I. Method
Only in the summer before August should you prune these hydrangeas (to be safe). Some experts think these hydrangeas might still be clipped in August, but this could be dangerous. It’s possible that the hydrangeas have already set the bloom buds for the following year.
For hydrangea varieties that bloom on old wood, use method I. Stems on the hydrangea that have been there since the summer prior to the current season are referred to as “Old Wood.” Stems that the plant developed this season are referred to as “new wood.” Around August, September, or October, this group of hydrangeas produces flower buds on hydrangea stems for the blooms of the following season. The bloom buds will be destroyed if those stems are cut down (pruned) in the fall, winter, or spring, which may result in a minimal or nonexistent bloom the following summer (typically June or July for the northern hemisphere).
You should be aware that pruning is not the same as removing the faded blossoms. (See “Removing Old Blooms” below.) There is a tiny collection of mophead hydrangeas that bloom whenever they are clipped. It is called Endless Summer hydrangea. However, cutting after July will probably result in fewer flowers the next season for the great majority of hydrangeas.
EXCEPTIONS: The pruning technique described above (Method I) will work very well for all mophead hydrangeas. However, one could be perplexed if a friend or neighbor prunes their hydrangea at the “wrong” period, such as in the spring or fall, and it still blooms well.
Unlike the majority of mophead hydrangeas, a handful of them will grow new bloom buds after having their old ones removed (destroyed). They are referred to as “remontant” hydrangeas. The northern parts of the U.S. and Canada seem to have the most gardens with them. Because of this, these unique hydrangeas will regenerate their bloom buds and continue to bloom even if they are damaged by frost or cut off at the incorrect time. The hydrangea Endless Summer is the best illustration of one that achieves this.
When should you prune mophead hydrangeas?
Mophead hydrangeas and lacecap hydrangeas, commonly known as bigleaf hydrangeas (Hydrangea macrophylla), are pruned using the same technique.
With its broad, roundish heads of huge petals in colours of blue, pink, green, and white, mophead hydrangeas are a popular choice for gardens. They are therefore a popular shrub option for cottage garden ideas and are also effective shade-giving bushes.
Small blooms in the center of the bloom and a border of bigger petals on the outside help identify lacecap hydrangeas.
The experts at Thompson & Morgan suggest that in order to winterize hydrangeas, “it’s better to leave the faded blooms in place over the winter to safeguard vulnerable new buds from frost damage.”
Early in the spring, while pruning lacecaps and mophead hydrangeas:
- To promote new growth that will produce better blooms, remove one or two of the plant’s oldest, weakest stems at the base.
- Just above a pair of buds, carefully remove any old flowerheads using secateurs.
- Don’t remove any of the blossom buds, please.
- Cut the stems down to the plant’s root system if the bigleaf hydrangea shrub has been neglected and has a lot of overlapping, tangled branches. The hydrangea won’t blossom until the next year, though.
What time of year should I trim my hydrangea?
Depending on which group the plant belongs to, the timing and extent of pruning are determined:
Advice on Pruning for Group 1:
- As the days get shorter and the weather gets colder in the late summer and fall, buds for the following year’s blooms start to form.
- Typically, removing dead, diseased, or damaged branches is all that is required to preserve shape, size, and a healthy plant. Otherwise, gentle pruning ought to be practiced.
- In the summer, trimming should begin as soon as flowering ends, but no later than August 1. Pruning should not be done in the fall, winter, or spring because you risk removing fresh buds.
- Tip-pruning the branches in the spring as the leaves begin to appear can promote more numerous, smaller flower heads as opposed to fewer, larger flower heads.
Advice on Pruning for Group 2:
- On the growth of the current year, flower buds form.
- Early in the spring, as the leaves are starting to emerge, prune.
- Just above a node, prune branches back by half to a third.
- After that, prune any fragile or spindly branches.
- Minimal trimming encourages huge, strong bushes with many of tiny flower heads in H. arborescens. Hard pruning between 12 and 18 inches from the ground, or even all the way down, will result in fewer but larger flower heads that may flop if unsupported.
- For H. paniculata, remove the surrounding smaller wood while leaving the larger stems in order to establish a sturdy foundation.
Pruning may be connected to flower head size. Shoots will grow more vigorously and flower heads will be bigger and fewer with more rigorous trimming. Smaller but more numerous flower heads may result from less aggressive or tip pruning.
Consideration of hydrangeas’ mature size is the best piece of advise. Place them in a location where they won’t outgrow and won’t need a lot of pruning to keep them in check. Hydrangeas don’t need to be pruned precisely or often; as long as dead wood is removed, they will remain healthy and continue to develop and bloom.
How is a mophead hydrangea cared for?
Mophead hydrangeas are easy to grow and don’t require much skill. As long as they are planted in the right locations, these shrubs thrive with little upkeep. If you plant mophead hydrangeas in USDA plant hardiness zones 5 through 9, caring for them will be the simplest. They thrive in full sun in temperate climates, but in areas with hotter summers, choose a location with afternoon shade.
There are only a few key elements to keep in mind if you’re looking for advice on how to grow a mophead hydrangea.
Include routine irrigation with your shrub installation. Their water requirements decrease as their root systems mature. Typically, you only need to water during extended dry spells of more than a week. However, you might need to water more frequently if you’re growing mophead hydrangea in direct sunlight. You can use less water when irrigating once the summer heat has passed.
Pruning is not always necessary for mophead hydrangea maintenance. If you do want to prune your hydrangea, do it immediately following the shrub’s flowering season.
How is a mophead pruned?
First and first, it’s crucial to understand that mophead hydrangeas never need to be cut back, unless they are quite old. The only pruning necessary for the plant’s health is the removal of dead stems, which can be done whenever you like. Additionally, dead blooms can always be removed.
However, if your hydrangea is getting much too big (or old) and has to be pruned, utilize one of the techniques listed below.
If you have mophead or lacecap hydrangeas (the only varieties that are often blue or pink) or oakleaf hydrangeas, use Method One (leaves shaped like large oak leaves, white blooms).
If you have paniculatas (PeeGees) or “Annabelle,” use Method Two (arborescens). PeeGee and smooth hydrangeas have white blooms.
On aged wood, do mophead hydrangeas bloom?
The variety that forms buds on “aged wood” is the one that is most frequently discovered in gardens. This comprises varieties of Mophead, Big Leaf, and Lacecap hydrangeas (Hydrangea macrophylla), as well as the Oakleaf variety (H. quercifolia). On aged wood, they all create blossoms.
How should a mophead hydrangea be deadheaded?
These are your macrophylla hydrangeas, also known as mophead and lacecap, which come in purple, pink, and blue. They also include hydrangeas with oak-shaped leaves. While reblooming kinds flower twice, some cultivars only bloom once per season on stems from the previous year (old wood).
The initial set of hydrangea blossoms should be deadheaded as soon as they start to turn brown and dry. Cut the stem immediately above the first set of leaves and below the flower head. When this second set starts to fade, you can deadhead once again for reblooming varieties, but only until about mid-August. Your hydrangeas will then produce buds for the flowers of the next year; you don’t want to unintentionally cut these off. After the summer has ended, dried flower heads can remain on the shrubs to add visual interest over the winter.
What occurs if hydrangeas are not pruned?
If and when you prune is the key to happy, healthy hydrangea flowers. Of course, fertilizing and offering the ideal environment have a lot to recommend them. However, if you don’t prune properly, your efforts will be in vain. Deadheading is not the same as trimming. Pruning refers to more drastic cutting to preserve shape or remove dead growth. However, feel free to discard spent blossoms or cut fresh ones to use in arrangements.
Hydrangeas can bloom on either fresh wood or old wood, depending on the species. The wood from which they blossom determines whether and when to prune.
Old wood-blooming hydrangeas do not require pruning and benefit from it. They’ll blossom more abundantly the next season if you leave them alone. But feel free to deadhead or gently thin. Just keep in mind that while new growth may appear, it won’t bloom until the following season. In our region, four different species blossom on aged wood. Additionally, they are not limited to the hues displayed here.
Climb using suckers. On your wall or trellis, resist the desire to remove the dormant growth.
The flower heads are more conical in appearance, and the leaves are large and resemble oak leaves. It’s a pleasant surprise for a hydrangea when its leaves turn reddish-orange in the fall.
They are very comparable to lacecap types, but smaller and with more compact leaves.
Pruning should be done in late winter or early spring on hydrangeas that bloom on new wood. Trim back to two feet to prune to shape. The next season’s blossoms are produced by strong, fresh growth that is encouraged by trimming. In our region, there are two types that bloom on fresh wood. They are also not restricted to the colors displayed.
Oakleaf variants are not included in cone-shaped blooms. Keep the blooms on throughout the winter to provide interest; even dried out, they are quite lovely.
regarded as a wild kind. They often have smaller blooms and leaves than Bigleaf variants and are completely white. They enjoy full sun and can grow very tall.
Knowing whether or when to prune now will help you avoid the disappointment of a hydrangea that doesn’t blossom. Don’t forget that a robust shrub will produce more gorgeous blossoms if it has well-draining soil and good organic fertilizer. Come on in, and we’ll show you where to go to develop your green thumb.
Do I need to remove the Brown hydrangea leaves?
If newly emerging hydrangea leaves or flower buds are exposed to a late-spring frost or chilly winds, they will turn brown. A unexpected cold spell can harm the newly emerging buds and leaves, which are exceptionally delicate and susceptible to injury. This can cause the buds to turn brown and wither away.
Naturally, hydrangeas grow in protected regions under trees that block chilly winds and produce a more stable microclimate that allows the young flowers to open up without facing a serious risk of frost.
Hydrangeas’ newly formed buds and leaves can become mushy and their leaves can turn brown when they sustain frost damage.
Since it is more exposed to the environment, the outermost growth is typically the one that suffers from the worst damage.
Sadly, the harmed flower buds are therefore unable to bloom, and the freshly growing growth is probably not going to recover.
Frost damage to hydrangea flower buds and foliage is more common in exposed areas, so plant or move your hydrangea to a more protected area of the garden, close to your house, or close to some other plants and hedges.
Particularly hedgerows are great wind breakers since they shield your hydrangea from the elements and might lessen the effects of frost.
There isn’t much you can do to save flower buds or younger leaves after they turn brown. As a result, prune back to healthy growth any growth that has been harmed by the frost.
In contrast to the flower buds on the plant’s outermost part, which are naturally less protected, hydrangeas frequently have growing flower buds farther down each branch. These flower buds typically survive a frost.
This implies that your hydrangea can still bloom, but much later and with fewer flowers emerging. With a little patience, you should still be able to enjoy some lovely blooms throughout the Summer.
How can I encourage my mophead hydrangea to bloom more?
Smooth hydrangeas (Hydrangea arborescens), which get their name from the texture of their huge leaves, are more well-known for their massive, spherical, white flower heads. The most popular type, “Annabelle” (also known as Snowball Bush), was identified as coming from Anna, Illinois, by a horticultural expert in the 1960s. The ‘Annabelle’ hydrangea displays large, pure-white blooms that gradually turn green. A more recent cultivar, Invincibelle Spirit, blooms pink rather than the usual white. The smooth hydrangea, which is native to parts of North America, starts blooming in late June and keeps periodically flowering all summer long. In zones 4 through 9, it thrives in sunny or slightly shaded environments.
How to Get More Smooth Hydrangea Flowers:
- If the soil is damp, grow smooth hydrangeas in full sunlight. (Spots that occasionally dry out benefit from partial shade.)
- In droughts, especially in the sweltering summer, water them.
- soil amendment using organic matter (such as compost).
- In the early spring, soon as new growth begins to appear, trim back stems.
Mop head hydrangeas grow to what height?
In acidic soil, the mophead hydrangea’s blossoms are deep blue, and in more alkaline soil, they are magenta. In Zones 5 through 9, it grows to a height and width of three feet.
Late winter is in what month?
Four to six weeks of late winter pass before the spring thaw. Depending on your climate, this may occur at any time between January and May. Count backwards from your typical last frost date.
Pruning mophead hydrangeas
Mophead hydrangeas bloom from buds that were created the year before. To avoid chopping off flower buds, they just need deadheading and very little pruning.
Mophead hydrangeas should not be pruned until late spring since the old flowerheads provide some shelter from late frosts for the young buds.
- Cut back to the first pair of robust buds beneath each flowerhead while deadheading any old flowerheads.
- Remove any stems that are crossing, dead, or damaged.
- To encourage the plant to develop new growth, prune one or two old stems down to the ground on older plants.
Pruning lacecap hydrangeas
Lacecap hydrangeas are maintained similarly to mophead hydrangeas and bloom on buds that have developed over the previous year. Mophead hydrangeas need to be clipped in the spring, whereas lacecap hydrangeas can be pruned in the fall.
- Cut back to the second pair of buds beneath each flowerhead while deadheading all old flowerheads.
Pruning Hydrangea paniculata and Hydrangea arborescens
Both of these species need new growth to produce flowers, therefore prune them in the early spring to encourage the emergence of new stems carrying flowers.
- Remove any damaged or crossed branches as well as any dead timber.
- Cut the stems from last year’s plant by roughly a third, just above a pair of robust, healthy buds.
Pruning climbing hydrangeas
Because climbing hydrangeas take a while to take off, pruning is typically unnecessary for the first two to three years following planting. Once they do begin to grow, they can develop into very vivacious plants that can grow as tall as 10 m (32 ft), therefore it’s a good idea to cut them each year to keep them in check.
- To reduce the chance of removing any future flower buds, prune as soon as possible after summer flowering.
- Cut back any exceptionally long, straggling shoots to a pair of lower, strong, healthy buds. Since the majority of the blossoms will grow at the plant’s top, try not to remove too much of it.
A mature climbing hydrangea can be pruned in the spring to make it smaller. Hard trimming won’t harm climbing hydrangeas, but it will probably result in less flowers for a year or two following. To lessen the stress on the plant, if you are drastically shrinking the size of the plant, do so gradually over two or three years.
Other hydrangea varieties, such Hydrangea aspera and the oak-leaved hydrangea (Hydrangea quercifolia), just require a mild spring pruning to maintain size, give the plants a pleasing form, and remove any dead wood.
It’s fairly easy to prune hydrangeas, and the benefits are well worth the work. If you follow our detailed instructions, your borders will be covered in blooms this summer.