- Name: Blue Star Sea Holly - Scientific Name: Eryngium - Color: Lilac / Lavender - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Bloom Time: Mid Summer - Early Fall - Hardiness Zone: 2 - 8 - Plant Height: 36 - 48” - Plant Spacing: 18 - 24” - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 25 Seeds - Other: Blue Star Sea Holly Features Stunning Blue Flowers That Attract Bees &Amp; Butterflies. These Rugged Plants Tolerate Poor Soils, Salt, Sand, And Full Sun. The Thistle-Like Feathery Foliage Is Deer &Amp; Rabbit Resistant. Leave Them Over Winter For Year-Round Interest, Or Cut A Few - They Make An Excellent Cut Or Dried Flowers! Add A Unique Flair To Your Flower Garden With Blue Star Sea Holly!