- Name: Black Fountain Grass - Other Common Names: Dwarf Black Fountain Grasss - Scientific Name: Pennisetum Alopecuroides Var. Viridescens - Color: Deep Purple - Black Plumes - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Plant Height: 18 - 24" - Plant Spacing: 24" - Bloom Time: Late Summer - Hardiness Zone: 5 – 9 - Light Requirements: Sun (Part Sun) - Soil & Water Preferences: Average - Quantity: 10 Seeds