The Best Pruning Time for Hydrangeas
A brief knowledge sharing with you about the best pruning time for hydrangeas and how to prune them in autumn. Let's learn together.
It's the end of August, and people are not only concerned about the autumn pruning of roses but also many gardening enthusiasts are asking how to prune hydrangeas in autumn? Many people say that the latest pruning time for hydrangeas is at the end of August. Is that true?
The Best Pruning Time for Hydrangeas
The reason there are many opinions about the pruning time for hydrangeas is that most large-flowered hydrangeas bloom on old branches. Pruning too late or using the wrong method will cut off the hydrangea flower buds, leading to leaf growth without flowers in the second spring, hence the emphasis on pruning time.
Generally, pruning immediately after the hydrangeas have finished blooming is fine. Post-bloom pruning is not wrong, whether it's a variety that blooms on old branches or one that blooms on both old and new branches. Post-bloom pruning does not affect the blooming in the second year and is quite flexible, allowing for random pruning since the plant will regrow in summer.
If pruning is not done promptly after the summer blooming, by the time autumn arrives, the hydrangeas may have grown quite tall. If you still want to prune them to reduce height, this pruning requires more attention, as mistakes can affect next year's blooming.
Autumn Pruning Methods for Hydrangeas
If your hydrangeas were pruned after flowering but have grown tall again, it is not recommended to prune them in autumn. The top buds of hydrangeas can easily be frostbitten during winter, so if the hydrangeas are not too tall in autumn, there is no need to prune, leaving room for the frosted parts.
If the temperature in your area remains above 0 degrees Celsius in winter and hydrangeas do not suffer frost damage, and you feel that the hydrangeas are too tall, you can prune them moderately in autumn. The specific pruning amplitude should be determined based on the variety of hydrangea.
1. - - VarietiesBlooming on New Branches - -
If it's a variety like 'Endless Summer' that blooms on new branches and has a good growth in autumn, you can enhance fertilization and watering, and it may bloom again in autumn.
For varieties that bloom on both old and new branches, whether pruning in summer or autumn has little effect on the next year's blooming. Even if heavily pruned in winter, the new branches in the second summer can still bloom, though the blooming time is usually later, possibly in June or July.
If you don't mind the hydrangeas blooming in autumn and feel they are too tall, you can prune them in autumn. It is recommended not to prune too heavily; a light prune can lead to flowering by May of the second year.
The Best Pruning Time for Hydrangeas
2. - - VarietiesBlooming on Old Branches - -
However, if it's a large-flowered hydrangea variety that blooms on old branches, pruning in autumn requires attention. Generally, if the plant is not too tall, it is not recommended to prune to avoid cutting off the flower buds.
If the plant is indeed very tall and needs to be reduced in height, the pruning should be done by observing the buds and retaining enough full buds to ensure a good bloom next year. For example, in the picture below, the buds at the bottom are not very full.
Therefore, when pruning, it is necessary to retain as many full buds as possible. Full buds have a better chance of flowering the next year. Moreover, the middle and lower parts of this hydrangea have few leaves. If too much is pruned, it will be close to a bare stem, and without leaf photosynthesis, it will also affect the nutrient accumulation of the hydrangea.
So, when pruning, it is recommended to retain at least a pair of leaves for photosynthesis. For hydrangeas that bloom on old branches, if you are unsure about pruning, not pruning in autumn is the safest approach.
The above information about the best pruning time for hydrangeas and autumn pruning methods, if it can be of help to you, remember to visit GreenEnthusiast.net often!