Growing tomatoes in a polycarbonate greenhouse: from variety selection to harvest

Growing tomatoes in a polycarbonate greenhouse: from variety selection to harvest

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Growing tomatoes, like other vegetables and fruits, always requires effort, time and certain skills. Growing vegetables and fruits in greenhouse conditions will not be an exception. To get a good harvest, you need to pay special attention to some stages, which will be discussed below.


  • Choosing a variety for a greenhouse
  • Sowing seeds for seedlings
  • Preparing the greenhouse for planting seedlings
  • Transplanting
  • Basic care activities

Choosing a variety for a greenhouse

Growing tomatoes in a greenhouse has its own characteristics. Therefore, when choosing seeds, the first thing to pay attention to is the growing conditions. For the greenhouse, only those varieties are suitable that are intended for cultivation in greenhouses.

Next, you need to clearly understand the purpose of the future harvest. If you plan to only use it fresh, then salad varieties are suitable for you. If preservation is the goal, then preference should be given to canned varieties. Well, if the use is multifaceted, then it is worthwhile to safely purchase varieties of universal use.

Also, varieties intended for cultivation in a greenhouse must meet the following characteristics:

  1. Be indeterminate, that is, tall. They have unlimited growth and are therefore able to bear fruit until late autumn.
  2. Be resistant to major diseases, as the humid environment of the greenhouse promotes the accelerated spread of various pathogenic microorganisms.
  3. Have high yields. It is not necessary to occupy a scarce space in the greenhouse with varieties with low yields.

Sowing seeds for seedlings

In order for the seeds of the selected variety to give friendly and healthy shoots, they must be prepared in advance. To do this, you can carry out their elementary disinfection in a solution of pink potassium permanganate. Also, various growth stimulants can be used to improve germination energy. For example, "Epin" or "Zircon" shows good results.

Attention! Some producers pack already processed seeds. You can distinguish them by the painted surface. Such seeds do not need additional processing.
The soil for sowing can be prepared independently from equal parts of sod land, humus and sand, or you can purchase ready-made soil for growing seedlings. When sowing, the seeds are covered by 0.5 cm, after which the sowing containers are watered and placed in a warm place. Under favorable conditions, the first shoots may appear as early as 3 or 4 days.

Further care of the seedlings consists in regular watering. When 3 or 4 true leaves appear, they begin to pick the seedlings into separate containers. When diving, be sure to shorten the central root on the seedlings. This technique promotes the development of the root system.

Preparing the greenhouse for planting seedlings

They begin to prepare the greenhouse for planting seedlings in early March. At this time, she already warms up enough in the sun. And the soil in it begins to thaw gradually. Preparatory work should start with disinfection. To do this, use sulfur checkers, which are used to fumigate the greenhouse.

Attention! When using sulfur sticks, you must act as carefully as possible. Since they are highly toxic to humans and other warm-blooded animals. After disinfection, you can start preparing the soil. To do this, perform the following activities:

  • Digging up the soil
  • Fertilize
  • Break up the beds

After the greenhouse is prepared, you can start planting seedlings.


When planting tomato seedlings in a greenhouse, the following simple rules must be observed. At the time of planting seedlings, the soil must necessarily warm up well. If we neglect this and plant tomatoes in cold soil, then the root system will simply stop developing and the plants will stop growing for a long time, and some of them may die.

Planting is best done in the evening or on a cloudy day. So plants recover faster and adapt to new conditions for them.

When planting, you do not need to apply too much organic fertilizer in the form of humus or compost. Only one handful is enough for each hole. Also, when planting, plants need to be positioned, focusing on their height. You should not alternate tall growth with medium and short ones.

Basic care activities

Timely care is the key to a high yield. You should start caring for the plants immediately after planting the seedlings.

Watering mode

Do not water the tomatoes for the first few days after planting. At this time, their root system is especially sensitive to excess moisture. And for growth and development, the water that was used for irrigation during planting is quite enough for them. Before flowering, tomatoes are watered 1-2 times a week, while about half a bucket of water is consumed per 1 square meter of area.

After the bushes bloom, watering should be increased to 1.5 buckets of water per square meter. Advice! It is not recommended to use cold irrigation water. It is best if its temperature is 20-25 °. It is also best to water tomato bushes in the morning and evening hours. This will help prevent sunburn when water hits the leaves.

Airing and garter

The greenhouse is an artificially created environment, therefore it must be ventilated. Ventilation also helps maintain an optimal humidity-temperature ratio. Tomatoes practically do not react to drafts, so you can ventilate in any convenient and affordable way. For example, you can open two vents in different parts of the greenhouse, or use the door and vents.

Tomatoes growing in a greenhouse must be tied up. You should start within a week after disembarkation. To do this, in the greenhouse, they equip trellises of a linear or frame structure. With the help of a garter, tall tomato bushes are supported in the desired position. As a result, light and humidity are maintained at the desired level, and also easier to harvest.

Stepping and feeding

Tomatoes growing in the greenhouse should be pinned. This avoids unnecessary thickening of the plantings. Most often, depending on the variety, the plants growing in the greenhouse are formed into one or 2 stems. The first pinching should be carried out at the time of planting seedlings. Then it is carried out as needed.

The first time tomatoes are fed 2 weeks after planting. To do this, you can use a mixture of mullein infusion and nitroammophoska. For its preparation, half a liter of pre-fermented mullein and 1 tablespoon of nitroammophoska are added to a bucket of water. For each plant, about 1 liter of this mixture is consumed.

Attention! Watering with fertilizer should only be at the root and strictly on damp ground.
After 15 days, the next feeding is carried out. For this, 1 teaspoon of any potash fertilizer and any humic fertilizer are used according to the attached instructions. They are bred in a bucket of water. For each bush, about 1 liter of this mixture is also consumed. In total, from 3 to 4 dressings are carried out per season.


Most often, there are no pollinating insects in the greenhouse. Therefore, to obtain a high yield, plants need to be pollinated. This is very easy to do. Choose a sunny day and gently shake each flower brush. You can also tap on the trellis to shake the tomato bushes.

After that, the plants themselves are immediately watered, and the brushes are sprayed with water. After 2 hours, the greenhouse is ventilated. It is very important to ensure that condensation does not collect on the polycarbonate walls while the fruit is being poured. The increased humidity at this point will greatly affect the taste of the fruit.

With an excess of moisture, the tomato loses its sugar content and friability and acquires a watery and sour taste. If you strictly adhere to all of the above recommendations, then you can grow a bountiful harvest of tasty and aromatic tomatoes with your own hands.

Video about growing tomatoes in and outside the greenhouse: