Hi, friends! Today I will tell you when is the best time to prune Oakleaf Hydrangeas.
⚡QUICK ANSWER: Prune oakleaf hydrangeas right after they finish flowering in summer. This allows new buds for next year to form before fall. Avoid pruning in late summer or fall, as it can remove next season’s blooms.
When to prune?
The best time to prune oakleaf hydrangeas is immediately after flowering. At this time, new flower buds have not yet formed, so you don’t risk losing lush blooms next year.
How to prune?
When pruning, cut the flower clusters precisely where they attach to the stem. Avoid cutting below this point, as it can damage the buds that produce next season’s flowers, leading to fewer blooms.
Shaping or reducing the size of hydrangeas is a routine task, but remember that they bloom on old wood. Over-pruning can remove these essential buds, drastically reducing or even eliminating flowering the following year.
When to prune deadwood?
Pruning deadwood is essential for keeping plants healthy and attractive. It can be done almost any time of year, except during winter. Branches often become damaged or broken by snow, disease, or other factors—especially in young stems during spring.
Removing deadwood not only improves the plant’s appearance but also encourages new growth. When pruning, make sure to remove all dead wood completely. It’s fine to cut slightly into the living wood—this helps ensure the dead tissue is gone. Over time, the plant will naturally heal these small cuts.
After pruning
After pruning, it’s important to treat hydrangeas with a fungicide solution to protect them from fungal infections that can enter through fresh cuts. Without this step, the plant may become diseased or even die.
Hydrangeas have large leaves that cause high water loss through evaporation, so they need consistent moisture. Water the plant whenever the top inch of soil feels dry to the touch. Insufficient watering often leads to yellowing leaves.
To help the plant recover, provide extra nutrients. Apply a liquid fertilizer right after pruning to stimulate new growth, then follow up with a slow-release fertilizer that has a balanced NPK ratio (Nitrogen, Phosphorus, Potassium).
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I purchased an Ellen Huff Oakleaf Hydrangea about 2 months ago. Garden center said it was the best for our southeast Texas heat and the full sun it would be in. Are these spots from sunburn or a fungus, maybe something else?
Hi Catherine,
It is definitely a fungus. Remove the most damaged leaves and spray the hydrangea with a copper fungicide. Repeat the spraying after a week.
Also provide it with shade from the afternoon sun.
I hope this helps. I wish you all the best!
Hi thank you for the clear and simple directions.
One question – for pruning deadwood, is the fungicide still needed? ALSO is the fertilizer still needed?
Greetings,
After pruning dead wood, you do not need to use fungicide and fertilizer.
I hope this helps. Happy gardening!
Oak Leaf hydrangeas, is September too late to trim the spent blooms that are dried up in Missouri zone six? I normally trim them off in the spring because even dried up they are so pretty.
Hi Cheryl,
September is a bit too late to prune Oakleaf hydrangeas if you want to protect next year’s blooms. Because they set their flower buds for the following season in late summer and early autumn, trimming them now risks cutting off next year’s flowers.
Your instinct to leave them until spring is spot on. Since you enjoy the dried panicles for winter interest and structure, leaving them on the plant through the cold months is the best approach. If you do ever want to tidy up spent blooms without waiting for spring, the safest window is immediately after they finish flowering in mid-to-late summer, before the new buds begin to form. For now, let them be, enjoy the dried blooms and autumn foliage, and save your snips for spring.