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Hydrangeas can be pruned in December, but whether you should prune your hydrangeas in December depends on the type of hydrangea and your climate.
Pruning hydrangeas in December can be appropriate for some varieties because it is typically their dormancy period, which helps the plant heal quickly after pruning.
However, pruning hydrangeas in December is not ideal for all types, as some bloom on old wood, and cutting them back too late may remove next season’s flower buds.
In this post, we will explore whether you can prune hydrangeas in December, the key factors to consider, and the best pruning practices for different hydrangea types during the winter months.
Why You Can Prune Hydrangeas in December
When asking can you prune hydrangeas in December, the simple answer is yes, but with some important caveats.
December usually falls in the late dormant season for hydrangeas, making it a safer time to prune without causing much stress to the plant.
1. Hydrangeas Are Dormant in December
Most hydrangeas enter dormancy during the colder months, including December, meaning the plant’s growth has slowed or stopped.
Pruning hydrangeas in December takes advantage of this dormancy, allowing cuts to heal before the plant starts spring growth.
When you prune during dormancy, hydrangeas have less risk of disease or pest problems because the plant isn’t actively growing.
2. Clearer View of Branch Structure
Pruning hydrangeas in December means you can see the branch structure clearly without leaves getting in the way.
This clear view makes it easier to remove dead, damaged, or weak stems and shape your hydrangea properly.
By pruning in December, you help your hydrangea focus energy on stronger wood, which can lead to better blooms.
3. Controls Size and Shape Before Spring Growth
Pruning hydrangeas in December allows you to control the size and shape of your hydrangea before it breaks dormancy in spring.
This gives you a chance to prepare the plant instead of waiting until it starts to leaf out or bloom.
Starting spring with a well-structured plant can boost overall health and flowering potential.
When You Should Avoid Pruning Hydrangeas in December
Even though you can prune hydrangeas in December, it’s essential to know when it’s best to avoid pruning, depending on the specific hydrangea type and climate.
1. Not All Hydrangeas Bloom on New Wood
Some hydrangeas bloom on old wood, meaning the flower buds form on stems from the previous season.
If you prune these types of hydrangeas in December and cut back last year’s stems too hard, you risk removing flower buds and reducing blooms the following spring.
Bigleaf hydrangeas (Hydrangea macrophylla) are a common example of this—they bloom on old wood and usually should be pruned immediately after flowering, not in December.
2. Harsh Winter Temperatures Can Damage Fresh Cuts
In colder climates, pruning hydrangeas in December can expose fresh cuts to extreme freezing temperatures.
These freezing temperatures might damage or kill new growth if pruning is done too early or too severely.
Waiting until late winter or early spring for pruning might be safer where frosts are severe.
3. Some Hydrangeas Benefit From Late Winter or Early Spring Pruning
Hydrangea types like panicle hydrangeas (Hydrangea paniculata) and smooth hydrangeas (Hydrangea arborescens) bloom on new wood.
For these types, pruning in late winter or early spring encourages strong new growth and robust flowers, making December pruning less ideal.
So, while you can prune these hydrangeas in December, waiting a little later might produce better results.
How to Prune Hydrangeas in December
If you decide to prune your hydrangeas in December, follow these friendly tips to ensure your plant stays happy and healthy.
1. Identify Your Hydrangea Type
Before pruning, make sure you know the species or variety of your hydrangea to decide whether December pruning is appropriate.
Bigleaf and oakleaf hydrangeas usually should not be pruned in December, while panicle and smooth hydrangeas generally handle it better.
2. Use Clean, Sharp Tools
Always use clean, sharp pruning shears or loppers to make smooth cuts.
Clean cuts heal faster and reduce the chance of disease entering the plant.
Don’t forget to disinfect your tools if you’ve been pruning diseased plants previously.
3. Remove Dead or Damaged Wood Only
When pruning hydrangeas in December, focus on removing only dead, diseased, or damaged branches rather than heavy or severe pruning.
This helps the plant conserve energy and heal well before spring growth.
Avoid cutting into live wood if you’re unsure whether your hydrangea blooms on old or new stems.
4. Prune Lightly to Maintain Shape
If you want to shape your hydrangea in December, prune lightly without cutting back the entire plant too hard.
Light pruning keeps the plant tidy and manageable without sacrificing flower potential.
5. Protect Pruned Plants in Colder Zones
In areas with severe winter cold, consider protecting your hydrangeas after pruning with mulch around the base or burlap wraps.
This shielding helps prevent frost damage and encourages healthy regrowth in spring.
What Happens If You Don’t Prune Hydrangeas in December?
If you decide against pruning hydrangeas in December, don’t worry—your plants can still thrive with proper care.
1. Pruning at Other Times Works Well
Many gardeners prune hydrangeas in early spring, late winter, or after flowering because these times suit different hydrangea species better than December.
For example, bigleaf hydrangeas and oakleaf hydrangeas gain the most blooms when pruned right after blooming, not in December.
2. Delaying Heavy Pruning Can Protect Flower Buds
If you’re unsure about pruning in December, waiting until after the danger of frost or flowering season keeps your flower buds safe.
This way, you avoid pruning off developing blooms accidentally.
3. Leaves and Branches Provide Winter Protection
Leaving some growth on the plant during winter, instead of pruning hard in December, can offer protection to the roots and buds against cold weather.
Old leaves and branches act as natural insulation through harsh weather.
So, Can You Prune Hydrangeas in December?
You can prune hydrangeas in December, but whether you should depends on the type of hydrangea and your climate.
December is a good time to prune hydrangeas that bloom on new wood, like panicle and smooth hydrangeas, because they can handle winter pruning without losing flowers.
However, if you have bigleaf or oakleaf hydrangeas that bloom on old wood, pruning in December might reduce flowering next spring, so it’s best to prune those just after flowering instead.
For all hydrangeas, pruning lightly in December by removing dead or damaged wood and shaping gently can help maintain plant health and appearance.
Remember to use clean tools and protect pruned plants in cold climates for the best results.
So yes, you can prune hydrangeas in December, but make sure to adjust your pruning timing and approach according to your hydrangea type and local weather conditions.
With a little care and attention, your hydrangeas will jump into the growing season healthy and ready to bloom beautifully.