- You Will Get 20 Seeds Of Cinderella Milkweed Asclepias Incarnata Flower Seeds. - Description: - Name: Cinderella Milkweed. - Other Common Names: Butterfly Weed / Butterfly Milkweed / Orange Glory Flower. - Scientific Name: Asclepias Incarnata. - Color: Magenta (Pink-Purple). - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 24 - 48". - Plant Spacing: 18 - 24". - Bloom Time: Mid Summer - Early Fall. - Hardiness Zone: 3 – 10. - Light Requirements: Sun. - Soil & Water Preferences: Average.