- You Will Get 500 Seeds Of Bulk Hardy Begonia Grandis Rose Pink Perennial Sun - Shade Flower Seeds. - Description: - Name: Hardy Begonia. - Scientific Name: Begonia Grandis. - Color: Rose Pink. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 12- 24". - Plant Spacing: 12 - 15". - Bloom Time: July – Oct. - Hardiness Zone: 5 – 9. - Light Requirements: Sun - Shade ... These Can Grow In Full Sun If It Is Not Overwhelming. In Places With Extreme Heat & Sun, You Will Want To Give Them Part Shade. - Soil & Water Preferences: Average.