Sea Holly Seeds produce perennial flowering plants known for their spiky flower heads and silvery-blue foliage. These hardy plants thrive in full sun and well drained soils, making them suitable for garden borders, rock gardens, and container cultivation. They are drought tolerant, attract pollinators, and provide structural and seasonal interest in ornamental landscapes.
Features
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Perennial flowering plant with spiky blue or silvery flowers
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Drought tolerant and hardy
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Suitable for garden borders, rock gardens, and containers
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Attracts pollinators such as bees and butterflies
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Adds architectural and seasonal interest to gardens
Specifications
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Scientific Name: Eryngium spp.
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Common Name (US): Sea Holly
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Seed Type / Variety: Ornamental blue flowering variety
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Growth Habit: Upright perennial flowering plant
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USDA Zones: 4–9
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Planting Season: Spring
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Growing Season: Late spring through fall
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Sowing Season: February–April indoors; transplant after frost
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Germination Time and Conditions: 14–21 days; light, well drained soil at 65–70°F
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Sunlight Requirements: Full sun
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Soil Requirements: Well drained moderately fertile soil
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Watering Needs: Low to moderate; drought tolerant once established
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Mature Plant Size: 18–36 inches height; 12–18 inches spread
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Plant Spacing: 12–18 inches apart