Achillea 'Peter Cottontail'

Achillea ptarmica ‘Peter Cottontail’: Ivory Pompons for a Light, Lacy Summer

Airy, bright, and delightfully different from flat-topped yarrow, Achillea ptarmica ‘Peter Cottontail’ sends up rounded clusters of ivory-white flowers that look a little like baby’s breath—only sturdier, longer-blooming, and made for the sunny border. The softly mounded habit stays polished, while the deep green, narrow foliage brings fine texture without looking fussy. A favourite with bees and butterflies and a standout for fresh or dried bouquets, this cultivar offers a long season of crisp white bloom with impressive garden reliability.

Plant Characteristics:

• Height: 45–60 cm
• Spread: 70–75 cm; low, mounded habit with a gently spreading, rhizomatous nature
• Flower Colour: Ivory to creamy white; rounded, button-like clusters
• Flowering Period: Early summer into early fall (best repeat when deadheaded)
• Foliage: Narrow, lance-shaped, deep green leaves; lightly aromatic, tidy and refined
• Sunlight Requirements: Full sun to part shade
• Soil Requirements: Well-drained soil; prefers average to lean conditions and tolerates dry-to-medium moisture once established

Uses and Benefits: ‘Peter Cottontail’ is a perfect “lightener” for sunny borders—threading clean white bloom through stronger colours and adding a soft, floating texture that keeps plantings feeling fresh. It shines in cottage gardens, pollinator borders, gravel-style plantings, and modern naturalistic designs, and it performs beautifully as an edging or mid-border perennial where its mounded form reads as calm structure. The long-lasting flowers are excellent for cutting (fresh or dried), and the plant is noted for being unappealing to deer and rabbits in many gardens.

Companion Plants: Pair the airy ivory bloom of Achillea ptarmica ‘Peter Cottontail’ with Nepeta ‘Walker’s Low’ for a relaxed drift of lavender-blue and aromatic foliage at its feet. Add Salvia nemorosa ‘Caradonna’ for sleek, upright violet spires that bring definition and depth. Finish with Echinacea ‘PowWow White’ to echo the white palette while adding bold daisy form and late-season presence.

Care Instructions: Grow in full sun for the strongest stems and heaviest flowering, though a little afternoon shade is welcome in hotter sites. Plant in well-drained soil and avoid rich, heavily amended beds, which can encourage softer growth; water to establish, then provide occasional moisture during extended drought. Deadhead regularly to extend bloom and keep the plant looking crisp, and shear lightly after the main flush for a refreshed, reblooming habit. Divide every 2–3 years in spring (or early fall) to maintain vigour and keep spreading neatly in bounds.

History: Achillea ptarmica (sneezewort) is native to Europe and western Asia and is known for its summer-long display of small white flower heads and its adaptability in gardens. ‘Peter Cottontail’ is a patented cultivar (PP31,756) bred from controlled crosses made in 2014 and selected for its dense, mounded habit, heavily branched stems, and a long flowering period that begins in mid-June. The cultivar was introduced through Walters Gardens, with the patent granted in 2020, cementing its place as a modern refinement of this classic, cottage-garden species.

Final Thoughts: If you want a white bloomer that feels light as lace but performs like a workhorse, Achillea ptarmica ‘Peter Cottontail’ delivers—brightening borders for months, feeding pollinators, and filling vases with easy summer charm.