Pruning hydrangeas can be a challenge for many gardeners, but knowing whether your shrub blooms on old or new wood is essential for making the right cuts. While these plants do not need annual pruning, occasional trimming can boost their performance, enhance vigor, and increase flower size. This guide will help you understand how to prune based on the type of hydrangea you have.
Hydrangeas that bloom on old wood include varieties like Bigleaf Hydrangeas and Oakleaf Hydrangeas. These shrubs typically flower in early summer and develop next year’s buds in late summer or early fall. To prevent removing these buds, prune them after the flowers fade in late summer.
1. Tidy Up: Remove spent blooms just below the flower head and trim any unruly canes at the soil line for a clean look.
2. Improve Vigor: Trim some of the oldest canes at the base to encourage new growth and larger blooms, while also managing the shrub’s height by removing the tallest canes.
Hydrangeas that bloom on new wood, such as Panicle Hydrangeas and Smooth Hydrangeas, flower later in the summer and should be pruned in late winter before new growth starts. They are forgiving if not pruned precisely on time, as long as you avoid cutting during their flowering period.
1. Encourage Bigger Flowers: In late winter or early spring, cut these shrubs back to the ground. This hard pruning leads to larger blooms, although some gardeners may prefer smaller flowers on sturdier stems.
2. Reduce Flopping: To prevent branches from bending under the weight of blooms, cut the stems to a height of 18 to 24 inches, providing a strong framework for new growth.
Final tips include using hand pruners or loppers and wearing safety glasses to protect your eyes while pruning. Timing is crucial: prune old wood bloomers after they flower and new wood bloomers before they start growing. Regular pruning will keep your hydrangeas healthy, vibrant, and blooming beautifully for years to come.
By following these guidelines, you can ensure your hydrangeas thrive and showcase stunning flowers every season.
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