Why do not bloom tomatoes in the greenhouse

Tomatoes are far from the most capricious crop grown in greenhouses, but even optimally selected fertilizers, temperature conditions and humidity do not always serve as a guarantee of proper development and productivity. Sometimes the plant stops giving buds for no apparent reason. Consider why tomatoes do not bloom in the greenhouse, and already formed buds fall off.

Tomatoes do not bloom in the greenhouse

Causes of the phenomenon

To determine the cause of the lack of flowering and understand what to Do, you need to consider a number of prerequisites. In most cases, unfavorable growing conditions become the cause.

The main reasons for the lack of budding:

  • Low air temperature (optimal temperature - 20-25 °) or soil. With a lack of heat, seedlings not only cease to form buds, but also die.
  • Excess heat in the air (over 30 ° C).
  • Excess or lack of moisture in the soil or air.
  • Lack of pollination. In greenhouses, tomatoes need to be pollinated artificially.

It is possible to determine whether a plant is comfortable in these conditions by its appearance. If the bush has too massive stems and leaves in the absence of flowers, it suffers a heat deficit. The lack of moisture can be easily determined by noticing cracked soil at the roots, twisted yellowed leaves and dry tops.

In addition to the main factors that can stop the budding of tomatoes, there are additional ones:

  • lack of lighting and air circulation due to thickening of the cuttings;
  • potassium or phosphorus deficiency with a lack of fertilizers;
  • a supersaturation with nitrogen during an overabundance of organic fertilizers (manure, compost);
  • various diseases;
  • processing of seedlings with pesticides.

Sometimes a plant simply does not have the strength to form buds. Multiple and large-fruited tomatoes are subject to this. In such varieties, it is recommended to control the number of ovaries. It is better to choose tomatoes with medium fruits. They are less susceptible to falling ovaries.

Mistakes in leaving

It happens that the absence of flowering or the fall of the formed buds on tomatoes is due not only to external factors. Due to the lack of experience or the necessary information, gardeners themselves can do things that negatively affect the budding of the culture.

Most often, the following errors are made:

  • the cultivation of certain varieties from their own planting material (seeds): such tomatoes will not bear fruit;
  • treatment with pesticides of bushes that are already blooming:
  • erroneously selected location of the greenhouse regarding access to sunlight (lack of heat);
  • overly dense planting of plants, in which they interfere with each other to grow and develop normally.

Tatyana Orlova (candidate of agricultural sciences):

For growing in greenhouses, mainly plants with high growth and yield strength are used. These are, as a rule, first-generation hybrids designated on the package as F1. It’s not worth leaving fruits from these plants for seeds, because during hybridization, plants with different biological properties could be used. In the second generation, these seeds can give a negative result, you can get a powerful plant, but with small fruits of low quality and almost not blooming.

If you correctly and in a timely manner establish the reason why new flowers are not formed on the tomato, and the already formed ones fall off, you can choose effective measures to restore the budding of tomatoes.

Prevention methods

Tomatoes need to create good conditions

After establishing the cause of plant growth retardation, you must immediately eliminate it. The sooner favorable conditions for the seedling are restored, the greater are the chances for the normal growth and development of the plant.

To restore comfortable conditions, you must:

  • Set a suitable temperature in the greenhouse (heaters should be used during frosts).
  • Pour paths between seedlings with cool water to increase air humidity and lower temperature. This should be done before noon to avoid condensation.
  • Pour the plants with warm water to raise the temperature by a couple of degrees (only if the outdoor temperature is not more than 15 ° C).
  • Ventilate the greenhouses from time to time for fresh air.
  • Carry out artificial pollination or lure bees by placing melliferous flowers in the greenhouse.
  • Get rid of all the empty flowers so that the seedling will direct its forces to the formation of new buds.

When watering a plant, it is always necessary to pay attention to the temperature of the water. If it is too low, the roots of the plant will experience stress, and the budding process will stop.

Tomato is a culture sensitive to fungal diseases, therefore, before planting, it is imperative to decontaminate the seeds (with a solution of manganese) and soil (with steam, heating or a solution of manganese). If the bush is infected with a fungus or insects, the fight against them must be started immediately.

Tatyana Orlova (candidate of agricultural sciences):

One of the simple ways to disinfect the soil in a greenhouse - thermal - is spilling boiling water. Immediately after this, the soil in the greenhouse is covered with tarpaulin so that it does not cool down quickly. This makes it possible in the spring not only to disinfect the topsoil, but also to warm it up, so that planting work can begin earlier.


Regular preventative measures should be taken to prevent problems with budding. Their timeliness can greatly reduce the risk of seedling damage.

First of all, in order to prevent the loss of flowers from tomatoes, the crop needs to be provided on time.

There are several rules that should be followed:

  • Do not create an excess of nitrogen fertilizers in the soil when the tomatoes bloom.
  • Before flowering, fertilize the soil with double superphosphate and potassium sulfate.
  • Keep track of air humidity: 60% is ideal in a greenhouse.
  • To adhere to insignificant temperature fluctuations within 20-25 ° С.
  • Twice a week, abundantly water flowering bushes under the root
  • Periodically loosen the ground for better air circulation.

The most important principles of prevention are methodology and timeliness of implementation, as well as compliance with all recommendations.

Selection of planting material

To minimize the risk of plant damage, you need to know the rules for preparing planting material, caring for the plant and creating optimal conditions for crop growth.

When buying seeds for greenhouse cultivation, you need to pay attention to their quality, as well as the expiration dates indicated on the package. Old planting material can cause poor budding and falling of flowers.


From seedlings of tomatoes in the greenhouse, color falls for various reasons, ranging from external negative factors to the mistakes of gardeners. However, all these problems can be corrected if the cause is identified in a timely manner and resolved.

To minimize the risk, it is recommended to plant tomatoes of several varieties that differ in resistance to high or low temperatures. In this case, even in the absence of ovaries on one of the species, one can count on obtaining a crop of another variety.


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