- You Will Get 10 Seeds Of Yellow Double Begonia Tuberosa Tuberous Begonia Shade Flower Seeds. - Description: - Name: Yellow Double Begonia. - Other Common Names: Double Tuberous Begonia. - Scientific Name: Begonia Tuberosa Double. - Color: Yellow. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 12". - Plant Spacing: 9 - 12". - Bloom Time: Spring – Fall. - Hardiness Zone: 9 - 11, Or As An Annual. - Light Requirements: Part - Full Shade. - Soil & Water Preferences: Average.