- You will get 300+ Seeds of Giant California China Aster Mix Flower Seeds. - Seller Notes “Callistephus chinensis. 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. - Giant California / China Aster Singles mix. California / China Aster is one of the most popular long lasting, cut flowers available. Easy to grow from seed. The single blooms are about 3" across and resemble chrysanthemums. They get about 24"tall. This mix comes in pastel colors of reds, pinks, blues and lavenders with bright yellow centers. Blooms from early summer into fall. Garden or patio container. 300+ seeds per order. Thank You!. - Callistephus chinensis. - 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.