- Name: Stemless Gentian - Other Common Names: Gentiana Kochiana - Scientific Name: Gentiana Acaulis - Color: Blue With Olive Green Throats - A Stunning Combination! - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost / Cold Stratify - Bloom Time: Late Spring - Summer - Hardiness Zone: 3 - 9 - Plant Height: 4" - Plant Spacing: 8 - 10" - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Quantity: 15 Seeds - Other: Attracts Butterflies & Bees! The Flowers Of The Stemless Gentian Truly Are Stemless. This Gentian Has Evergreen Leaves.