Tomato seedlings do not grow: what to do


Seedlings of tomato are considered among gardeners less whimsical than pepper or eggplant.

But sometimes this culture gives a lot of trouble. Gardeners complain that tomato seedlings are not growing. This trouble overtakes not only beginning vegetable growers, but also experienced gardeners are faced with a similar problem. You can solve any problem when you know the reasons for its occurrence. What factors lead to the fact that tomato seedlings grow weak, their leaves dry or turn yellow, and spots appear on the plant?

Among the main reasons should be highlighted:

  • violation of the diet;
  • insufficient lighting;
  • culture diseases;
  • the invasion of parasites;
  • illiterate picking saplings.

To help tomatoes in time, you need to carefully examine the seedlings. This is especially important if you are growing your own seedlings for the first time. Timely action - the key to your success with problems with small plants.

We find out the possible reason

To begin with, we will determine which factors lead to stunting or a poor appearance of tomato seedlings.

Tomato seedlings grow poorly if it:

Gets inadequate nutrition

This is an assumption, but certain signs indicate a lack of useful components. Carefully inspect the tomato seedlings.

When there is not enough nitrogen, the stems are thinned, the leaves are small and pale, the whole sapling is very weak. Well feed urea (4g to 10l).

Redness of the underside of the leaves of a tomato is observed with a lack of phosphorus. Feed superphosphate (12g per bucket).

The ends of the leaflets curl and turn yellow with potassium deficiency. Potassium sulfate will help. Marble color they acquire when they have little magnesium, and stop growing from a lack of iron. For the same reason, tomato bushes begin to turn yellow from chlorosis. Treatment for seedlings - we remove in the shade and apply iron-containing fertilizer and magnesium sulfate (25 g per bucket) over the sheet.

Illiterately spell

Carrying out this operation requires attention and quality from the gardener. If you slightly relax your guard, you can bend the roots of a tomato or damage or tear it off during transplantation, as well as allow air space between them. Any of these factors will lead to poor survival, stunting or death of the plant. To avoid this, carefully inspect the root system of tomato seedlings and carefully plant it in the ground, observing all requirements. If it was not possible to transfer the seedling with a lump of earth, carefully position the root system in the new hole and tamp the ground after transplanting.

Important! Maintain the required distance between tomato seedlings when picking.

Violations in the care of small tomatoes

To this point, in the first place, should include watering. Many growers believe that the soil should be wet all the time. However, because of this, seedlings are experiencing waterlogging. The ground in the pot should dry out a bit so that the disease does not develop due to stagnant moisture, and the roots have access to oxygen. Provide a seating box with good drainage.

The second factor of care, in violation of which does not grow tomato seedlings - temperature. As soon as the seedlings appeared, the boxes are placed in a cool room. Daytime indicators - 16 ° С-18 ° С, at night we withstand 14 ° С-15 ° С. After a couple of weeks, the indicators change - up to 20 ° C during the day and 16 ° C at night. A month later, there should be three leaflets on a seedling and it is prepared for picking.

The third is the lighting. Tomato saplings on short spring days must be dosvechivat. A light day is kept for at least 14 hours. However, if direct sunlight hits the seedlings, it can get a "sunburn." And then on the seedlings of tomato appear clear or white spots. It happens when cloudy weather keeps for a long time, and then a bright sun comes out. Shade plants and spray with Epinom.

Diseases and pests

These factors can not be ignored, so below we consider them in more detail.

Not suitable for tomato seedlings

This option should be allowed if all the parameters are maintained, the care is competent, there is no disease, and tomato seedlings are ill.

In this case, only the replacement of the substrate will help.

The list can not be considered the most complete. The reasons that are most often recorded by gardeners are given. Among the rest, there may be an illiterate choice of variety or non-application of recommendations of the lunar calendar.

What diseases and pests stop the growth of tomato seedlings

The defeat of diseases or the impact of parasites can not only slow down the development of seedlings, but also ruin entire colonies of seedlings.


Often among the seedlings there is a drop in a number of specimens. The reason is the "black leg" - an infectious disease not only of tomato seedlings, but also of other cultures. The stems below darken, they are formed by "overruns". Then the seedlings wither and fall, the roots begin to rot. Diseased plants will have to be removed. The rest must be transplanted at a greater distance than before. Soil is prepared new, in it add ashes (wood) and the calcined sand.

After transplanting, seedlings are sprayed with “Fundazole” and not watered until the soil is completely dry. Be sure to air the room. To deal with this disease is much more difficult than to prevent. It is important at the stage of soil preparation to add wood ash to the soil mixture, in the period of growth of seedlings to protect it from excessive moisture and high temperature. Inspect tomato seedlings daily. At the first signs of “black leg”, use biopreparations (“Fitosporin”, “Baktofit”), pollinate the soil and seedlings with ash. In the running form of the plant is better to remove.

Rot (root and basal)

Here the cause will be overflow of seedlings in combination with low temperature of the soil or ambient air. We have to act very quickly. It is necessary to transplant tomato seedlings in another soil. Before planting, the roots are washed in solutions of potassium permanganate or Fitosporin.

Septoriosis (white spot)

Disease specks with a darker border signal the disease. This is a type of fungal disease. It is transferred with the soil, and develops at elevated humidity and temperature. Diseased plants are removed, the treatment is very problematic and long. It will be more important not to forget to warm and disinfect the soil before sowing a tomato.

Spider mite

The main pests that at the time of growth of seedlings can harm it are spider mites, earwigs, woodlice. Even if you do not know what parasites look like dangerous for seedlings, having noticed any colonies, do the processing. The drugs Fitoverm, Aktellik and karbofos work well.


We considered the possible causes that lead to poor growth of seedlings. But, it is necessary in each case to carefully look for adverse factors. To understand why seedlings do not grow, it is possible with constant monitoring of seedlings. The best way to protect seedlings from problems:

  • study recommendations for growing tomatoes;
  • consider in advance the possibility of compliance with the temperature, lighting and humidity parameters;
  • take care of good ground;
  • choose stress resistant varieties;
  • find information on the rapid identification of diseases and pests of tomato seedlings;
  • get rid of doubt.

The last point is very important. Growing powerful, healthy tomato seedlings is much easier than is commonly thought.

This plant is easily adaptable, with good survival. Follow the recommendations, and your tomato seedlings will grow without problems.