- Name: Black Knight Pacific Giant Delphinium - Other Common Names: Larkspur - Scientific Name: Delphinium Elatum / Delphinium Cultorum - Color: Black (Dark Violet Blue With Black Centers) - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost / Fall - Bloom Time: Summer - Hardiness Zone: 3 - 8 - Plant Height: 70” - Plant Spacing: 30” - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 50 Seeds - Other: Delphinium Flowers Attract Bees, Butterflies, And Birds Including Hummingbirds!. The Tall, Stunning Flower Spikes Of Black Knight Are Real Show-Stoppers And Are Sure To Please! They Are Also Deer Resistant.