Regular pruning might simply include any shaping you choose to undertake along with the removal of dead, diseased, or broken stems for any lilac shrubs that have not outgrown their space or are still producing bright flowers every year. You can also prune your lilacs’ spent blossoms to promote a neater growth pattern and appearance. Instead of shearing, it is always preferable to perform this kind of pruning by hand. Try to cut back to a bud that is facing outward while making cuttings. The best instrument for this is a decent set of hand pruners, which provide considerably superior pruning cuts than hedge shears.
A lilac bush can be trained.
Lilacs should be trained as trees from the beginning for optimal results. When young plants are quiescent, remove all lower branches and all other stems that are emerging from the soil, leaving only the whip. Between shin and knee height, cutting the whip low fosters the growth of several upright branches.
As the tree matures, a robust lower trunk with numerous strong leaders forms. An appealing tree with an open, rounded shape is produced by removing leaders to encourage them to rebranch and keeping sprouts and lower growth thoroughly removed. A topiary standard tree is produced by raising the whip’s termination point and maintaining a compact top growth.
How should an overgrown lilac bush be pruned?
Cutting off the tops of stems that have grown out of control is frequently insufficient when pruning lilacs. It is typically preferable to remove the entire stem. The best way to trim lilacs is with clippers. To avoid spreading and promote later blooms, remove spent blossoms right down to the stems. Three-quarters of the branches should be pruned. Remove any shoots that are emerging from the main trunk and are growing close to the ground. Lilacs within the inner branches may need to be trimmed in order to increase air flow or let more light through.
However, it may be essential to prune the entire bush or tree to approximately 6 or 8 inches (15-20 cm) above the ground if lilac shrubs are already too big or starting to look unpleasant. Remember that it takes around three years for flowers to grow after the entire bush has been removed, so you might have to wait.
How do you prevent lilacs from growing too long?
Choosing the proper variety is the first step in effective lilac cultivation. Lilacs typically grow in USDA plant hardiness zones 3 through 7, while certain varieties can also withstand USDA zone 8. In USDA zones 8 and 9, the Descanso hybrids, such as “Lavender Lady” (Syringa vulgaris x Syringa laciniata “Lavender Lady”), flourish. Annual pruning in late winter or early spring is required to avoid legginess. One-third of the plant’s stems should be pruned back to the ground, and any weak or dead branches should be removed. To promote bushiness and an abundance of flowers, cut the remaining stems to the strong side shoots.
How much may a lilac shrub be pruned back?
Cutting no more than a third of the stems from a shrub should be the general guideline when pruning it. While a result, the plant will continue to thrive and grow new stems as the old ones bloom. Your aim is to grow a lilac bush with between eight and twelve stems, all between one and two inches in diameter, and of varying ages.
Prune Unsightly Features
Pruning should start with the removal of diseased, dead, and pencil-thin suckers and twiggy growth. Trim these all the way to the ground. These stems are typically handled by pruning shears or loppers.
Remove Any Stems Thicker Than 2 Inches in Diameter
By routinely removing entire old stems, you can keep your lilac from growing too tall. Removing only the tops of lengthy stems might cause the plant to take on an unusual, unnatural shape. A pruning saw could be essential for stems that are quite large. It can be difficult to handle thick lilac stalks.
Prune Remaining New Stems
Pruning the remaining new stems to an outward-facing bud will encourage your lilac to fill out more and develop a shrubby appearance. This entails trimming just past buds that point away from the plant’s core. A denser shrub will result from this technique’s increased branching.
How much may a lilac bush be pruned?
Never remove more than one-third of a shrub’s stems in a single pruning season for lilacs. I just cut the branches of the lilac tree down to a manageable height when they started to stray too close to the eaves. After trimming the dead blossoms, I decided to call it a day. A little minor thinning might also be done to promote new growth.
In late winter or early spring, a more vigorous pruning should be performed, perhaps on older shrubs that haven’t been routinely tended to. At this time, you should remove any old wood and damaged stems while keeping the more recent growth. Reduce the aging stems to the ground.
I’ll simply cut any very long sections off the Bloomerang lilac to keep the shrub’s form. Because bloomerangs naturally have a spherical habit, you don’t need to bother about sculpting the bush too much. My plant has been in the garden for a while and is still adorable and manageable.
Can you make a tree out of a lilac bush?
You require a little tree to serve as the garden’s centerpiece. Instead, pick a shrub and utilize basic pruning methods to turn it from a bush into a lovely tree. You can produce a unique plant that adds a touch of class to your yard when you prune a shrub into a little tree. For this method to work, you don’t even need to be an expert in plants or good with pruners.
The greatest shrubs to grow into trees are those that don’t normally produce a lot of suckers from the roots (suckers). Numerous varieties of shrubs, from floral beauties to shrubs with fall color, are included in this group. Lilac, flowering quince, panicle hydrangea (Hydrangea paniculata), and spring-blooming star magnolia are some examples of flowering shrubs that can grow into trees (Magnolia stellata).
Many berried bushes grow into lovely little trees that provide the garden winter appeal. Pyracantha, Siebold viburnum (Viburnum sieboldii), and sea buckthorn are members of this group (Hippophae rhamnoides). Another excellent shrub to grow into a small tree is cotoneaster. Choose upright cotoneaster cultivars like Cotoneaster divaricatus or Peking cotoneaster (Cotoneaster ludicus) for the best results.
Sucker-producing shrubs are the most challenging to grow into trees. These suckers typically grow in small thickets when left to their own devices. Elderberry, chokecherry, and red twig dogwood are shrubs that can produce thickets. These shrubs can be trained to grow into tiny trees; however, it could require a bit more work.
Pruning suckering shrubs into multi-stemmed trees, where you choose a number of upright stems to act as trunks, is an option. For a beautiful multi-stemmed little tree, try the bottlebrush poinciana or pineapple guava in warmer climates. Consider witch hazel, serviceberry, or imitation orange in regions with chilly winters.
Smaller plants are simpler to teach when selecting shrubs to grow into trees. Gardening isn’t just about growing bushes into trees right away. It takes years to complete the process. Start with a plant that is around a year old if you wish to train your shrub into a tiny tree with a single trunk. One to two gallons may be used for a container. When grown as a multi-trunked tree, more mature shrubs produce better results.
Prior to planting, decide which stem will serve as the tree’s trunk. Remove branches from the shrub’s bottom third after planting. Place a sturdy stake next to the main stem, such as a tree stake or a chunk of rebar. On a tree with multiple stems, place a stake for each one. Fix the stem to the base with a tie. Rub out or trim any little sprouts that develop along the trunk as the shrub grows.
Remove lower branches each spring so that the trunk makes up one-third of the tree’s height. Till the tree reaches the desired height, repeat this technique every spring. Then, reduce the canopy to three to five major branches, then prune those branches back by three to five inches to promote branching. Thin the canopy as necessary and cut off any branches that sprout along the trunk to maintain your shrub-tree.
How can a lilac bush be trained?
Most gardens benefit from having a lilac shrub because it adds color and smell early in the growing season. It requires little maintenance, adapts to its environment—whether it’s sunny or shady, moist or dry—and gives pollinators nectar in the early growing season. However, if you want a bush that continues to bloom beautifully and look nice after 5 or 6 years, it needs some care. It’s obvious that my aged and neglected lilac bush needs some care.
The common lilac (Syringa vulgaris), which was originally from Asia and was introduced to the United States in the 1700s, looks best in a well-kept cottage garden or as a riotous hedge. It is not a good fit for my native garden.
Each year in the spring, it blooms with lovely, fragrant flowers and lush, green leaves just as I’m about to remove it. Then I suppose I should relocate it to a slightly less wild spot. The choice was aided by some study.
Lilacs may grow anywhere, but a sunny environment produces the greatest blooms. My shrub would thrive in a different location since its present location is quite shady. But neither transferring it nor getting rid of it entirely is a wise idea.
Lilacs have large, difficult-to-move root balls, and any roots that are left behind will produce new plants. The shrub needs to stay where it is unless I want a large excavating project or lilac sprouts all over the yard.
A prettier and healthier bush will result from establishing a yearly maintenance schedule. Since it blooms in the spring, it is preferable to prune this shrub as soon as the flowers have passed away and before the buds for the following year have formed. Trim the shape, remove leaves and branches that are sickly, and deadhead the blooms.
Older stems should periodically be thinned to promote flowering and prevent the blooms from falling too far. Garden Notes No. 619 from the Colorado State University Extension Office contains thorough information on pruning and an excellent image of what not to do.
If the flower bed is expanded with more spring bloomers, a lilac bush might look more lovely. Daffodils, tulips, and hyacinths are excellent companion plants since they are equally adaptable and beautiful in the spring.
By taking generous cuttings while it is in bloom and the air is fragrant, I’ve made peace with my lilac bush and am working to improve its appearance. The bush can be managed with routine pruning, but only after I’ve had a chance to enjoy its flowers both inside and out.
Vicky Barney, a member of the 2011 Master Gardener Class, cultivates gardens for animals.
What can I do with a lilac shrub that is overgrown?
The common purple lilac is a hardy, dependable shrub that can grow up to 20 feet tall. Unfortunately, the lower, shady sections of lilac shrubs typically lose their leaves as they get older. Large, overgrown specimens as a result are frequently leggy and ugly. Pruning can restore or rejuvenate old, neglected lilacs. Home gardeners have two alternative pruning techniques to pick from.
Cutting the entire plant back to within 6 to 8 inches of the ground in late winter is one method of renewing a huge, overgrown lilac (March or early April). A significant number of shoots will sprout during the growth season as a result of this aggressive pruning. Select a few sturdy, robust shoots to construct the shrub’s framework, keeping a few of them, and cut off all the others at ground level in the late winter of the next year. To promote branching, head (clip) back the retained shoots to just above a bud.
Cutting back the overgrown shrubs over a three-year period is a second method for pruning mature lilacs. In late January, start the process by digging up and removing one-third of the big, old stems. The following year, trim out half of the remaining old stems (again in late winter). Additionally, trim out some of the recent growth. Keep a few healthy stems that are evenly spaced apart and cut off the rest. In the third year’s late winter, completely remove all of the old wood. It is also necessary to thin the fresh shoots more. This pruning technique should enable you to take pleasure in blossoms every spring because lilac wood must be three years or older before it blooms.
Within a few years, with the right pruning, an old, overgrown lilac can be converted into a robust, appealing shrub. Pruning should be a frequent component of the lilacs’ management regimen after they have been revived. By cutting a few of the oldest branches every three to five years, the shrub can be kept strong and healthy.
(This article, which first published in the Sunday edition of the Lincoln Journal Star Newspaper in February 2005, has since been amended. Consult the Terms of Use for details on how to copy this content and use any images or visuals.)
Zones:
The majority of lilac types can withstand cold temperatures in zones 3 to 8, although others, like Scentara Double Blue, can (S. hyacinthiflora). There are some cultivars that don’t require a winter chill, like as “Lavender Lady” (S. vulgaris), which is heat tolerant to zone 9. The majority of others do need a wintertime period of cold and dormancy.
Height/Spread:
The common lilac, Syringa vulgaris, reaches heights of 12 to 15 feet and widths of 10 to 12 feet. The majority of dwarf types are smaller and reach maturity at 4 to 6 feet tall and 3 to 7 feet broad. Syringa reticulata, often known as the Japanese tree lilac, grows up to 30 feet tall.
Bloom Time:
The majority bloom in late May, however there are new re-blooming kinds, such the Bloomerang series, as well as early spring, mid-spring, and late-season blooming variants.
Color:
The common lilac (Syringa vulgaris) has gray to gray-brown bark, purple blooms, and dark gray-green to blue-green foliage (with no fall color change). But there are actually seven recognized hues for lilac flowers: white, violet, blue, lavender, pink, magenta, and purple, with several variations of each hue.
Other:
True lilacs, such as the California, mountain, and wild lilacs, are truly members of the genus Ceanothus. Butterfly bushes are frequently referred to as summer lilacs, especially sterile and non-invasive varieties.
Can you prune a mature lilac bush?
Then climb your ladder and trim down all of the branches and the spent lilac flowering heads by a few feet. This will even out the bush. Remove any unhealthy portions as well by pruning.
After blooming the following year, trim a further third of the oldest branches. And trim back the final group of eldest branches in year three. Your plant will be rejuvenated by the three years of trimming out the old wood. Ideally, you’ll have fresh, bushy growth closer to the ground as well as blossoms that you can cut or smell without using a ladder.
Rhododendrons should have their spent flowers removed every year once they have faded. Just the flower heads, and not the leaf stalks, should be snapped off. You can revive elderly shrubs that have become spindly by giving them a lot of trimming. In order to avoid interfering with the development of flower buds for the next year, the best time to prune these plants is right after flowering (late spring).