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.
Should lilacs be staked?
Watering Except for when they are newly planted, during times of drought, or in the late fall before the ground freezes for the winter, common lilacs rarely require watering. Water liberally during these times, wetting the ground completely. In order to keep the mildew-prone lilac leaves dry, it is advisable to use a soaker hose system or dripping garden hose that waters the soil directly. Mulch will help the soil at the shrub’s base retain moisture for a longer period of time. Only when there is a severe drought do older, well-established bushes require watering. See the document on Choosing Watering Equipment for additional details.
Fertilizing Lilacs that are older and growing in organically rich soil do not require further feeding. However, until they are firmly established, young, newly planted shrubs benefit from fertilizing for a few years. Spread 2 cups of a general-purpose, slow-acting granular fertilizer around the base of the lilac and allow it to soak in with the subsequent rain. Do this about every other year. Avoid going beyond since too much nitrogen will encourage the growth of masses of foliage at the expense of flowers. After a number of years, the organic mulch layers at the base of the plant will decompose, enhancing the soil, which should then be fertile enough to maintain lilacs without additional feeding. See the document on choosing fertilizer for additional details.
Mulching To help keep the soil underneath your lilacs moist and deter weeds, spread and maintain a 2 to 3-inch layer of organic mulch on top of the soil. As your soil decomposes, chopped leaves, bark chips, or wood chips applied to the tips of the branches (dripline) can condition it and add vital organic matter to aid in proper drainage. To avoid stem rot and rat damage, keep the mulch about 6 inches from the base of the shrub stems. The soil will be protected from the regular temperature changes that heave soil and occasionally disrupt plant roots by a somewhat thicker mulch layer in the winter. Lilacs are additionally shielded by this or a living mulch like ivy, pachysandra, or other groundcover plants from harm from mechanical yard care equipment. Avoid using uncut leaves as a mulch because they bind together and stop water from penetrating the soil.
Note: If you apply lawn herbicides such 2,4-D chemicals on turf close to shallow lilac roots, the leaves may thicken, curl, and eventually die. Lilac shrubs can be shielded from this by having a ring of mulch around the base that is at least as broad as the shrub. Check out the file on Using Mulch for further details.
Pruning/Grooming Lilacs should not be pruned for the first three to four years to allow them to grow multiple robust stems from the base. Then, to preserve a regular bloom sequence (lilacs bloom on the wood from the previous year), prune at least every three years in late spring right after they bloom. In order to stop dead flowers from going to seed, now is also the time to cut them off. During the winter, suckers and weak wood that won’t produce flower buds can be cut out. With a pruning saw, remove any extra stems, especially older ones that are thicker than 2 inches, to enhance airflow and the amount of light available to the leaves. When it appears, remove any wood that is dead or infected.
If a lilac shrub has grown so tall that the blooms are out of sight, prune back a few branches each year (do only a few because they won’t bloom again the following season) to encourage the bush to spread out on lower branches. Remove any suckers that are sprouting from the graft union of a grafted lilac in order to keep the understock from taking over and obstructing the true branches. Cut old plants to just 6 inches above the ground to give them new life. In two to three years, they will pleasantly return. Choosing Pruning Tools and Pruning Shrubs
Staking If there is a danger that newly planted lilac shrubs will be blown over or uprooted before they get established, stake them. Place research supports are evenly spaced about two feet outside of the dripline of the lilac. Three is typically enough. The main stem of a young shrub should have soft clothesline or cables covered in rubberized protection at the point where they meet the lilac bark. These should then be tied to the supporting stakes. Put only light stress on the lines; the stem has to be able to move a little so that it can strengthen itself. Make frequent checks to ensure that the cables are not impinging on or harming the trunk in any manner. Once the roots are firmly established, which should take about 6 months, remove staking.
How do you manage a lilac plant?
One of the joys of spring is the luscious aroma of lilacs. The lilac bush, which blooms in late April or early May with clusters of tiny purple flowers resembling bunches of grapes, is a common sight in most communities.
These are primarily common lilac shrubs (Syringa vulgaris). Kris Bachtell, vice president of collections at the Morton Arboretum in Lisle, described it as “grandma’s lilac.” It is widely known.
He said that there are hundreds of cultivated types. Although there are cultivars with magenta, pink, and white blooms as well, the majority bloom in hues of purple. They are all resilient and enduring.
Despite being widely cultivated, common lilac is difficult for some gardeners to grow. Even if some newer types are more resistant to powdery mildew, older ones are frequently deformed by it in the late summer.
The plants, which are native to rocky Balkan hillside soil, require full light and well-drained soil. An older lilac’s blooming cycle may end if nearby trees have grown to shade it.
Lilacs require frequent renewal trimming to reduce their size and thin them out. According to Bachtell, this necessitates the yearly removal of certain elder stems as well as dead wood. Lilacs also frequently sprout suckers from their root systems, which may need to be cut back.
The common lilac can simply be too much of a shrub for smaller yards because it is a large shrub or small tree that grows 8 to 20 feet tall and almost as wide.
Fortunately, Bachtell says, there are alternatives. “He said that several other lilac species are somewhat smaller. “They might be more disease- and shade-tolerant than grandma’s.
Meyer lilacs (Syringa meyeri) can reach heights and widths of 6 to 8 feet. Even though it thrives in direct sunlight, it can tolerate some shade. The flower clusters are smaller but very fragrant, and they emerge a little later than those of the common lilac. Autumn causes the leaves to become yellow. Although there are various cultivars, Palibin is the most popular.
One cultivar, Miss Kim, of the Manchurian lilac (Syringa patula), is primarily recognized. On a plant that is 5 to 8 feet tall, it bears delightfully scented light purple blossoms that turn light pink as they age. In the fall, the ruffled leaves become purple-red. Compared to other garden lilacs, the plant is a little more resistant to powdery mildew.
Hybrid lilacs that rebloom in the late summer or early fall do so less profusely than they do in the spring. Bloomerang Purple (Syringa ‘Penda’), Bloomerang Dark Purple (Syringa x ‘SMSJBP7’), and Bloomerang Dwarf Pink (Syringa x ‘SMNJRPI’) are just a few cultivars in the Bloomerang line. They are all smaller than typical lilacs, although cultivar differences in size should be noted on the label.
According to Bachtell, pruning should be done in the first week or two after the spring shrub has stopped flowering if it’s necessary to keep a lilac untangled and at the right size. Pruning in the winter will destroy buds that might otherwise develop fragrant blooms since lilacs bloom from buds that were formed the previous year.
Why do my lilacs keep toppling over?
This shrub could be staked, but it’s important to determine what caused it to topple over. It appears too close to the hedge and top-heavy. Maybe there isn’t enough light, food, or space for roots. In such confined spaces, an evergreen hedge will undoubtedly compete with the lilac. Think about chopping or shifting the shrub. Ask any follow-up questions after reading this OSU Extension article about pruning lilacs. Lilacs should be pruned as soon as they bloom, according to the website extension.oregonstate.edu/gardening/prune-lilacs-as-soon-as-they-bloom.
What distinguishes a lilac bush from a lilac tree?
Lilac bushes (also known as shrubs) are characterized by their numerous woody stems that emerge from the plant’s base. In contrast, the trunk of the majority of lilac trees is the only woody stem. However, your neighborhood garden center might also sell shrub lilacs that have been grafted onto a single stem to give them the appearance of miniature trees.
The choice between a lilac tree and a lilac bush is typically determined by the amount of space available. Lilac bushes come in a range of sizes and can be placed in more compact areas of a garden. A lilac tree requires space to reach heights of 20 feet and widths of 15 feet. Both require sunlight to bloom well.
How can I aid a Bush who is leaning?
On either side of the bush, hammer two stakes into the ground. Attach a piece of sturdy, smooth wire to one of the posts, and then pass the wire through some used rubber hose. The wire’s free end should be secured to the second stake by wrapping the hose carrying it around the bush’s trunk or main stem.
Can lilacs be severely pruned?
A: There are a number of potential causes for your lilac’s failure to bloom. The two most frequent culprits are insufficient sunlight and poor pruning. Lilacs (Syringa) should be planted in an area with at least six hours of direct, bright sunlight per day. They can withstand a wide range of moisture levels as long as they are grown in soil with good drainage. If your lilac is clipped at the wrong time of year, it might not blossom for another reason. Lilacs bloom in the spring on the growth from the previous year, and soon after, they begin to form the buds for the following year. Within a couple of weeks of the plant blooming, pruning must be done in order to prevent the removal of the buds for the next year. You can softly clip young lilacs to keep them in check, within boundaries, and flowering profusely. In order to revitalize older plants and increase flower production, a rigorous pruning almost to the ground may be necessary. A late freeze can harm flower buds on types that bloom early.
Lilacs have a tendency to mature into overgrown, leggy shrubs with minimal foliage at the bottom. When this occurs, it might be required to prune them to within 12 inches of the ground in order to completely rejuvenate them. When the shrubs are dormant in late winter, this should be done. Lilacs benefit from this repair, although their blooming cycle will be hampered for at least one season. Lilacs can receive a rejuvenation pruning over a two-year period to stop the interruption of bloom cycles. One year, hard prune half of the shrub’s stems; the following year, hard prune the remaining stems.
Lilacs do not consume a lot of food. Excessive fertilization, particularly nitrogen fertilizer, can frequently promote luxuriant vegetative growth at the expense of flower development. The number of blossoms won’t increase with fertilization. A lilac’s failure to bloom could potentially be due to its proximity to turf that receives frequent fertilization.
Which month should lilac bushes be pruned?
All lilacs should generally be clipped right away in the spring after they have finished blooming. Lilacs set their flower buds for the following year immediately after the current year’s flowers have faded, therefore trimming later in the summer or fall will result in the removal of most or all of the blossoms for the following year. The larger common lilacs as well as the shorter or more “shrub like” cultivars are all subject to this timing guideline. While the “when” of lilac trimming is rather simple, the “how” is a little more difficult. For the time being, we’ll refer to lilac pruning as either maintenance pruning or rejuvenation pruning to keep things simple.
How far can I prune the rear of a lilac bush?
Older lilacs only bloom on the tallest branches and can have stems as thick as small trees. Fortunately, rejuvenation pruning can bring back a lilac that has been dead for around three years. There are two options available to you.
Using the “third” method is a less harsh way to pull an out-of-control lilac back into shape. For three years in a row, completely remove a third of the oldest branches from the tree. The thickest stems should be removed first. Pruning overgrown lilacs is simplest in the early spring before the branches start to leaf out, even if you’ll lose some blossoms for the current season. Your overgrown lilac should consist primarily of new shoots after three years of consistent pruning. After the plant starts to bloom all over, you may start doing routine maintenance pruning.
You can take the dramatic action of pruning back the entire plant to 6 to 8 inches above the ground in the early spring if you don’t like the way your old lilac looks or you just want a quicker solution. To encourage new development, fertilize the plant with compost or a balanced fertilizer. Throughout the growing season, new shoots will appear; allow them to continue to develop over the summer. The following spring, start cutting the spindly growth while keeping the healthiest shoots and keeping an eye on the plant’s shape. By pruning the remaining shoots to just above a bud, you can promote branching. After this, continue with routine maintenance pruning.