Peter Cottontail is a sneezewort-type yarrow with a softer, airier look than the common flat-topped kinds. Instead of dense plates, it carries loose sprays of rounded, ivory white flowers that read almost like baby's breath from a distance.
It grows as a low, polished mound under two feet tall and blooms for a long stretch from early summer into early fall. It suits edging, containers, rock gardens and cottage borders, and the flowers work well cut or dried. It handles sun or part shade and is seldom bothered by deer or rabbits.
What it looks like
Loose, open sprays of rounded, fully double ivory white flowers, each about half an inch across, with a button-like, ruffled center. The flowers are spaced apart in airy clusters rather than packed plates. Leaves are narrow, lance-shaped, green and finely toothed, 2 to 3 inches long. The plant forms a low, tidy, mounded clump 18 to 24 inches tall and 28 to 30 inches wide. At peak bloom the mound is dotted all over with small white pom-pom flowers.
Growing it with lavender
Peter Cottontail likes the same sunny, well-drained ground as lavender, and its airy white sprays soften the edges of a lavender planting and fill gaps as lavender finishes its first bloom.
Care
Grow in full sun to part shade in average, well-drained soil; it tolerates dry spells once established. Hardy in USDA zones 3-8. Deadhead or lightly shear faded sprays to keep flowers coming into fall.
At a glance
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Botanical name: Achillea ptarmica
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Flower color: Ivory white
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Foliage: Green
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Growth habit: Low, rounded mound
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Mature size: 18–24 in tall × 28–30 in wide
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USDA hardiness zones: 3–8
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Light: full sun, part sun to part shade
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Bloom start: Mid-June
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Peak bloom: Mid-July
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Bloom pattern: Long Blooming
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Deer resistance: Resistant
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Pollinator value: Great
Sizes and shipping
Dormant bare-root plant, sold in boxes of 25 per variety (order in multiples of 25). Bare-root plants ship or are picked up March 1–May 31 only. They are soil-free, so they may ship to every state in that window. Dormant plants often show little or no top growth on arrival; plant or heel them in promptly.