Achillea ptarmica 'The Pearl' is a double-flowered form of sneezewort, a British native wild flower. From June to August it carries loose sprays of small, pure white, pompom flowers above narrow, finely toothed, dark green leaves.

'The Pearl' at a glance

Botanical name Achillea ptarmica 'The Pearl'
Common name Sneezewort
Plant type Clump-forming perennial; dies back in winter
Height and spread About 90 cm–1 m tall, 50–100 cm wide
Flowers Pure white double pompoms in loose sprays, June to August
Position Full sun or part shade
Soil Moist but well-drained soil; not waterlogged
Pond depth None – moist border, not wet ground or water
Hardiness RHS H7 – very hardy (below -20°C)
Native to Garden form of the UK native sneezewort

Is 'The Pearl' a bog plant?

No. It needs more moisture than most achilleas, but the RHS says it must not be waterlogged, and it suffers in very wet winters. Grow it in a moist but well-drained border near a pond, not in a bog garden or at the water's edge.

Is it good for wildlife?

Yes. It is on the RHS Plants for Pollinators list, and birds eat the seed heads.

How to plant and care for it

Plant in spring in sun or part shade. It spreads vigorously, so give it room, and stake it in exposed spots. Watch for aphids and powdery mildew.

Which size should I buy?

Bare-root plants (7 cm, 9 cm, 1 litre and 3 litre) arrive without a pot or compost and are the most economical way to plant a group. Potted plants (9 cm, 1 litre and 3 litre) arrive growing in our peat-free compost and give a faster display. Packs of 3 come in 7 cm, 9 cm, 1 litre and 3 litre bare-root sizes and cost less per plant. The 2x Pot & Compost option is two plants supplied with pots and compost.

Pond depth: 0cm

Light: Full sun or part shade

Hardiness: Hardy

Height and spread: 80 - 120cm tall, 50 - 100cm wide

Planting and flowering months are shown in the calendar under the photos.

Bare root (7 cm, 9 cm, 1 litre, 3 litre): plants sent without a pot or compost, ready to plant straight away. The most economical way to plant a group.

Potted (9 cm, 1 litre, 3 litre): plants growing in our recycled, peat-free compost made in Lincolnshire. Larger sizes give a faster display.

Pack of 3 (7 cm bare-root, 9 cm bare-root, 1 litre bare-root, 3 litre bare-root): three plants of the chosen size at a lower price per plant.

2x Pot & Compost: two plants supplied with pots and compost.

Sizes shown with a line through them are currently unavailable.

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