Smooth Hydrangea Annabelle is a vigorous deciduous shrub known for its large, round clusters of white flowers that bloom from early summer to early fall. It thrives in USDA zones 4-9 and is valued for its easy care and striking floral display.
USDA Zones
4–9
Height
3 ft–5 ft at maturity
Bloom Season
June – September
Bloom Color
white
🐝 Attracts PollinatorsAttracts bees and other pollinators
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Sun Requirements
Full Sun to Part Shade
Adaptable to 4–8+ hours of sunlight
Soil Type
well-drained, loamy
Care Requirements
Water Needsmedium
Maintenancelow
EvergreenNo
Complete Care Guide
### Care Guide for Smooth Hydrangea Annabelle
Smooth Hydrangea Annabelle is a hardy and low-maintenance shrub that thrives in USDA hardiness zones 4 through 9. It prefers a location with full sun to part shade, ideally receiving morning sun and afternoon shade to protect its blooms from harsh heat. The plant grows best in well-drained, loamy soil enriched with organic matter to retain moisture without becoming waterlogged.
Water regularly during the growing season, especially in dry spells, to keep the soil consistently moist but not soggy. Mulching around the base helps conserve moisture and regulate soil temperature. Fertilize in early spring with a balanced, slow-release fertilizer to promote healthy growth and abundant flowering.
Prune Annabelle hydrangeas in late winter or early spring before new growth begins. Cut back stems to about 12-18 inches above the ground to encourage vigorous new shoots and larger flower heads. This shrub blooms on new wood, so pruning will not reduce flowering.
While generally pest and disease resistant, watch for common issues such as powdery mildew or aphids and treat promptly if needed. The plant is not deer resistant and is toxic to dogs and cats, so keep pets away from ingestion.
With proper care, Smooth Hydrangea Annabelle will reward gardeners with stunning, large white flower clusters that brighten landscapes from June through September.