- You Will Get 200 Seeds Of White Pampas Grass Cortaderia Selloana Ornamental Flower Seeds. - Description: - Name: White Pampas Grass. - Scientific Name: Cortaderia Selloana. - Color: White. - Plant Seeds: When Soil Temp Warms To 70f. - Bloom Time: Late Summer. - Hardiness Zone: 7 – 10. - Plant Height: 96 - 144". - Plant Spacing: 24 – 36”. - Light Requirements: Sun – Part Shade. - Soil & Water Preferences: Average – Dry.