germination 93%. Packed 1/23.”. - Planting Time: 9 Weeks. - Soil Type: Clay, Loam, Peat, Sand. - Life Cycle: Annual. - USDA Hardiness Zone (°F): 11 (40 to 50 °F). - Soil pH: Neutral. - Watering: Medium. - Sunlight: Partial Shade, Full Sun. - China Aster "Powder Puff" mix. China Aster is one of the most popular long lasting, cut flowers available. Easy to grow from seed. The big blooms are about 3" across and make excellent cut flowers. They get about 24"tall. This mix comes in pastel colors of rose, purple, pink and lavenders with bright yellow centers. Blooms from early summer into fall. Garden or patio container.250+ seeds per order. Thank You!. - Callistephus chinensis (powder puff mix). - Annual. - Early spring. Soil temp 68F+. - Full sun/Partial sun. - SOW-3 or 4 seeds per plant,1/4"deep,12"apart. Keep moist. - Germination 7-14 Days. - Medium water. Light fertilizer if needed. - Flowers are mixed. Blooms mid-summer through late fall.