Blue Glitter Sea Holly is a striking cultivar of Eryngium planum that brings an ethereal, shimmering quality to summer and fall gardens. This hardy perennial reaches 24 to 36 inches tall with a compact 30-inch spread, producing delicate, jewel-toned flowers that seem to sparkle in full sun. It thrives in zones 5 through 5 with minimal water once established, making it a resilient choice for gardeners seeking drama without fuss. Deer and drought cannot touch it, and it magnetizes pollinators throughout the warm months from June through November.
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Full Sun
Low
5-5
36in H x 30in W
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Low
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Blue Glitter Sea Holly displays an otherworldly shimmer that catches the light like no other sea holly, creating a magical effect in the garden throughout the extended summer and fall season. The plant's extreme hardiness in zone 5, combined with its low water needs and deer resistance, means you can place it in challenging spots where other ornamentals struggle. It attracts pollinators abundantly while requiring virtually no maintenance once settled into the garden.
Blue Glitter Sea Holly is grown as an ornamental flower for borders, cottage gardens, and mixed perennial beds where its airy texture and luminous color create visual interest without overwhelming neighboring plants. Its long blooming season and persistent structure make it valuable for cutting gardens and dried flower arrangements.
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Start seeds indoors 10 to 16 weeks before your last spring frost. Surface sow the seeds, as they require light for germination. Maintain soil temperature between 70 and 75 degrees Fahrenheit until sprouts emerge, which typically occurs within 7 to 28 days. Once germinated, drop the temperature to 55 to 60 degrees Fahrenheit. If germination hasn't occurred after four weeks, cover the pots with plastic and refrigerate for about four weeks, then return them to warmth to break dormancy. Bottom water or mist seeds carefully to avoid covering them, as light is essential.
Harden off seedlings gradually by exposing them to outdoor conditions over 7 to 10 days before transplanting. Move them into the garden after the last frost date when soil has warmed. Space plants 1 inch apart at transplanting, allowing for their mature 30-inch spread.
Direct sow in fall or earliest spring, or use winter sowing by sowing into pots in the shade during winter months.
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