- You Will Get 250 Seeds Of Detroit Dark Red Beet Heirloom Beta Vulgaris Vegetable Seeds. - Description: - Name: Detroit Dark Red Beet. - Scientific Name: Beta Vulgaris. - Color: Deep Red. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Harvest: 55 Days. - Hardiness Zone: Annual. - Plant Height: 12 - 18". - Plant Spacing: 2 - 4". - Light Requirements: Sun. - Soil & Water Preferences: Average.