Lilacs (Syringa) are bushes that, depending on the species, can reach heights of 15 feet and bear clusters of fragrant flowers. The flowers are attractive to butterflies and bloom in the middle to late spring. Lilacs thrive in soil that measures a pH of 6.0 to 7.0, which is regarded as neutral to slightly alkaline. This range is where the soil is least acidic and most alkaline. Only when the pH is below this range do they require lime.
How to Properly Plant Your New Lilac
1. When brand-new lilacs arrive, soak them in water for at least an hour before planting.
2. It is recommended to plant in full light for at least 6 hours.
3. Check the spot for drainage; lilacs detest wet feet.
4. Don’t plant your lilacs too deeply; instead, dig a big hole.
5. A raised bed might be ideal if your soil is heavy, moist clay.
6. Adding some compost or manure is an excellent idea because lilacs need rich, organic soil.
7. Your lilacs will benefit greatly from adding 1-2 scoops of Fox Hill Lilac Food.
8. Water your new lilac after planting it.
9. Mulch the area surrounding your new lilac with 3 to 4 inches of bark.
10. To ensure that all of your hard work pays off, follow all post-planting care instructions.
Post Planting Tips
Watering: In the absence of rain, newly planted lilacs need to be watered at least once a week. Once established, especially if you used 3–4 inches of bark mulch, your lilac will be able to withstand dry spells. Pull up some of the bark mulch and inspect your lilac by digging 2-3 inches into the soil with a garden trowel. Too much water is just as terrible as not enough “determine if the soil is wet or dry Still the best way to make sure your lilac is receiving enough water is a gentle trickle from a garden hose.
Fertilizing: A few weeks before the leaves emerge in the early spring is the best time to feed your lilac. We use an 8-20-16 Lilac Food at the nursery that is fortified with lime and seaweed. The ideal way to apply granular fertiliser is to spread it out by the lilac’s drip line under the bark mulch. By doing this, you can ensure that the lilac food is reaching the roots and not evaporating into the atmosphere as it decomposes. The lime is necessary to help raise the pH because lilacs prefer soil with a pH that is close to neutral; they don’t want sweet soil, but they do enjoy soil that is rich in organic matter. Lime can be be substituted with wood ash, but you’ll need twice as much of it. Lime and wood ash are solely used to assist keep the pH close to neutral; they are not fertilisers. Re-fertilize your lilac by the Fourth of July or soon after the flowering season finishes. In the fall, never fertilise your lilacs.
Pruning is the most crucial step to ensure high-quality flower output, therefore please don’t be afraid to do it. The optimum time to prune an overgrown lilac is during the winter months, but doing so sacrifices flower buds. If you can’t bear to do so, prune as soon as the blooming season is finished, and I mean immediately after. Older trunks can be reduced in size to 12 “If necessary, use a chain saw to restore an ancient lilac stand. A tried-and-true way for transforming an old lilac that looks like a tree back into a bush is to remove 1/3 of the older trunks each year. Dead heading, or the removal of spent blooms, is only done to make your lilac not look so unpleasant; contrary to popular belief, it has no impact on the amount of flowers that will blossom the following year.
The Top Three Lilac Questions
1. Excel (L6300)
Miss Kim 2. (L7000)
Third, Angel White (L2300)
California Rose 4. (L5100)
If you want to see if you can acquire lilac blossoms in the south, these four lilacs can help you with one of the following.
1. Expand and blossom
2. Develop but never blossom
3. Die
There are a variety of reasons why lilacs don’t blossom. The actions listed below can help you encourage flower buds for the coming season.
1. Ensure that your lilac receives at least six hours of sunlight daily.
2. Adhere to all planting guidelines
3. Prevent Bambi from eating your lilac during the cold months.
Facts About Lilac Color
1. Lilacs might appear darker and richer in colour during cool, moist conditions at flowering time.
2. Blooms can fade to lighter shades more quickly in hot, dry weather throughout the blooming season because the pigment is bleached off more quickly.
3. Darker colour tones, particularly those in dark purples, have been found to pop out more in heavy soils.
4. Lilacs have a reputation for looking more faded or washed out in lighter soils.
5. Any combination of the aforementioned elements might cause lilacs to change colour from year to year.
6. Young, immature lilacs have the ability to blossom in paler hues; they take 4-6 years to reveal their real colour. Lilacs can begin to bloom as early as a few inches in height, and the blooms are frequently larger than the plant itself. Age is not a factor in determining when a lilac will begin to bloom; this is determined by the weather, the plant’s growing environment, and some say a little lilac luck!
Which fertiliser is ideal for lilacs?
Lilac plants don’t require a lot of food or fertiliser. A 10-10-10 fertiliser mixture applied yearly in the early spring is what we advise. (The amounts of nitrogen, phosphorus, and potassium, or NPK as they are popularly known, are represented by the digits 10-10-10 in the formula.) Early spring fertilisation of lilacs with a high phosphorus solution encourages blossoming.
Coffee grounds and grass clippings are also excellent sources of nitrogen. Use in moderation since an excess of nitrogen in the soil can lead to subpar blooms. The ideal soil conditions for lilacs are slightly alkaline (6.5–7.0 pH), wet, and well-drained. The soil may become more alkaline by adding bone meal to it. Use Miracle-Gro Shake ‘n Feed Flowering Trees & Shrubs Plant Food in the spring if you decide to feed your plant. Last but not least, lilac plants dislike acidic soil. Epsom salts can be used to encourage blossoming while the plant is dormant.
How can I improve the bloom of my lilacs?
Although there are several potential solutions to this problem, pruning might hold the key. Lilacs blossom on the growth from the previous year, so it’s crucial to cut them as soon as the spring blooming is through. Pruning a lilac in the summer, fall, or winter may result in the removal of buds that would have bloomed the following spring.
After the spring bloom, try to only lightly prune the plant. If you want to avoid delaying the next bloom by drastically pruning your lilac shrub, simply remove the oldest and heaviest branches and trim the inner branches to make room for sunshine to enter the bush.
Take into account the age of your lilac bush, which by this point may have evolved into a tree. On younger wood, lilacs bloom at their best. If the majority of your lilac’s structure is old, decayed wood, blooms may be scarce. An elder lilac can require rejuvenation pruning, followed by a two- to three-year wait before it can bloom fully again.
Are lilac bushes sensitive to acid?
Lilacs prefer soil with a pH between 6.5 and 7.0, which ranges from slightly acidic to slightly alkaline. If the pH is either too high or too low, the bushes may suffer because the nutrients they require from the soil may not be easily available.
How are lilac Fullers made?
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 are lilacs kept in good health?
An old, overgrown lilac was one of the few plants that endured my garden restoration. The fact that it obscured my neighbor’s garage and, more importantly, sported steel-blue double flowers, led me to rescue it. Although the blossoms on this shrub were both lovely and fragrant, it was difficult to appreciate them because there were so few of them. I decided to go with a rejuvenation pruning because I knew there was no reason to give up on this long-neglected plant because lilacs can handle severe pruning.
On stems that are no older than five or six years, the common French lilacs (Syringa vulgaris cvs.) yield the most and the largest flowers. The flowers get fewer, smaller, and farther away as the stems get older. A lilac, however, may reliably produce blossoms for decades with the right trimming. The method you choose will depend on how old your shrub is. Plants are maintained annually to keep them healthy. A more drastic trimming may be necessary for lilacs like mine that have seen better days.
Lilacs should be clipped annually to encourage healthy stem development and strong growth that improves flowering. Cutting sick, deformed, and unproductive stems to the ground constitutes annual pruning. I thin and cut back some stems as well to promote healthy, evenly spaced growth. To prevent them from growing too far away from the centre of the plant, I also pruned a few of the new shoots that emerged from the roots. I left a few inches between each stem to prevent crowding. Since they produce the most, I maintain the pencil-thick shoots that extend all the way to the ends of the branches. Small, twitchy growth is unproductive and won’t blossom. This growth can indicate an excess of aged, unproductive stems or too much shadow. Remove stems as soon as possible after blossoming, or in late winter if you don’t mind losing a few blooms. Cut off stems and shoots at or just below the soil line.
Dwarf lilacs rarely need pruning
Both the “Palibin” Meyer lilac (Syringa meyeri “Palibin”) and the “Miss Kim” Manchurian lilac (Syringa pubescens ssp. patula “Miss Kim”) are twiggy-habiting, somewhat small lilacs. On these types, just deadheading is needed in terms of pruning. You can prune some of the older stems as the plants get older to make place for younger, more robust stems. In contrast to regular lilacs, these plants hardly ever spread out of control. They might never need to be entirely regenerated if you only undertake a tiny amount of trimming every few years.
After the blooms have faded, deadheading, another aspect of annual maintenance, should be carried out as soon as feasible. Just above the two new shoots that slant out from the stem that stopped with the old bloom, the base of the old flower cluster should be cut off. The new shoots will develop throughout the course of the summer, produce flower buds, and culminate in a cluster of flowers the following spring. While not as crucial as the annual thinning, eliminating the old blossoms enables the plant to focus more of its energy on developing robust branches and flower buds. In June, I deadhead and thin my plants as needed.
While performing this yearly maintenance, I occasionally come upon a young, robust shoot that may be getting too tall but is still a good, productive stem and is a candidate for tipping off. I cut the wasted flower’s entire top stem back to one or two side shoots at the desired height rather of just cutting it off at the base. The side shoots that are now near the top of the bush are encouraged to grow vigorously and develop flower buds for the following year by this cut, which also aids in shrinking the shrub.
My own old, overgrown lilacs need more severe pruning. I went outside in the early spring before growth got going to get a good look at the bush. I looked to see if the plant had been grafted before I began chopping. I immediately cut it down to the ground as it hadn’t (for a grafted plant, see the panel below). I recognised that this drastic trimming would result in the plant losing part of its aesthetic appeal for a few years because lilacs bloom on the growth from the previous season. However, I was also aware that the reward—more blossoms and a stronger plant—would be worthwhile.
It’s crucial to nourish the plant after rejuvenation pruning with compost, composted manure, or a balanced chemical fertiliser and to make sure the soil pH is close to neutral, which lilacs appreciate. In the upcoming years, these supplements and some high-quality mulch will help to encourage vigorous new growth and enhanced flowering.
Has your lilac been grafted?
If your lilac has been grafted, check it out before you start making cuts to the stems. Grafting is a method of plant multiplication in which the scion, or branch, of one species is joined to the rootstock, or stem, of another species. This is typically done to enhance a plant’s look or traits. A graft union, where the cultivar’s scion wood joins the rootstock several inches above ground level, should be obvious. An apparent change in the bark from the rootstock to the scion’s bark, as well as a little swelling at the graft union, are things to watch for. If your plant has been grafted, all of your cuttings must be made above the graft union, and you must prevent shoots from the rootstock from developing into new flowering stems. Flowers of the desired shape or colour will not be produced by shoots that emerge from the rootstock.