- You Will Get 100 Seeds Of Yucca Glauca (Soapweed, Soapwell, Beargrass, Great Plains Yucca) Flower Seeds. - Description: - Name: Yucca. - Other Common Names: Soapweed / Soapwell / Beargrass / Great Plains Yucca. - Scientific Name: Yucca Glauca. - Color: White Bell Shaped Flowers With A Hint Of Pink. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 24 - 48". - Plant Spacing: 24 - 48". - Bloom Time: Spring. - Hardiness Zone: 4 – 10. - Light Requirements: Sun. - Soil & Water Preferences: Dry.