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Endless Summer®
It has the unique ability to bloom on new and old wood consistently, producing flowers all summer. Pink or blue blooms are dependent on the acidity of the soil. Deadheading will encourage new flowers.
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Hydrangea arborescens: Blooms on new wood, prune in late winter or early spring.
Hydrangea macrophylla: Blooms on old wood, do not prune. Remove only spent flowers and dead, damaged or unsightly wood.
Hydrangea paniculata: Blooms on new wood, prune in late winter or early spring.
Hydrangea quercifolia: Blooms on old wood, do not prune. Remove only spent flowers and dead, damaged or unsightly wood.
Hydrangea serrata: Blooms on old wood, do not prune
All hydrangea naturally undergo some colour change to their flowers as they age. Adjusting the pH balance of the soil can change the flower colour from pink to blue in some cultivars. Most cultivars thrive in full sun to partial shade as long as they have adequate moisture and a rich, well-drained soil.