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Apr 06, Thus the safest time to prune bigleaf hydrangeas is immediately after they have bloomed. Both panicled hydrangea and smooth hydrangea, including ‘Annabelle’ and ‘Samantha,’ flower on new wood or current season’s growth, so they can be severely pruned after fall frost and still flower the following shrublop.buzzted Reading Time: 3 mins.

The Limelight hydrangea blooms on new growth, so it should be pruned in late winter, before new growth begins. Although the florets look similar to those of bigleaf hydrangeas, Limelight has teardrop-shaped bloom clusters and blooming starts later in the summer.

For more on this topic, read: Early Season Pruning.

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There are two simple rules of hydrangea pruning. If it blooms on old wood, you prune after the blooms fade in the middle of summer or else wait until late winter or early spring.

And if it blooms on new wood, then late winter or early spring is the optimal time to prune. Big Leaf and Oakleaf hydrangeas should be pruned no later than early fall, otherwise you may cut off buds preventing any blooms come summer.

For these types of hydrangeas, it’s best to prune immediately after flowering. Paniculata or PeeGee hydrangeas offer a bit more flexibility, but in general, they should be pruned in early spring before new growth appears. Other hydrangeas. Sep 24, Hydrangeas that bloom on old growth should only be pruned after flowering.

Others bloom on new growth and should be pruned before they wake up in spring or as they are going dormant in winter. Mophead and lacecap hydrangeas can be pruned in Estimated Reading Time: 5 mins. Jun 19, Hydrangea macrophylla- French or Bigleaf Hydrangeas. Pruning: Mophead and Lacecap Hydrangea bloom on old wood. Prune immediately after flowering. Flower Color: Bigleaf Hydrangeas color is directly affected by pH. The pH will determine the color of the flower in most cases.

Hydrangeas like ‘Pink Elf’ and ‘Glowing Embers’ can never turn blue. Aug 20, Prune the hydrangea to reduce its size. If your hydrangea has grown quite large, you can prune it in June or July (just after the blooming season) to contain it a bit.

Trim back the branches by 1/3 to the nearest joint. In most cases hydrangeas will grow back quite quickly, so you may not be able to maintain the smaller size for K.