- You Will Get 30 Seeds Of Incredible Dwarf Sunflower Helianthus Annuus Flower Seeds. - Description: - Name: Incredible Dwarf Sunflower. - Scientific Name: Helianthus Annuus. - Color: 10" Yellow Flowers With Brown Centers. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 15 - 20". - Plant Spacing: 9 - 12". - Bloom Time: Late Summer – Fall. - Hardiness Zone: N/A. - Light Requirements: Sun. - Soil & Water Preferences: Average.