The best time to prune hydrangeas It depends on the species and whether it blooms on old branches or on the year’s shoots.. In large-leafed hydrangeas (Hydrangea macrophylla), heavy pruning in winter can eliminate the flower buds for the following season, while Hydrangea paniculata and Hydrangea arborescens They can be pruned in late winter or early spring.
Hydrangea plant
The hydrangea is a deciduous shrub cultivated primarily for its large flower heads. Among the most common are Hydrangea macrophylla, H. serrata, H. paniculata, H. arborescens and H. quercifolia, and Not all plants need the same pruning.. Identifying the variety before cutting is key to not losing flowers.
Table of Contents
- Technical sheet on pruning hydrangeas
- When should hydrangeas be pruned?
- How to prune hydrangeas to encourage lots of flowers?
- Pruning hydrangeas in summer
- Pruning hydrangeas in October and winter
- When should potted hydrangeas be pruned?
- Pruning and transplanting hydrangeas
- On what moon are hydrangeas pruned?
- When should hydrangeas be pruned in Madrid?
- Frequently Asked Questions (FAQ) about when to prune hydrangeas
Technical sheet on pruning hydrangeas
| Aspect | Recommended moment |
|---|---|
| Hydrangea macrophylla | Late winter or spring, with light pruning |
| H. serrata | Spring, in moderation |
| H. paniculata | Late winter or early spring |
| H. arborescens | Late winter or early spring |
| H. quercifolia | After flowering or minimal pruning |
| Climbing hydrangea | Just after flowering |
The most important rule is simple: Before pruning, you need to know what kind of wood the hydrangea blooms on.. Varieties that flower on the previous year’s branches should not be heavily pruned before flowering. Those that flower on new wood tolerate more significant pruning at the end of winter.
When should hydrangeas be pruned?
Generally speaking, many hydrangeas are pruned in late winter or during springBut the date varies depending on the species. H. macrophylla and H. serrataThe RHS recommends light pruning towards mid-spring, while H. paniculata and H. arborescens They can be pruned in early spring.
In a Hydrangea macrophylla Traditionally, the wisest course of action is to wait and remove the dried flowers and damaged parts, avoiding cutting the stems that contain the future buds.. Overly intensive pruning can result in many leaves and few flowers. during the following season.
How to prune hydrangeas to encourage abundant blooms
To achieve abundant flowering, first remove dry, weak, damaged or poorly oriented branches. Then, in hydrangeas that bloom on old wood, keep the young, productive stems and avoid cutting back the entire shrub.
In H. paniculata and H. arborescensAlternatively, some of the previous year’s vegetation can be cut back to leave healthy buds. This pruning encourages new growth and can increase the size and abundance of the inflorescences.
Pruning hydrangeas in summer
Summer is not the right time to heavily prune all hydrangeas. H. macrophylla, Major pruning should be avoided once the flower buds for the following year have already formed.. After flowering, a light cleaning of withered flowers can be done, depending on the variety.
The clearest exception is the climbing hydrangea (Hydrangea anomala subsp. petiolaris), which is pruned right after flowering, trimming the overly long shoots and trying to preserve the upper area, where much of the flowering is concentrated.
Pruning hydrangeas in October and winter
Pruning a hydrangea in October is usually not a good idea if it is a variety that blooms on old wood. By cutting the stems in autumn, you can remove the buds that will overwinter and produce the flowers for the following season.
During winter, it’s best to prioritize observation and only remove clearly dead or damaged wood when necessary. H. paniculata and H. arborescensStructural pruning can be done at the end of winter or the beginning of spring, before active growth.
When should potted hydrangeas be pruned?
Potted hydrangeas They are pruned following basically the same criteria as those planted in the ground. The decisive factor is not the container, but the species or variety and the wood on which it produces its flowers.
For a potted, large-leafed hydrangea, moderate pruning is advisable, preserving any stems that may contain flower buds. Furthermore, it’s important to avoid drastic pruning combined with unnecessarily aggressive repotting, especially when the plant is under stress from cold, heat, or lack of water.
Pruning and transplanting hydrangeas
Pruning and transplanting are different tasks and It is not necessary to do them at the same time. If a hydrangea needs to be repotted, it is best to first identify its appropriate growth period and carry out a proportionate intervention, maintaining a balanced structure.
Severe pruning can reduce flowering during that season, especially in older-wood varieties. When the main goal is to maintain the flowers, thinning is preferable to drastically reducing the entire shrub.
On what moon are hydrangeas pruned?
There is no solid scientific basis to claim that a specific lunar phase is necessary for pruning a hydrangea. Current pruning recommendations are based primarily on the species, the type of wood that produces the flowers, the state of the plant, and the climatic conditionsnot in the phase of the Moon.
Therefore, it is more useful to choose an appropriate time according to the variety and avoid periods of frost or conditions that may hinder the recovery of the cuts.
When should hydrangeas be pruned in Madrid?
In Madrid, where winters can bring cold spells and spring temperatures can change rapidly, It is not advisable to focus solely on a calendar date. In hydrangeas with old wood, it is preferable to wait until the main risk of frost has passed and check which stems are still alive before pruning.
For H. paniculata and H. arborescensPruning can be concentrated in late winter or early spring. H. macrophyllaA light pruning in spring allows for better identification of live buds and reduces the risk of removing productive branches.
Frequently Asked Questions (FAQ) about when to prune hydrangeas
When should hydrangeas be pruned in general?
The most common time is late winter or springHydrangeas that bloom on old wood should be pruned much more sparingly. Varieties that bloom on new wood allow for more intensive pruning before the start of the growing season.
When should hydrangeas be pruned to encourage more blooms?
To encourage flowering, avoid cutting branches that contain future buds on older-wood varieties. On younger-wood varieties, pruning in late winter can stimulate new flower buds and produce larger inflorescences.
Can hydrangeas be pruned in October?
It is not recommended as a general rule.especially in Hydrangea macrophyllaBecause by autumn the buds for the next flowering may already have formed. Pruning at that time can remove them and considerably reduce the number of flowers the following year.
Can hydrangeas be pruned in winter?
Yes, but It depends on the species.. H. paniculata and H. arborescens They allow pruning in late winter, while in H. macrophylla It is usually safer to wait and do light pruning when spring begins.
When should hydrangeas be pruned in Madrid?
In Madrid, the most useful reference is late winter and springadjusting the timing to the risk of frost and the variety being cultivated. In large-leafed hydrangeas, it is advisable to delay heavy pruning and preserve branches with live buds.
Sources consulted
RHS: Hydrangea pruning and How to grow shrubby hydrangeas.
Penn State Extension: When to Prune Which Hydrangea Species and Why Doesn’t My Hydrangea Bloom?.
Department of agriculture: Pruning spring-flowering shrubs: Hydrangea (Hydrangea macrophylla).
