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100+ Mixed Sea Holly Seeds Alpine Sea Holly Seeds Eryngium alpinum Heirloom Perennial Flowers for Garden Borders Blue Silver Blooms

-8% $ 6 .90 $7.50
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Description
Planting guide for Alpine Sea Holly (Eryngium alpinum) Seeds: 1. Cold Stratification Required: Seeds require a period of cold, moist stratification to break dormancy. Place seeds in a moist paper towel or sand inside a sealed bag and refrigerate for 4–6 weeks at 35–40°F (1–4°C). 2. When to Plant: After stratification, sow seeds indoors in late winter, or direct sow outdoors in early spring after the last frost. Alternatively, sow in fall for natural cold exposure and spring germination. 3. Sunlight Requirement: Choose a location with full sun; Alpine Sea Holly thrives in bright, direct light and will produce the most intense blue coloration. 4. Sowing Depth: Plant seeds ⅛ to ¼ inch deep and cover very lightly with fine, well-draining soil or sand. 5. Spacing: Thin seedlings or space plants 12–18 inches apart to allow for mature clump growth and good air circulation. 6. Soil Requirements: Requires sharp drainage; thrives in sandy, gravelly, or rocky soil with low fertility. Does not tolerate wet, heavy clay soils. 7. Watering: Keep soil lightly moist until germination (germination can be slow and erratic, taking 2–8 weeks). Once established, water sparingly as plants are highly drought-tolerant. 8. Maintenance: Avoid fertilizing, as rich soil promotes floppy growth. Cut back spent flower stems in late winter to encourage fresh new growth.
Striking Steel-Blue Blooms: Produces unique, thistle-like flower heads surrounded by intricate, spiky bracts in an intense metallic blue that adds architectural drama to any garden.
Excellent for Cutting & Drying: The stunning blue flowers hold their color and form beautifully when cut for fresh bouquets or dried for everlasting arrangements.
Drought-Tolerant & Hardy: Once established, thrives in hot, dry conditions and poor, sandy soils, making it ideal for xeriscaping and low-maintenance gardens.
Pollinator Magnet: The unusual, nectar-rich blooms attract bees, butterflies, and beneficial insects while remaining deer and rabbit resistant.
Architectural Garden Accent: Perfect for adding striking texture and vertical interest to rock gardens, borders, and coastal landscapes with its sculptural form.

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