Spiraea Cantoniensis 'Double White'
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May Bush / Bridalwreath Spirea / Reeves Spirea
Botanical Name: Spiraea cantoniensis 'Flore Pleno'
Family: Rosaceae
Origin: China (East Asia)
Plant Type: Deciduous to semi-evergreen shrub (semi-evergreen in mild Adelaide winters)
Overview
A timeless spring-flowering shrub, Spiraea cantoniensis ‘Double White’ creates a breathtaking display in late winter and spring, when its arching canes are completely covered in fluffy double white pom-pom blooms. Well-suited to Adelaide’s Mediterranean climate, it’s tough, low-maintenance and reliably floriferous once established. Its fine mid-green foliage forms a graceful fountain shape through the warmer months, with soft yellow tints sometimes appearing in autumn.
Key Features
- Mature Size: 1.5–2.5 m H x 1.5–2.5 m W (arching, fountain form)
- Growth Rate: 30-60 cm per year under good conditions
- Foliage: Mid-green, finely toothed leaves; may develop soft yellow-gold tints in autumn or dryness
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Flowers: Profuse double white clusters along the stems in late winter–spring (Aug–Oct); light, subtle floral fragrance detectable at close range
- Seasonal Interest: Spectacular spring flowering; fresh green mound the rest of the year; occasional autumn foliage tints
- Wildlife Value: Attracts bees and beneficial insects (double flowers offer reduced pollen compared to single forms)
- Tolerance: Drought-tolerant once established; heat- and wind-tolerant; light frosts to –5 °C; suitable for coastal suburbs with shelter from direct sea spray
- Planting Density: Hedges: 0.8–1 m apart; Specimens: 1.2–2 m apart
- Pet Friendly: Non-toxic to cats and dogs
Where It Works Best
- Sunlight: Full sun for best flowering; handles light part shade
- Soil: Well-drained loam, sandy loam or improved clay; avoid waterlogging
- Water Needs: Establishment: 2 deep soaks/week for 8–12 weeks. Established: deep soak every 10–14 days in summer; minimal in winter
- Maintenance: Prune immediately after flowering—remove spent tips and up to one-third of oldest canes to maintain arching form and encourage next year’s flowers. Mulch in spring; light feed in early spring
- Lifespan: 15-25+ years
- Climate Zones: Excellent in temperate and Mediterranean SA, including Adelaide plains, foothills, and sheltered coastal gardens
- Soil pH: Slightly acidic to neutral; tolerates mildly alkaline soils
Landscape & Design Ideas
- Romantic bridalwreath hedges along paths, driveways or boundary lines
- Feature shrub near entrances, windows or alfresco areas for seasonal impact
- Stunning backdrop for bulbs and low perennials
- Cut stems make beautiful indoor spring arrangements
Why You Will Love It
‘Double White’ delivers a breathtaking, frothy spring spectacle with almost no fuss. Its elegant arching form, soft seasonal tints and resilience in Adelaide’s dry, warm climate make it a dependable favourite for gardeners seeking classic beauty and easy care.