A panicle hydrangea may have been sold to you as a shrub, a plant with a raised head known as a tree form, or another kind “according to a nursery industry standard. The same pruning techniques apply to both.
The best time to prune is in the early spring, when the first green shoots begin to emerge but the risk of frost has passed.
How to prune: When you notice those green eyes poking out from the branches in the early spring, that’s when you should start pruning. Take out your bypass pruners because it’s time to chop! The buds on these plants are opposite (buds that form opposite to each other along the stems). Determine which sets are virtually parallel to the ground before beginning to prune ” (basically one “eye is pointing up toward the sky, and the other is pointing down). You’ll be pruning back to these buds because doing so pushes the plant to develop outward rather than inward, which would crowd out the interior of the plant. The goal is to take out about a third of the entire plant. To do this, prune back each branch that emerges from the main trunk while making sure to leave at least three sets of buds remain. More plant pruning, especially while the plant is young, could severely limit development and the flower display. Your plants should ultimately resemble coat racks or deer antlers. Don’t panic if you find yourself cutting quite deeply into wood that is only the size of your thumb in some instances. This is not harmful.
Remove one of the two opposite buds that will push where your pruning cut was made to produce larger flowers (but fewer overall). Wait until the stems that grow from these buds are approximately 6 inches long. Leave the outer buds on if you want more smaller flowers.
Buds will start to form on the inside of the plant a little later in the spring. Just use your fingers to pull them off. In order to create enormous flowers, these inner buds will deplete some of the plant’s resources. Additionally, they will cram the inside plant by pushing branches inside. It’s simpler to handle the issue now with just your fingers than to have to use a tool later to cut these branches off.
When should my panicle hydrangea be pruned?
Pruning is a difficult chore, particularly if your shrub is really large. The best techniques for pruning a Panicle Hydrangea are demonstrated to you by Brandon, Ashcombe’s Nursery Manager. Please be aware of the type of Hydrangea you are working with before attempting to use these advice; they may not apply to other varieties.
The preferred tools for this task are hand pruners and loppers. The pruning procedure will go more smoothly if both are available. Make sure the equipment is clean. Tools that are dirty might spread diseases from one plant to another. Brandon advises cleaning with rubbing alcohol. Either dunk your instruments in the rubbing alcohol or rub the blades with a towel that has been dampened with the solvent. Before use, sharpen your tools. For smaller cuts close to the top of the shrub, hand pruners work best; loppers are used later, when you get to the bottom.
How you prune depends on why you’re doing it. Brandon is trimming a shrub that has outgrown its current location since it has gotten too huge. When trimming, keep in mind that the area you pruned will grow 4 feet the next season. Brandon wants to reduce the size of this plant and increase the size of its blossoms.
Make your selection for where to prune using your pruning shears. How much growth you observe in the following growing season depends depend on where you prune. To guarantee growth in the following season, always trim above a bud set. To make this shrub smaller and encourage fewer but larger blooms, Brandon will cut it back to the bud sets, which are about a foot off the ground.
In the growth season, you will observe more blooms, albeit they will be smaller, the higher up the shrub you trim. You can also deadhead the plant just before the next bud forms on each branch to encourage more and smaller blooms. Just remove the flower to restructure the bush and promote numerous, smaller blooms.
Brandon may regulate the size and number of blooms on this plant by trimming the shrub to a height of about a foot from the ground.
How should a panicle hydrangea be cared for?
Panicle hydrangeas are the most sun-tolerant hydrangeas, and in cooler locations (like USDA zones 3-6), we advise at least four hours of full sunlight each day; six or more is desirable since it promotes the healthiest stems and the most flowers. Even though the plants should receive at least some sun each day, afternoon shade is advantageous in hotter locations (USDA zone 7 and warmer).
Panicle hydrangeas are generally not picky about soil, but excellent drainage is essential. Avoid growing them in any region where it is consistently damp because this can cause root rot. Other than that, any common soil in your garden would do. Even clay soil can support their growth if it is well-drained. As a result, unless you reside in a region with extremely acidic or alkaline soil, you shouldn’t need to make any adjustments to successfully produce panicle hydrangeas.
When planting panicle hydrangeas, avoid adding any soil amendments. When planting in the ground, don’t fill the hole with any type of compost, potting mix, top soil, etc. This results in something known as the “bathtub effect: When you add an amendment, water seeps in very quickly, but as it drains and contacts the surrounding native soil, it slows to a stop. It remains around the roots throughout this time, making them vulnerable to rot. This is the number one reason we’ve observed that recently planted panicle hydrangeas could struggle, so it bears reiterating here even though it is our advise for planting all of our shrubs. Make life simple for you and your new plant by planting just into your natural soil, watering immediately after planting, and mulching with 2-3/5-7 cm of finely chopped bark.
Panicle hydrangeas require constant watering throughout their first year or two of growth, much like any freshly planted shrub or tree. They can tolerate dry circumstances after they are established, but very hot, dry weather might hinder blooming, thus regular watering is advised for the most and prettiest flowers.
Panicle hydrangeas typically don’t need to be fertilized on a regular basis. A springtime application of a granular shrub fertilizer (like a rose fertilizer) will do if you want them to grow more swiftly. Avoid over-fertilizing panicle hydrangeas as this can result in brittle stems. Be especially cautious of inadvertent fertilizer, such as that provided to a neighboring grass or flower bed, as they frequently contain high nitrogen levels and are more likely to promote weak stems through quick, soft growth.
“The word “panicle” refers to the plant’s blossoms’ arrangement and shape, although it’s best to picture them as about football-shaped (and large!). In zones 8/9, mid-late April is when they blossom. The blooms begin the summer season white, but as the season progresses, the days begin to grow shorter and the nights become cooler, the blossoms begin to take on pink to red tones. The specific hue will vary according on the variety; some may completely change color, while others will do so gradually, creating a multicolored shaded impression. Muddy-colored blossoms often signal that the plant is receiving too much shadow and/or that temperatures, especially at night, have been too hot.
The color that the blooms take on is a genetic feature that emerges with the normal aging of the floret cells and is unaffected by any soil factor, such as pH level. Panicle hydrangeas’ color cannot be altered by growing them in acidic soil or applying aluminum sulfate; they will always remain in the pink/red spectrum.
Panicle hydrangeas require little to no winter care because they can withstand freezing temperatures so well. It is ready to withstand the next cold, ice, snow, and wind as long as a thick 2-3/5-7cm layer of mulch is over the roots.
On fresh wood, panicle hydrangeas blossom.
In other words, they don’t start producing flower buds until the spring, once they’ve started to leaf out. This means that pruning them won’t have an adverse effect on how well they bloom. Despite not being strictly essential, pruning promotes stronger stems, better blooming, and an all-around more beautiful shape. Keep trimming to a minimum while the plant is still young and hasn’t had a chance to grow a strong body if you are starting with a very small plant, like one you bought online.
When to prune: Panicle hydrangeas can either be pruned in early spring, right as the new growth starts to emerge, or in late fall, after the plant has completely gone dormant (i.e., has shed all of its leaves and has been bare for at least two weeks). Aim to reduce the plant by roughly one-third of its total height, or roughly 2′ if it is 6′ tall. You should also remove any side branches and thin, spindly stems. For more advice on caring for and pruning panicle hydrangea trees, sometimes referred to as standard or tree-form hydrangeas, check our article.
How are panicle hydrangeas 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.
How should a limelight panicle hydrangea be pruned?
Simply remove one-third of the Limelight Hydrangea’s overall height when pruning it. Before new growth appears, prune your Limelight in the late winter or early spring. You don’t want to possibly take off any flower buds for the future season because this shrub blooms on fresh wood. Additionally, you can remove any unhealthy or dead branches as needed throughout the year. By being pruned, this shrub develops a sturdy base and upright branches that are able to support all of the big flower heads. Additionally, it stimulates the plant to focus more of its energy on producing flowers, which bloom from June to September.
This shrub can also be trained to grow into a tree. Your neighbors will be amazed when they see this unusual creature! We especially enjoy seeing these developed into trees in garden planters since it simultaneously provides height and beauty.
Should panicle hydrangeas be deadheaded?
To keep your hydrangeas looking their best and promote the development of new flowers, deadhead regularly during the blooming season.
But in mid- to late-fall, stop deadheading hydrangea shrubs, leaving any spent blooms in situ. This not only adds beauty to the winter landscape but also guarantees that the buds that will bloom the following spring are not removed.
What kind of plant is a panicle hydrangea?
The panicle hydrangea is a hardy plant. The flowers are arranged in clusters, resembling large lilacs. They are initially green or white, but as they get older, the majority develop a pleasant pink tinge. Even in the winter, panicle hydrangeas look beautiful!
Many customers ask why their hydrangeas aren’t blooming. The primary reasons hydrangeas don’t bloom are incorrect pruning, bud damage due to winter and/or early spring weather, location and too much fertilizer.
There are hydrangea kinds that bloom on either fresh or old wood, or even both. Both new and old wood are the growth of the following year (spring), respectively.
- Consider that this year, you bought a Nikko Blue Hydrangea. For the next year, Nikko’s produce blooms in the fall. Your Nikko is therefore creating blooms this fall that will blossom in the spring.
- Therefore, you wouldn’t want to completely prune your Nikko Blue Hydrangea this fall while you are pruning your perennials. Pruning the Nikko Blue Hydrangea this fall would effectively mean cutting off your hydrangea flowers for the upcoming spring.
- The idea behind Endless Summer, a hydrangea variety that blooms on both old and new wood, is that the plant will set blooms this fall to blossom not only in the spring of the following year, but will also keep producing blooms in the spring of the following year to extend the blossoms into the summer.
- Once more, pruning your Endless Summer hydrangea in the fall would mean removing some of the flowers that would blossom in the spring.
The hydrangea’s plant tag will indicate whether it blooms on fresh wood, old wood, or both. It is typically preferable to wait until spring to prune your hydrangeas. As the plant grows, you’ll see stems that are fragile when bent and lack any leaves. Since these stems are dead and won’t produce any flowers, they should be clipped close to the plant’s base.
The second reason why your hydrangeas aren’t blooming is probably the weather. Buds of hydrangeas are extremely susceptible to cold. Therefore, it is a good idea to wrap your hydrangea for the winter if it is an old wood hydrangea. Keep in mind that old wood hydrangeas establish their blooms for the following spring in the fall. Therefore, you won’t have blossoms in the spring if the fall-produced buds are frozen in the winter.
You can wrap anything with regular burlap. Burlap should be wrapped around the plant and filled with mulch or leaves after the first hard frost and after the hydrangea’s leaves have dropped. In order for the buds to survive the winter and sprout the following spring, the plant receives insulation from this. Never wrap your hydrangeas in plastic. When warmer winter days arrive, the plant cannot breathe since plastic, unlike burlap, doesn’t breathe. As a result, the plant can heated to such high temperatures that it cooks within the plastic and perishes.
The second most frequent weather-related cause hydrangeas do not blossom is late spring killing frosts. We saw really chilly temperatures in April both this year and last year after beautiful spring days. When springtime temperatures drop below freezing, hydrangeas need to be covered with an old beach towel or sheet. Because of the temperature dip, there won’t be any blossoms.
The majority of hydrangeas require at least 3 to 4 hours of light per day to bloom. The best light is in the early morning, midday light is acceptable if it is dabbled light rather than beating sun, and afternoon sun is typically too hot. Check the plant label, though. Newer hydrangea cultivars are being created that can withstand more sun exposure time and sun intensity. A hydrangea in full sun will require much more watering than one in diffused light, so keep that in mind.
High nitrogen fertilizer should not be used to feed hydrangeas. Nitrogen is indicated by the first number on the fertilizer ratio. (The ratio stands for N, P, and K) For healthy leaves and general good growth, some nitrogen (N) is required; however, a ratio of 8-16-6 or any similar combination with a higher middle or phosphorus (P) value is preferred. The growth of roots and shoots is encouraged by phosphorus, which improves the blooming process.
Potash (K), the third element’s last quantity and the lowest ratio, is for plant hardiness. Because hydrangeas prefer acidic soil, they can be fertilized with fertilizers designed for such plants. Hydrangeas only require fertilizing twice a year, once in early spring and once in mid-summer. To avoid root burn, make sure the soil is always moist before applying a fertilizer.