- You Will Get 500 Seeds Of Derby Timothy Grass Ornamental Phleum Pratense Seeds. - Description: - Name: Derby Timothy Grass. - Scientific Name: Phleum Pratense. - Color: Green. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 18 - 24". - Plant Spacing: 12 - 15". - Bloom Time: Summer. - Hardiness Zone: 4 – 10. - Light Requirements: Sun - Part Shade. - Soil & Water Preferences: Average.