Does it need full sun?

Yes, it performs best in full sun but will tolerate partial shade.

It can be vigorous and spread quickly, so monitor it in smaller garden beds.

Plant guide

Sneezewort.

Achillea ptarmica

Pronounced uh-KILL-ee-uh TAR-mih-kuh

Also known as Sneezeweed, Sneezewort

Sneezewort is a lovely perennial that brings a soft, airy feel to any garden bed. It produces clusters of small, white, button-like flowers that look great all summer long. You'll find it's quite hardy and spreads nicely to fill in empty spots.

Another photo of Sneezewort — Photo by saer (CC BY) via gbif

At a glance

Care level: Easy
Plant type: Perennial
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 3 to 7 days
Mature size: 2 feet tall
Growth rate: Fast
Hardiness: USDA 3 to 9
Bloom time: Early to late summer

Care

Keep the soil consistently moist, as this plant prefers wetter conditions than other yarrows. Watch for aphids during the warmer months and trim back spent blooms to encourage a second flush of flowers. It's a vigorous grower, so keep an eye on it if you have limited space.

Watering: Keep the soil consistently moist but never waterlogged.
Feeding: Apply a balanced liquid fertilizer once every two months during the growing season.
Pruning: Deadhead spent flowers regularly to promote continuous blooming.
Repotting: Divide the plant every few years to maintain vigor and prevent overcrowding.
Soil: Moist, well-draining soil
Soil pH: Neutral to slightly acidic
Temperature: -30 to 30°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Perennial, typically 5 to 10 years.
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes
Water running straight through the pot
Stunted growth during the active season

Safety

People: The plant is generally considered non-toxic but may cause mild skin irritation in sensitive individuals.
Pets: This plant is considered mildly toxic to cats and dogs. Eating it may cause vomiting, diarrhea and drooling.
Children: Keep away from small children as the foliage can be irritating if handled frequently.
Contact allergens: The foliage can cause contact dermatitis in some people due to sesquiterpene lactones.
Airborne allergens: Pollen may trigger mild allergic reactions in those sensitive to Asteraceae family plants.
Edibility: This plant is not considered edible and should be avoided for consumption.

How to identify it

Clusters of small white flowers
Serrated, lance-shaped green leaves
Stems grow upright and branched
Button-like flower heads

Height: 0.3 to 0.75m
Spread: 0.3 to 0.6m
Leaves: green, deciduous
Flowers: white, 1 to 2cm

Problems to watch for

Powdery mildew · A white fungal coating appears on leaves during periods of high humidity and poor airflow.
Aphids · Small insects that cluster on new growth and flower buds.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed, cuttings
When to plant: spring, autumn
Overwintering: Cut the foliage back to the ground after the first hard frost. Apply a light layer of mulch if you live in an area with extreme temperature fluctuations.
In containers: It grows well in containers, but ensure the pot is at least 30 centimeters wide to accommodate its spreading habit.

Division

1. Dig up the clump in early spring.
2. Use a sharp spade to divide the root mass into smaller sections.
3. Replant the divisions immediately at the same depth.

Plant in groups to create a dense patch that suppresses weeds effectively.

Grows well with

Purple Coneflower · They share similar light requirements and provide a nice color contrast.
Daylily · The foliage textures complement each other well in a border.

Similar species

Common Yarrow · It is a close relative but prefers much drier soil conditions.

Science

Family: Asteraceae
Genus: Achillea
Order: Asterales
Class: Magnoliopsida
Native range: Europe and western Asia.
Conservation: Not of conservation concern as it is widespread and often considered a vigorous grower.

It thrives in damp meadows and along stream banks where it can spread through its rhizomatous root system.

Value to wildlife: nectar source
Pollinators: bees, butterflies, beetles
Uses: cottage gardens, cut flowers, pollinator borders

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 5/9
Moisture: 7/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: Yes, it performs best in full sun but will tolerate partial shade.
Is it invasive?: It can be vigorous and spread quickly, so monitor it in smaller garden beds.

Where the name comes from

The name Achillea honors the Greek hero Achilles, who reportedly used the plant to treat wounds, while ptarmica comes from the Greek word for sneeze.

Good to know

It is commonly called Sneezewort because the dried leaves were once used to make sneezing powder.
Unlike many other yarrows, this species prefers moist soil.
It spreads by underground rhizomes and can be quite aggressive in the right conditions.
The flowers are excellent for drying and using in winter arrangements.

Also in

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.