Only prune these hydrangeas in the summer after bloom, not in the fall. In August and September, old wood hydrangeas begin to form their bloom buds for the following year. It is advisable to delay pruning your hydrangeas until the following year if you don’t do it right away. If not, there won’t be any blossoms the next spring.
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.
Bloom on old wood: prune in late summer or early fall after blooming
Hydrangeas with oakleaf leaves prefer to be left alone so they can grow. They only need the occasional removal of dead or broken branches, which is very little pruning. After the plant has finished flowering, prune it to improve its shape.
How old can a wood hydrangea be determined?
The focus of the previous week was hydrangeas that bloom on new wood. This week’s topic will be on hydrangeas that bloom on ancient wood. Blooming on “old wood” refers to buds that will open on wood that was grown the season before. This means that these hydrangea kinds should be clipped in the middle of the summer, rather than in the early spring like the smooth and panicle variants.
Take note of when your hydrangea blooms to determine which kind you have. In contrast to hydrangeas that bloom on fresh wood in the middle to late summer, those that bloom on old wood frequently start blossoming in the early summer.
You can prune spent blooms just below the flower head and a couple of the oldest or longest stems near the soil line to keep the shrubs looking attractive. Pruning old canes, which frequently yield smaller blooms, will enhance the shrub’s beauty. For these varieties of hydrangeas, winter protection is essential.
The Oakleaf hydrangea is one type that blooms on aged wood (Hydrangea quercifolia). The oak-shaped foliage of the 5- to 8-foot-tall Oakleaf, which in the fall turns a stunning mahogany hue, gives the plant its name. With its browned blooms and lingering cinnamon-colored peeling bark in the winter, its grayish green foliage in the spring, and its deep green leaves and conical-shaped flowers that range in color from white to pink in the summer, this hydrangea offers visual pleasure throughout the entire year. A layer of mulch will aid in moisture retention, which is crucial to keeping the soil moist.
The climbing hydrangea is another variety of hydrangea that grows on old wood (Hydrangea petiolaris). These unusual woody vines grow quickly up any structure and don’t require a trellis because of their clinging behavior. They produce fragrant white lace-cap blooms and lovely leaves. These have a maximum length of 80 feet.
Some hydrangea varieties produce flowers on both young and aged wood. Consider the Bigleaf hydrangea (Hydrangea macrophylla) variations, such as the Let’s Dance and Endless Summer series. Pink, blue, or purple are some of the different flower colors, and in some kinds, the blossom color can be altered by altering the pH of the soil. The height of shrubs varies from 2 to 6 feet.
The Mountain variations (Hydrangea serrata), which include the Tuff Stuff series, are another variety of hydrangea that blooms on both old and new wood. This type is well-known for its mid-summer lace-cap flower clusters and fall-colored foliage that turns scarlet or burgundy. The Tiny Tuff Stuff is 1 1/2 feet tall, while the Tuff Stuff is 3 feet tall.
Should I prune my hydrangea’s dead wood?
Any landscape is more beautiful with hydrangeas. Both their huge, spectacular blooms and their beautiful foliage are attractive. Additionally resilient, resistant to disease and insects, and versatile, hydrangeas are. They thrive in a variety of soil types and can withstand moisture better than the majority of other woody plants. One disadvantage is that various cultivars require various pruning techniques, and many gardeners are unsure about when and how to trim them.
The earliest hydrangeas that flower before July are those that bloom on old wood from the previous year’s growth. Those that flower later in the season—after July—do so because blossom buds on newly developing wood from the current year are blooming.
A safe rule for all varieties of hydrangeas is that no pruning is preferable to improper trimming if you are unsure of the variety you have.
A straightforward strategy that works for all varieties of hydrangeas is to restrict pruning to:
- Winter-dead wood In the spring, trim off all dead branches just as the buds start to open. By using a knife to scrape the bark, you may check the stem for life. If the underside is not green, the plant is dead and needs to be removed.
- Rejuvenation
- Even the healthiest hydrangeas lose old wood. Remove old or dead stems by cutting them off at the plant’s base in the early spring. This will encourage new growth and result in a later in the summer more robust bloom set.
- wilted flowers The safest pruning technique is known as “dead-heading,” because it cannot be done incorrectly.
Bigleaf hydrangea (Hydrangeamacrophylla)
In Maryland, this variety of hydrangea is the most popular. It boasts big blue, pink, red, or purple flowers as well as lovely, shiny foliage. These hydrangeas come in two varieties: mophead and lacecap. Each is pruned in the same manner. The repeat bloomers, which bloom on both the old wood from the previous year and the wood from the current season, are also included in this category of hydrangeas. ‘Endless Summer’ is a well-known cultivar of the repeat bloomers, although there are also numerous more recent repeat flowering cultivars that are readily accessible.
Bigleaf hydrangeas may need to be pruned because they have grown too large. However, excessive pruning will significantly decrease or even stop flowering. After the blooming season, in the late summer, dried flowers can be removed. However, it’s better to hold off until early spring when new growth starts to appear to make sure you are just removing weak or dead sections and not live stems that have flower buds. Hard renewal pruning may be required for hydrangeas that are very old and in decline. All branches should be pruned back to the ground. The blossoms for that year will be lost as a result, but the following year should be very fruitful.
In the genus macrophylla, some well-known cultivars of distinction include “All Summer Beauty,” “Altona,” “Dooley,” “Europa,” and “Nikko Blue.” However, every season sees the introduction of new cultivars into the landscape industry.
The pH of the soil affects the macrophylla species’ flower color. Low pH results in blue blooms, while high pH results in pink or red flowers.
Smooth hydrangea (Hydrangea arborescens)
It is a common component of domestic landscapes and is a native of North American forests. This species is the simplest to prune because it produces white flowers on fresh wood from the current season. Simply give it a severe springtime trim. Cutting all stems back to around 12 inches from the soil line really promotes flowering. The cultivars “Annabelle” and “Grandiflora” are well-known examples.
Pee Gee hydrangea (Hydrangea paniculata)
This is one of the biggest hydrangeas and it comes from the East. It has a 25-foot height limit. Its fragile stems are susceptible to breaking under a weight of white flowers in windy conditions or under heavy snowfall. To maintain the plant’s vitality, cut off damaged stems as they appear. It also blooms on the wood of the current season, just as the smooth hydrangea. In fact, spring pruning will promote flowering and aid in controlling the plant’s size. Simply remove any damaged stems and spent blooms if the size is unimportant. The cultivars “Barbara,” “Bridal Veil,” “Brussels Lace,” “Chantilly Lace,” “Grandiflora,” and “Limelight” are among the best.
Oakleaf hydrangea (Hydrangea quercifolia)
Beautiful native to the Southeast of the United States, the oakleaf hydrangea is a favorite of many gardeners. Even without the huge, towering, 12-inch flowers, the foliage is magnificent. On old wood from the previous year’s growth, it produces its blossoms. It blossoms in Maryland in June, but the flowers last all summer and gradually transform from white to pink before turning tan in the winter. After flowering, if necessary, prune to preserve the desired size and shape. Deadwood from the winter can be cut down at any time.
Climbing hydrangea (Hydrangea anomala subsp. petiolaris)
This variety of trailing vine grows quickly, is appealing, and requires little upkeep. The only pruning required is to cut off stray stems that are not wanted to regulate their growth. As the vine quickly produces new stems, you might need to repeat this process multiple times throughout the season. It blooms in April and May on old wood from the previous year in central Maryland. After blooming, prune them to prevent diminishing bloom.
What occurs if your hydrangeas aren’t 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. However, feel free to cut blooms for arrangements or remove the blooms when spent. When we refer to “pruning,” we indicate more invasive cutting to maintain shape or to remove dead growth.
Hydrangeas can bloom on either fresh or old wood, depending on the species, and whether or not you prune them depends on which wood they bloom on.
There are four varieties of hydrangeas in our area that bloom on old wood, and they are not limited to the colors shown here. If you leave them alone, they’ll bloom more profusely the next season. However, go ahead and gently thin or deadhead. Just remember new growth may come, but that new growth will be without blooms next season.
Refrain from removing the dormant growth on your wall or trellis. Climb by way of suckers.
The flower heads are more cone-shaped, and the leaves turn red-orange in the fall, which is a pleasant surprise for a hydrangea.
They are very comparable to lacecap types, but smaller and with more compact leaves.
There are two varieties of hydrangeas in our area that bloom on new wood, and they are not limited to the colors shown. They require pruning in late winter or early spring. Prune to shape, cutting back to about two feet. The pruning encourages new, sturdy growth, which provides the blooms the following season.
Keep the blossoms on during the winter for interest; they look particularly attractive when dried out. Cone-shaped blooms, but does not contain Oakleaf variants.
They are normally white, have smaller blooms and leaves than Bigleaf variants, are thought to be a wild type, can grow to be quite tall, and prefer full light.
Remember that well-draining soil and good organic fertilizer goes a long way to promoting beautiful blooms on a sturdy shrub. Stop in and we’ll point you in the right direction to grow your green thumb. Now that you know whether or when to prune, you can avoid the frustration of a hydrangea that doesn’t bloom.
Cut back these shrubs in late winter before new growth begins
Shrubs that flower on young wood typically start blooming later than old-growth bloomers, beginning in June and continuing until the first frost, because they need to grow and set buds the same year that they bloom. As long as you avoid trimming when the flower buds are opening, these shrubs are understanding if it is not done at a specific period.
1. Trim the flowers all the way back for larger blooms.
These bushes can be completely removed from the ground in late winter or the beginning of spring. If cut severely like this every year, smooth hydrangeas will produce much larger flowers, but many gardeners prefer smaller blooms on stronger stems.
2. Maintain an old growth foundation to lessen flopping
Especially after watering from above or after a heavy storm, the branches of some hydrangeas frequently topple over from the weight of their blooms. Cutting the stems to a height of 18 to 24 inches will help to reduce this flopping by creating a strong framework for fresh growth.
Janet Carson is the University of Arkansas Cooperative Extension Service’s horticulture specialist.
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Should I remove the brown blooms on my hydrangea?
Your hydrangea shrubs’ blossoms appear to be withering or turning brown. No need to worry—this is merely a signal that it’s time to deadhead—remove the blossoms from the plant.
Deadheading hydrangeas doesn’t cause any damage to the plants at all. Flowering shrubs stop producing seeds when the spent blooms are removed, and instead focus their efforts on developing their roots and leaves. You will be doing your hydrangeas a favor by deadheading because this strengthens and makes plants healthier.