Bridal wreath spirea

Sun

Full sun for the most flowers; tolerates light partial shade.

Water

Water regularly during establishment. Once established, it tolerates short dry spells but benefits from deep watering during prolonged drought.

Soil

Average, well-drained soil; tolerates clay, loam and sandy soil, and a broad pH range. Avoid persistently waterlogged ground.

Height

5-8 ft (1.5-2.4 m)

Spread

7-10 ft (2.1-3 m)

Flowers

Late spring to early summer; small white flowers in rounded clusters along the previous year's branches.

Foliage

Small blue-green leaves, often shallowly three-lobed, turn yellow and sometimes orange or purplish in autumn.

Growth

Fast when young, slowing as it matures.

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Cold hardy
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.6 ft (0.79 m)

3. After 2 years

   4 ft (1.1 m)

4. After 3 years

   4 ft (1.4 m)

5. After 5 years

   6 ft (2 m)

   full size

About 5 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Mildly toxic: may upset a stomach

Growth rate

Moderate

• Water deeply during the first growing season whenever the root zone begins to dry.
• Apply 2-3 in (5-8 cm) of organic mulch, keeping it clear of the stems.
• In established plants, water during prolonged dry weather rather than giving frequent light sprinklings.
• On poor soil, add a light dressing of compost in spring; avoid heavy nitrogen feeding.
• Allow space for the arching branches to reach their natural width.

Pruning. Prune immediately after flowering, removing up to one-third of the oldest stems at ground level and shortening awkward shoots to a side branch. Avoid routine winter pruning or shearing, which removes flower buds and spoils the arching shape.

Early spring

Remove dead or damaged wood and check that mulch is clear of the stems.

Spring

Plant container-grown shrubs while conditions are cool and the soil is workable; water thoroughly.

Late spring

Enjoy flowering and wait until the flowers fade before pruning.

Early summer

After flowering, thin out older stems and take softwood cuttings if wanted.

Summer

Water young plants during dry spells and inspect foliage for aphids or mildew.

Autumn

Plant in mild regions while the soil remains warm, and renew mulch as needed.

• Use as an informal flowering hedge, allowing enough width for branches to arch freely.
• Place at the back of a mixed border with peonies, catmint and hardy geraniums in front.
• Grow as a specimen in a broad lawn or large bed where its fountain-shaped outline is visible.
• Combine with lilacs and spring bulbs in a traditional spring-flowering shrub border.

Garden styles it suits: English country, Traditional, Cottage garden, Romantic rose garden, Low-maintenance and White garden.

Plant it with: Lilac, Peony, Catmint, Hardy geranium, Lady's mantle and Daffodil.

Wildlife: The flowers provide pollen and nectar for visiting insects, including bees and flies. Dense mature branches offer shelter for small birds, but this hybrid is not a substitute for locally native shrubs in a habitat-focused planting.

• Few flowers: excessive shade, heavy nitrogen feeding or winter pruning can reduce bloom; provide more sun and prune only after flowering.
• Aphids on soft shoots: wash off small colonies with water and preserve ladybirds and other predators.
• Powdery mildew: improve air circulation, avoid overcrowding and water the soil rather than repeatedly wetting the foliage.
• Root decline in wet ground: improve drainage or move the shrub; it will not thrive in persistently saturated soil.

Not known to be toxic to cats, dogs, horses or people; no plant parts are recognised as seriously poisonous. It is not an edible plant, and eating substantial amounts of foliage may cause stomach upset.

• Double bridal wreath spirea (Spiraea prunifolia 'Plena')

  Has small, double, rose-like white flowers, often opening before or as the leaves emerge; Vanhoutte spirea has single flowers and usually flowers with its foliage already developed.

• Nippon spirea (Spiraea nipponica)

  Usually forms a denser, more compact shrub with rounded, mostly unlobed leaves and flower clusters concentrated toward the branch tips.

• Thunberg spirea (Spiraea thunbergii)

  Has much narrower leaves and fine, twiggy growth, and generally flowers earlier in spring.

The epithet vanhouttei honours Belgian horticulturist Louis van Houtte, while bridal wreath refers to the arching sprays of white flowers.

Propagation. Take softwood cuttings in early summer or layer a low branch into the soil. Vegetative propagation preserves this hybrid's characteristics; seedlings may differ from the parent.

Accepted botanical name

Spiraea vanhouttei

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.