Garden flowers, plants and shrubs

Why lilac does not bloom: the main reasons


Blooming lilac is so beautiful, romantic, mysterious. If there were lilac inflorescences, then summer is just around the corner. But what to do if this May lilac did not please you with its magical scent? Even experienced gardeners sometimes do not know what to answer the question: "Why did not lilac bloom?". And the reasons for the lack of flowering are different, because the intensity of the formation of buds depends on many factors.

The reasons for the lack of flowering in lilac

We highlight the main factors of the absence of budding:

  • Illumination. Lilac - frost-resistant, but light-loving plant. Therefore, the best option for planting young seedlings - east or west side. The south side is unfavorable for the formation of buds. Many people ask: "Why does not lilac bloom?", - and the bush grows under the crown of a wide tree. Such a neighborhood is strictly prohibited. Lilac should grow alone in a well-lit place, the shadow is not suitable. It is also necessary to take into account the swamped area and the level of groundwater flow. If the place you have chosen is often filled with water or the ground water is close, then such a place will not work. for growing lilac, because it does not tolerate waterlogging.
  • Improper planting of a young tree. Having bought the variety of ornamental plants you like, beginners often make mistakes when they are planted in the soil, and then they wonder why they did not bloom lilacs. So, for the future of good growth and flowering it is necessary to dig a hole about 40 cm deep. Pour drainage of broken brick and rubble, then a layer of compost or humus. Above, pour the fertile black soil. The root needs to be buried in the soil to the root collar. If you deeply deepen the roots, they can begin to rot, diseases will appear and the tree may die.
  • Diseases of ornamental shrubs. “Why didn't the lilacs bloom?”, Inexperienced gardeners ask, not noticing the appearance of the tree. It happens that the leaves are affected by diseases typical of lilac, which make them turn yellow or curl. And even if the lilac blossoms, then its inflorescences are some shriveled, underdeveloped. This is a painful condition. Often, to combat aphids or fungal disease of the leaves, they use the method of cutting the diseased branches, burning them together with the leaves. Then the plant rejuvenates and the disease recedes.
  • Nitrogen fertilizer. The excess fertilizer, especially nitrogen, leads to intensive development of green mass, the formation of new shoots. Therefore, those who frequently and regularly fertilize the soil around the shrub are wondering: "Why hasn’t the lilac flowered this spring?" To stimulate the formation of buds, it is necessary to eliminate nitrogen fertilizers. You also need to know when to fertilize the plant correctly. If you have planted a young tree in the earth rich in black soil and humus, then the following fertilizer is permissible only after 2-3 years.
  • Lack of regular pruning. Often, lilac lovers make mistakes without cutting off the inflorescences that have faded. If you do not, do not develop new flower shoots that will delight next year.

If you have read all the information until the end, you will probably not make more mistakes in the cultivation of ornamental shrubs, and blooming lilacs (photo above right) will delight you with its colorful inflorescences every year.

When the lilac blooms

Immediately it should be noted that the question of exactly what year the tree blooms will directly depend on what time the tree was planted and in what way. Besides, novice gardeners should knowthat lilac will never bloom in spring the next year immediately after planting.

Moreover, expect the first flowering next year also should not be the case if the tree was planted in the spring - this is an unfortunate time for planting shrubs. The best period for landing is the end of summer - the beginning of autumn.

The period of the first flowering of lilac falls, as a rule, in the third year after its landing. As for the abundant flowering, then this period can be expected even longer - most often it happens only in the fifth year after planting.

In this way, to wait for the moment when the tree starts to start up inflorescences in full, you will have to be patient.

Why lilac does not bloom for a long time: the main reasons

Numerous factors can lead to the absence of the long-awaited blooming of fragrant lilac. If you take them into account and take note of planting a tree can avoid many problems.

  • When there are no inflorescences on the tree in the first year after planting, this may be an indication that the tree was planted in the shade. The fact is that the lack of lighting, especially in the spring-summer season, adversely affects the period of its flowering. Lilac is considered a light-loving plant, constantly requiring a lot of heat and light. Therefore, if the shrub is planted near other trees or in the immediate vicinity of the house, preventing the penetration of light, the lilac may never bloom.
  • The wrong technology of planting seedlings can lead to the fact that the shrub does not bloom even in the fifth year. Inexperienced gardeners can make the following mistakes in the process of planting: excessive deepening of the roots of the shrub and the lack of drainage during planting.
  • Like most trees and shrubs, lilac needs systematic pruning and processing. If you forget to do it, then the young branches will not be able to fully develop the next year, which, in turn, will lead to the fact that the inflorescences are not fully formed.
  • Too compassionate gardeners mistakenly believe that the more nitrogen fertilizers a shrub receives, the better it will be for him, and that this will lead to abundant flowering next year. An excess of nitrogen in the soil is one of the frequent reasons why the shrub does not bloom.
  • Although lilac is an unpretentious plant, it still requires the correct choice of soil for planting. A common reason why lilac refuses to float is the inappropriate soil composition. The marshy soil is particularly unfavorable and the place where the groundwater is located relatively close to the surface. It should be remembered that lilac does not like overmoistened soil, as well as dense soil, because the roots of a plant in such conditions can quickly suffocate or rot.
  • No less frequent reasons causing the absence of the long-awaited flowering shrubs are various lilac diseases. Lilac will not be able to bloom, even if all the rules of planting were observed. The infestation of a shrub with pests or diseases can lead to the fact that the shrub does not bloom next year or ten years from now. Therefore, when detecting the slightest deviations, you should immediately take the appropriate measures: carry out processing with special means or cutting off infected branches. In general, the disease is best prevented and preventive measures are taken immediately after the shrub has been planted.
  • Another reason lilacs may not bloom is planting too close to other plants and trees. The fact is that the root system of most trees is so developed that it impedes the further development of the shrub.

If there is at least one of the above factors, then the lilac, most likely after planting will not be able to bloom. And if this happens, it may take more than one year..

Lilac bloom: rules for planting and caring for shrubs

In order for the lilac to be able to quickly please its flowering, you must adhere to the basic rules of planting and caring for shrubs.

  • Landing requires a competent approach when choosing a place to disembark. Therefore, you should choose a flat surface with good lighting. In this case, there should be no strong winds or drafts, there should not be near groundwater, the presence of sunlight in the first half of the day (at least for six hours a day) and the absence of other trees nearby.
  • To plant a plant should be as follows. The lilac hole is made twice as large as the root system of the shrub. Depth, depending on the size of the shoot, should be about forty to fifty centimeters. Before planting a shrub, rubble or sawdust should be poured at the bottom of the hole. After that, several manure or compost blades are added to the pit, and then a whole bucket of warm water is poured there. Only after these manipulations, the roots of the plant are lowered into the hole, filled with soil and slightly compacted.
  • Despite the fact that lilac is considered to be resistant to drought conditions, in order for the bush to bloom steadily and abundantly, it is necessary to follow the watering regime. In this case, watering should be systematic and affect not only the roots of the plant, but also the leaves, especially if the summer was too hot.
  • Landing is best in the evening or in bad weather, but not in sunny.
  • You need to land in the ground, which is pre-fertilized with organic dressings. After planting, do not forget to fertilize the soil with mineral dressing too. In the case when fertilizer was immediately added to the planting hole, the first top dressing after planting the shrub is required only after two or three years. Moreover, the means containing nitrogen in the basis should be fertilized in early spring, after which the fertilizer should be duplicated after four weeks and so twice a season. As for such dressings as manure or humus, they are recommended to be added only for the winter. If the soil of lilac planting contains a lot of acid in its composition, then it is best to spice it with ashes or with ordinary lime.
  • Be sure to around lilacs should remove all the large weeds, because weed takes a lot of liquid and nutrients from the soil.
  • Loosening the hole where the shrub is planted provides improved air penetration into the soil.
  • Systematic pruning of the shrub helps to give it not only an attractive appearance, but also to ensure full bloom from year to year. Therefore, in order for lilac to bloom well, it is necessary in the first two years after planting to prune the shoots for sanitary purposes, and for the following years with preventive ones. In this case, not only unnecessary branches are cut, but also pristvolnye shoots, after which the cut points are treated with garden and oil paint. To cut, so as not to harm the lilac, it is necessary after it has faded, namely in the summer.
  • To preserve moisture in the soil it is necessary to systematically mulch the soil.
  • If there are traces of insect or disease on the tree, you should collect all the infected leaves, cut off the bad branches and shoots, and then burn them to prevent the spread of the disease further. After that, the shrub needs to be treated with special preparations, depending on what kind of infection or pest struck the lilac. This may be Bordeaux mixture, preparations containing copper, potash funds, copper or iron vitriol, etc.


If you follow simple rules regarding planting and caring for shrubs, the lilac from year to year will delight the gardener with its rapid flowering and unique aroma. In addition, lilac - This kind of ornamental plants, which requires a lot of patience from the gardener, because abundant flowering is possible only for 4-5 years after the root system has fully developed.

Selection of seedlings

It is necessary to choose planting material with special care, since it will depend on him how many years your lilac will bloom.

To date, there are many ways to breed this lush shrub, but the most common way is microclonal reproduction. This method involves the separation from the parent bush top. Further, professional gardeners rooted the top and spread in the markets.

The microclonal method of reproduction is rather complicated, but at the same time, entrepreneurs love it very much, since with this type of reproduction it is possible to obtain a large number of copies in a minimum time. But there is a problem for the consumer. People who buy microclonal saplings often ask questions about why lilac does not bloom if it is already 3 years old or more.

The fact is that such shoots may bloom for the first time only in the fifth or sixth year of life, therefore it is better not to buy them.

Sometimes the reason that the lilac does not bloom can be the wrong planting technology. That is why experienced gardeners devote a lot of time to planting and prepare for it in advance.

Need to choose the right landing site.: well lit by sunlight, protected from drafts and groundwater.

The landing pit needs to be properly processed: its depth should be 40-50 cm, drainage should be done at the bottom (a layer of fine crushed stone with a thickness of 7-10 cm). In addition, take care of fertilizers, which should be the optimal amount - 30 g of superphosphate, 20 kg of humus and 300 g of wood ash. Especially careful to be with nitrogenous fertilizers (we will tell about it a little below).

One of the main reasons why lilac stops blooming is the wrong type of soil. It should be noted that this shrub will not be able to normally grow and bloom every year if it is planted on heavy clay soil.

Lilac loves the dry type of soil with moderate acidity (6.5-7.5 pH) and mediocre humidity. It should not be planted in this plant in highly marshy, heavy or waterlogged soil types. The groundwater level at the landing site should be no higher than 1.6 m. The place where lilac grows should not be submerged during periods of melting snow and high rainfall.

The soil for planting should be dry, with an optimal amount of macro and micronutrients. It will be good if, before planting, you pass the ground from the landing site to the laboratory.

Professionals should establish the level of all necessary minerals in the soil. According to the result of the examination, you will be able to draw conclusions about which elements are in surplus and which are in short supply. And if there is no suitable type of soil in your area, then it is better to remove the soil layer (square meter to a depth of 50 cm) and fill in a land suitable for lilac with all the necessary minerals.

In such conditions, with proper care and with regular dressings, the shrub will bloom for many years.

Insufficient lighting

If this lush shrub will not receive enough sunlight in the spring-summer period, then it may not flowering.

Lilac should receive a large amount of solar energy at the moment when it begins to bloom. Therefore, the best place on the site for landing lilacs will be the western or eastern side. It should be noted that in the south of the shrub is better not to plant, as the scorching rays of the sun can cause the young shoots of lilac to dry.

Also try not to plant a shrub in a dense garden or between densely standing buildings that create regular shade.

Feed errors

If you follow the wrong technology feeding lilac bush, the flowering process can not wait. A lush crown, large shrub size, enlarged leaves and many young shoots are the first signs that there is an excess of trace elements in the soil. Nitrogen provokes the accelerated growth of plant tissues, while the lilac will increase in growth and spend all the useful substances for the development of new shoots and leaves, and the flowering process will be absent.

In such cases, you need to stop feeding the soil with nitrogenous fertilizers. Bring urea and ammonium nitrate only once every 2-3 years.

For a normal flowering process, the lilac bush should be regularly cut and rejuvenated. If this is not done, then, as in the case of nitrogenous fertilizers, the shrub will acquire large sizes, and it simply will not have enough minerals for the flowering process. In addition, an incorrectly pruned (or not pruned at all) lilac bush looks feral and ugly, there is no harmony and pomp in it.

For the formation of a bush in the shape of a ball, all shoots should be cut at a height of 12-15 cm from the first bud. After 3-4 years you need to remove all the shoots and leave 10-12 lignified branches, which in a short period of time will give a large number of new shoots - bright and lush blooming.

In order to form a lilac shrub in the form of a tree (also called this type of bouquet), it is necessary to remove all the shoots from large branches, leaving only one, the largest shoot. About 5-6 rows of buds are left on this shoot, and the rest is removed. In addition, do not forget to regularly dig out of the ground and remove the root shoots.

После их удаления почву вокруг куста перекапывают на глубину 7-10 см. Процесс обрезки сиреневого куста несет важнейшее значение, так как ухоженный и обрезанный куст будет ежегодно радовать вас своим пышным цветением.

Diseases and pests

Пораженная различными заболеваниями сирень цвести не будет, и это факт. Indeed, in the process of defeating a bush by pests, the normal metabolism is disturbed, therefore the leaves start to dry and curl. In addition, you can see the dried and twisted inflorescences, which are the first sign of damage to the lilac bush. Usually lilac blooms for 2-3 years after planting, but only if the gardener properly cares for her. However, no matter what disease the shrub is affected, this can be immediately noticed.

The most common lilac diseases are:

  1. Panicles (refers to microplasma diseases).
  2. Fungal infections: powdery mildew (white spots on the leaves), phyllostiktosis (brown spots appear on the bush), bacterial rot (affects young shoots, as a result of which they begin to rot), heterosporia (holes appear on the leaves), etc.
  3. Viral diseases: ring spot or mottled, chlorotic leaf spot.
If you saw on your lilac bush any of the signs of the above diseases, then know that the shrub most likely does not bloom because of pathogenic microorganisms. But besides them, lilac bush can be attacked by larger insects:

  • Rosanic cicadas,
  • acacia spatula,
  • leaf weevil,
  • lilac tick,
  • mole mottled.
At the first detection of the affected parts of the shrub it is necessary to immediately remove and burn them. Also, as a preventive purpose, you need to handle lilac bush with special chemicals. To protect the shrub from viral lesions will help such means: "Spark", "Aktara", "Fufanon", etc. Spraying the bush for the purpose of prevention is carried out before the start of flowering.

Lilac must be processed twice, relying on the instructions for use of the drug. The second treatment should be 5-7 days after the first.

Chlorium oxide copper can be treated immediately after flowering bush (carefully spray each of the leaves and shoots).

The reasons for the lack of buds and flowers

There are several reasons why lilacs may not bloom. These include improper seed planting, low light, excessive water, poor soil, and a large number of diseases. A common mistake of those who plant a seedling for the first time is improper watering or fertilizer. Some do not know how to properly trim the branches, take care of the shoots. If the lilac does not bloom in spring, weather conditions and climate may be guilty, and too close ground water may be the cause. In such conditions, lilac does not want to bloom. If you correct all the mistakes in the care of a plant, even the most unaware gardener will be able to achieve significant results and will be happy with his work.

In order for a beautiful bush to please its owners and those around it, you need to find out the reason and apply certain measures for the growth and flowering of lilac for many years.

Lack of light

Lilac is a plant that loves the sun. The reason why the lilac has not blossomed may be its not the right place, where it grows in the garden, planting lilac in a too dark part of the plot, near other trees or close to the house. The plant will not be able to grow and bloom better in the shade, the most suitable location of the bush is on the western and eastern side.

However, to plant a lilac bush in the southern part of the garden is also “not correct” - the lilac will not bloom, and the bush may dry out and the buds simply fall off. And just do not plant lilac next to the conifers at a distance of less than 10 meters. Therefore, choosing the right place for planting a lilac bush - prevention of the lack of flowers in the plant.

Incorrect seed planting

Mistakes due to which the lilac does not bloom, gardeners make during planting, lead to a weakening of the bush and its root system. Damage to the roots of the plant is due to the fact that gardeners do not pour drainage or humus into the pit, bury the roots of the bush severely, or plant the plant too deep into the ground. Deeply buried roots can rot and cause tree diseases. Sick root system leads to the fact that lilac does not bloom. You should also carefully consider the choice of seedlings for planting. And the planting itself should be carried out in August or in early September, before the start of frost.

Soil selection

Choosing the wrong soil for planting is another reason why lilac does not bloom. The biggest mistake is the wrong soil composition. Particularly dangerous is marshy soil and a place where groundwater is close to the surface. Due to overmoistening of the soil and overly dense soil, there may be damage to the roots of the plant, and the lilac may not bloom. They may expire air, which will lead to death. And also near the lilac should remove all the large weeds that take away a lot of fluid and beneficial enzymes from the soil.

Pests and diseases

"Lilac does not want to bloom," say many gardeners, not fully knowing what the problem is. And just take a look at the leaves of the plant. After all, they can become a victim of various diseases, because of which the lilac will not bloom. The leaves may turn yellow, the inflorescences shrivel, the stability of all types of lilac decreases, and the lilac does not want to bloom. This is a clear sign that the plant is affected by the disease. In addition to diseases, lilac bushes are subject to insect infestation.

Infected bushes should be burned or pruned.

Nitrogen fertilizer

If the lilac bush has a well-developed crown, it gives new shoots, but does not bloom, then this is the reason for the soil oversupply with nitrogen fertilizers.

Lure will not benefit, if you do not know how much you can add to the soil, but only aggravate the state of lilac, and it will not bloom. Proper use of nitrogen fertilizers stimulates the lilac intensive development of a mass of green.

Usually, lilac is fed with nitrogen only 2 years after planting: 60-80 g of ammonium nitrate or 50-60 g of urea under a shrub are added every spring.

In the case of soil oversaturation with nitrogen, fertilizing is carried out 1 time in 2 years, that is, less often. Without the right feeding lilac will not bloom.


Lilac lovers very often find it unnecessary to trim the inflorescences that have already faded. If you start a bush and do not cut off the dried branches, the lilac will not bloom, as the plant simply acquires an unattractive appearance, that is, runs wild. And the beginning of the seed formation process will weaken the lilac. With the help of pruning can not only form a beautiful crown of the bush, but also to improve and ennoble this beautiful plant.


One of the important reasons that lilac does not bloom is weather conditions. Often the climate for lilac may be too harsh, and it simply will not be able to bloom in the spring. It can be hot summer or autumn, then lilac blooms, even if only a little, but in the spring it lacks strength, which is why lilac can not bloom.

In order for the lilac bush to delight its owners and others, as well as decorate the site, you should take care of the plant and treat it in a timely manner. After reading this article, you can find out the reasons why the lilac does not bloom and how to care for the blossoming lilac and the bush will please with its fragrance.

Unsuitable soil

It should be remembered that each lilac variety grows only in a certain soil, since breeders grow unique varieties in greenhouse conditions, giving them a different top dressing. And then it turns out that they cannot grow in ordinary land and bloom, unlike ordinary varieties, which do not care what the composition of the earth is.

If two years after planting a purchased lilac seedling, flowers do not appear, then you need to study the composition of the earth and make the missing fertilizers.

Then the likelihood that the lilac blooms will increase.

If the land is wetted, marshy, then the lilac in it will be difficult to grow, as it is not a moisture-loving shrub.

And heavy clay soil will not suit her, as the roots will not be able to get enough oxygen. The same can be said about sour soil.

For perfect shrub development, the soil should have neutral acidity and moderate humidity. If the lilac is planted in too windy area, then it is likely that it will not bloom, as it will feel very uncomfortable in this place.

Irregular pruning

Like many shrubs, lilac need to be cut every year. Otherwise, it will look ugly and gradually stop blooming.

Usually lilacs are made in the shape of a ball. Pruning is desirable to do in early spring, even before the first buds or in the middle of summer. But this procedure is undesirable during flowering or autumn. The first cut dry twigs.

If a lot of young shoots have grown around the lilac, then they definitely need to be removed with shears, cutting off almost to the root. Otherwise, they will take all the nutrients from the mother bush. After that, you need to shallow the soil around the bush, removing the root system of the shoots.

When pruning a bush, it is advisable to leave powerful shoots by trimming smaller ones, since new shoots will later grow from powerful ones.

If the bush is not cut, then every year the flowers will be smaller and smaller in size and quantity. Immediately after flowering, you need to prune all the buds that have dried. Otherwise, seeds will appear in the place of flowers, which will take away all useful substances from the tree.

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Lilacs can be propagated in three ways: seeds grown in the place of flowers, cuttings, shoots that grow at the roots of the main bush. But you can multiply with vaccines. This difficult way is more suitable for experienced gardeners.

For propagation by cuttings choose a tall shoot, which has already bloomed. It is cut from a one-year escape in early August.

The cut should be oblique, so that the cutting is easier to absorb minerals. Then remove all the leaves and put in a liquid in any solution to stimulate growth. After the roots have grown, transplant the stalk into a hole, previously filled with drainage and humus.

If there are a lot of shoots around lilacs, then you can dig any of them for reproduction. But this should be done carefully, so as not to damage the root system.

Transplantation is recommended before the beginning of September, so that the seedling has time to adapt before the onset of winter.