No. 03 · October 2026

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Flora & Field

Common Yarrow

Achillea millefolium

A sun-loving rhizomatous perennial with aromatic divided leaves, flat summer flower clusters, and a spreading habit that needs deliberate boundaries.

Published Last updated

At a glance

Light
Full sun
Water
Low to moderate after establishment
Soil
Average to lean, well-drained soil
Hardiness
Zones 3–9
Bloom
Late spring through summer
Height
1–3 ft · 30–90 cm
Botanical identification plate of Common Yarrow, Achillea millefolium
Finely divided aromatic leaves and dense, flat-topped clusters of tiny flower heads identify common yarrow.View full plate
In this guide

Overview

Common yarrow is a deciduous herbaceous perennial with aromatic leaves divided into many narrow segments and numerous tiny flower heads packed into broad, flat clusters. Wild plants commonly flower white to cream; named garden selections may be pink, yellow, orange, or red, so foliage and flower structure are more dependable than color alone.

The plant spreads rapidly through shallow rhizomes and also sets seed. That habit suits meadows, rough grass, and naturalized sunny areas, but it can overwhelm a small mixed border or fine lawn. Reserve an edge that can be cut or lifted, and deadhead before seed ripens if volunteers are not wanted.

Full sun and well-drained average or lean soil produce the firmest growth. Established plants tolerate drought, while rich feeding, shade, and routine irrigation encourage lax stems. A species clump commonly reaches 1–3 ft in both height and spread, with cultivar stature varying beyond that range.

Plant a container-grown crown at its existing soil line, keeping the basal leaves above mulch. Water during establishment, then let the upper soil dry between soakings. A permanently wet pocket is more damaging than ordinary summer dryness because it favors root and stem rot.

Deadheading may extend flowering and sharply reduces self-sowing. Cut faded stems back to healthy basal leaves, leaving that low foliage intact, then clear dead stems before spring growth. Wear gloves when handling the plant, and keep pets and livestock from browsing it because retained veterinary and Extension sources identify dermatitis and ingestion hazards.

Family
Asteraceae
Range
Greenland and subarctic to temperate Eurasia; North American status varies by taxonomic treatment
Soil pH
6–8
Spread
1–3 ft · 30–90 cm

Planting & careHow to grow common yarrow

Common yarrow can spread aggressively by shallow rhizomes and seed, especially in open disturbed soil. Taxonomic treatments disagree on how broadly the species is native in North America, so use regional flora and invasive-plant guidance when native status matters.

  1. 1
    Choose a controllable site

    Use full sun and well-drained soil in a meadow, gravel bed, or border edge where wandering rhizomes and seedlings can be reached without disturbing delicate neighbors.

  2. 2
    Allow for a spreading colony

    Reserve 1–3 ft for the species and decide the boundary before planting. A narrow isolated pocket will require continual removal as the rhizomes extend.

  3. 3
    Keep the basal crown at grade

    Set the root ball at its nursery soil line and keep the basal rosette exposed. Backfill with the site soil and water once thoroughly to settle the roots.

  4. 4
    Water only through establishment

    Water when the root ball begins to dry during the first season. Once established, reduce routine irrigation and intervene mainly during prolonged drought.

  5. 5
    Leave the rosette uncovered

    Keep deep organic mulch away from the basal leaves and shallow rhizomes. An open surface makes unwanted shoots easy to trace and lowers the risk of trapped moisture.

  6. 6
    Choose a seed policy

    Deadhead before the clusters turn brown where self-sowing is unwelcome. Retain seed heads only where volunteer plants and winter texture fit the planting plan.

Pruning common yarrow

Cut faded flower stems back to healthy basal foliage; this can prolong bloom and limits seed. Remove dead stems before spring growth, and lift complete wandering rhizome sections at the chosen boundary. Wear gloves because contact dermatitis is reported.

Seasonal care

Spring

Remove dead stems, trace rhizomes beyond the intended edge, and divide only if the colony needs renewal or reduction. Keep the fresh basal rosettes uncovered.

Summer

Water established plants only during sustained drought. Deadhead finished clusters before seed ripens, or leave selected heads where volunteers are acceptable.

Autumn

Remove seedlings from formal beds while they are small. Retain clean basal foliage and selected dry stems only where winter texture is worth the added seed.

Winter

Inspect the site after rain for standing water and note any rhizomes entering paths or neighboring crowns. Keep pets and livestock away from dormant plant material.

Safety and garden spread

Spreads vigorously

Rhizomes and self-sown seedlings can overrun a small border. Deadhead and contain the clump; cultivar and local native status matter.

NC State Extension

Common problems

  • Soft, leaning stems

    Look for
    Flowering stems splay outward in a shaded, irrigated, or heavily fertilized position.
    Action
    Increase light where possible and reduce water and fertilizer. Replace a chronically rich or shaded site rather than staking every stem.

  • Powdery coating or stem rot

    Look for
    White patches develop on crowded foliage, or stems darken and collapse where soil remains wet.
    Action
    Open the planting to sun and air, remove affected debris, and correct excess moisture. Confirm the diagnosis locally before considering any labeled treatment.

  • Root decline in wet soil

    Look for
    Sections wilt despite damp soil, roots darken, or the crown pulls apart in a persistently wet pocket.
    Action
    Stop routine watering, remove decayed material, and improve drainage. Replant only sound divisions at the original crown depth.

  • Growth beyond the allotted patch

    Look for
    New rosettes appear along shallow rhizomes or as seedlings in open soil beyond the planned colony.
    Action
    Lift the entire unwanted rhizome section, remove seedlings before they establish, and deadhead earlier if seed is contributing to spread.
  • Garden study showing the placement and growth habit of Common Yarrow
    Garden study showing the placement and growth habit of Common Yarrow

Sources

  1. Achillea millefolium. NC State Extension. Source record · Accessed 2026-09-07.
  2. Achillea millefolium. Royal Horticultural Society. Source record · Accessed 2026-08-30.
  3. Achillea millefolium L.. Royal Botanic Gardens, Kew. Source record · Accessed 2026-08-30.
  4. Toxic and Non-toxic Plants: Yarrow. ASPCA Animal Poison Control Center. Source record · Accessed 2026-08-30.