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How to Grow Achillea

Achillea millefolium

Perennial

Achillea thrives in full sun and well-drained, even poor soil — rich conditions make it floppy. Plant in spring or autumn, water in to settle, then leave it largely alone. Deadhead spent flower heads to encourage a second flush and divide clumps every three to four years in spring to keep plants vigorous. It is fully hardy and needs no winter protection.

Yearly Lifecycle

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JanFebMarAprMayJunJulAugSepOctNovDec
Spring Growth Flowering Growing Leaf Fall

Care Essentials

Rarely needed — thrives in poor to moderate soil. Excess feeding produces floppy growth.

Watch For

  • Powdery mildew
  • Aphids

Companions

Lavender, Echinacea, Grasses, Salvia

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Care Requirements

☀️ Light

Full sun essential for sturdy growth

Full sun is essential for sturdy stems and the best flower colour. Achillea becomes floppy and flowers poorly in shade.

🌿 Spacing

45cm apart; 60cm for vigorous cultivars

Space plants 45cm apart for medium border varieties. Taller, vigorous cultivars and large drifts may need 60cm.

💧 Watering

Drought-tolerant; minimal watering once established

Drought-tolerant once established. Water only during prolonged dry spells in the first season. Overwatering and heavy soil cause root rot.

🌱 Fertilizing

Avoid feeding; thrives in lean soil

Rarely needed. Achillea thrives in poor to moderate soil. Excess feeding produces lush, floppy growth that requires staking.

✂️ Pruning

Deadhead for rebloom; cut back in autumn

Deadhead spent flower heads back to a side shoot to encourage a second flush. Cut all growth to ground level in late autumn or early spring.

Growing Tips

Sun and drainage first

Full sun and lean, well-drained soil produce the sturdiest stems. Avoid rich or heavy ground.

Deadhead for repeat bloom

Cut faded flower heads back to a side shoot to encourage a second flush of colour into autumn.

Divide regularly

Lift and divide congested clumps every 3–4 years in early spring to maintain vigour and spread.

Winter seed heads

Leave some dried seed heads standing through winter for structural interest and wildlife value.

Pests & Diseases

Pest Aphids

Identification: Clusters of green or black insects on shoot tips and flower stems; distorted growth and sticky honeydew

Organic treatment:
  • Blast off with a strong jet of water
  • Spray with insecticidal soap
  • Encourage ladybirds, lacewings, and hoverflies
Chemical treatment:
  • Spray with a contact insecticide containing pyrethrins
Pest Slugs and Snails

Identification: Irregular holes in young leaves and stems; slime trails visible on and around plants, especially in the morning

Organic treatment:
  • Use beer traps or copper tape barriers
  • Apply organic slug pellets (ferric phosphate)
  • Encourage hedgehogs, frogs, and ground beetles
Chemical treatment:
  • Apply slug pellets containing ferric phosphate around plants
Disease Powdery Mildew Erysiphe spp.

Symptoms: White powdery coating on leaves and stems, usually starting on lower foliage; leaves may yellow and drop prematurely

Treatment: Remove and dispose of badly affected foliage. Improve air circulation by thinning crowded clumps

Prevention: Avoid overhead watering. Ensure good spacing and air flow. Divide congested clumps regularly

Disease Stem Rot

Symptoms: Stems blacken and collapse at the base; foliage wilts and dies back. Often affects the centre of congested clumps

Treatment: Remove and destroy affected stems. Lift and divide the clump, discarding any rotted sections

Prevention: Ensure well-drained soil. Avoid heavy, wet clay. Divide clumps every 3–4 years to prevent congestion

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