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How to Grow Spiraea

Spiraea

Perennial

Spiraea is an easy, reliable deciduous shrub that thrives in full sun in most UK soils. The key to good results is knowing your pruning group — spring-flowering types are pruned after flowering, while summer-flowering types like S. japonica are hard pruned to about 30cm in March. Summer types respond brilliantly to hard annual pruning, producing fresh colourful foliage and abundant flowers. Spiraea is fully hardy, drought-tolerant once established, and rarely troubled by pests or diseases.

Yearly Lifecycle

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JanFebMarAprMayJunJulAugSepOctNovDec
Bud Break Flowering Growing Leaf Fall

Care Essentials

Mulch with compost in spring. Rarely needs additional feeding.

Watch For

  • Aphids
  • Powdery mildew
  • Generally trouble-free

Companions

Geraniums, Lavender, Nepeta

Track your Spiraea care schedule — pruning, feeding, and seasonal tasks

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Care Requirements

☀️ Light

Full sun for best flowering

Full sun for best flowering. Tolerates partial shade but flowers less freely. Avoid deep shade.

💧 Watering

Water to establish, then fairly drought-tolerant

Water during dry spells in the first couple of years. Established plants are fairly drought-tolerant. Avoid waterlogged soil.

🌱 Fertilizing

Compost mulch in spring, rarely needs more

Mulch with compost in spring. Rarely needs additional feeding on reasonable soil.

✂️ Pruning

Prune by type — after bloom or hard in March

Spring-flowering types — prune after flowering. Summer-flowering types — hard prune in March to about 30cm. S. japonica types respond well to hard annual pruning for fresh colourful foliage.

Growing Tips

Prune by type

Know your pruning group — spring-flowering types prune after flowering; summer types hard prune to 30cm in March.

Hard prune japonica types

S. japonica types respond well to hard annual pruning, producing fresh colourful foliage and more compact growth.

Low maintenance

Spiraea rarely needs feeding — a compost mulch in spring is sufficient on most soils.

Full sun for flowers

Plant in full sun for the best flowering; spiraea tolerates partial shade but flowers less freely.

Pests & Diseases

Pest Aphids

Identification: Clusters of green or black insects on young shoot tips; sticky honeydew; distorted new growth

Organic treatment:
  • Blast off with a jet of water
  • Encourage ladybirds, lacewings and hoverflies
Chemical treatment:
  • Fatty acid spray for heavy infestations
Pest Spiraea Leaf Miner

Identification: Brown blotch mines within leaves; affected leaves may curl and brown at edges

Organic treatment:
  • Pick off and destroy affected leaves
  • Prune out heavily affected shoots
Chemical treatment:
  • Rarely warranted; systemic insecticide only for severe cases
Disease Powdery Mildew Podosphaera spiraeae

Symptoms: White powdery coating on leaves and shoot tips; distorted new growth; premature leaf drop

Treatment: Prune out affected growth. Improve air circulation.

Prevention: Space plants well. Avoid overcrowding. Water at the base.

Disease Leaf Spot Various fungal species

Symptoms: Brown or dark spots on leaves, sometimes merging; affected leaves may yellow and drop early

Treatment: Remove and destroy affected foliage. Clear fallen leaves in autumn.

Prevention: Ensure good air circulation. Avoid overhead watering. Mulch to prevent rain splash.

Log Spiraea in your garden — track growth, care, and harvests year after year

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