Double Diamond Achillea is a hardy perennial flower that brings reliable summer color to northern gardens, thriving even in zones as cold as 3. This cultivar of Achillea ptarmica grows to a compact 30 inches tall and spreads about 24 inches wide, making it manageable in mixed borders and cottage gardens. Its airy, delicate blooms arrive in June through August, attracting pollinators while brushing off the attention of deer. Once established, it tolerates drought well and demands only moderate water, yet it shows no major pest or disease issues when grown in appropriate conditions.
1
Full Sun
Moderate
3-3
30in H x 24in W
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High
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Double Diamond produces refined, light summer flowers on compact plants that never get leggy or overwhelming. Gardeners appreciate its hands-off nature; it thrives in full sun with minimal fussing, tolerates cold winters without complaint, and resists the deer browsing that ruins so many perennials. The trick to keeping it tidy is avoiding overfertilizing, which pushes lush green growth at the expense of blooms and structure.
Double Diamond Achillea is grown primarily as an ornamental flower for summer gardens. Its airy blooms work well in mixed borders, cottage gardens, and pollinator plantings where its delicate texture creates visual interest without overwhelming neighboring plants.
No timeline data available yet for this variety.
Sow seeds 8 to 10 weeks before your last frost date. Surface sow the tiny seeds and press them in lightly; they need light to germinate. Keep the soil around 70°F until sprouts emerge in 7 to 21 days, then lower the temperature to 60 to 65°F to encourage stocky growth. Transplant seedlings outdoors after your last frost date once they are hardened off.
Transplant seedlings outdoors after your last frost date. Harden off plants by gradually exposing them to outdoor conditions over 7 to 10 days before planting in the garden.
Direct sow seeds at your last frost date through early summer. Surface sow and press seeds in lightly, then keep the soil consistently moist until seedlings emerge.
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