Tomatoes are a classic greenhouse plant. Planting tomatoes in a greenhouse should be done only when the ground warms up enough, and the threat of night frosts has passed. If the seedlings are not overgrown, try to do not deepen because in this case, at first there will be an active formation of new roots, and the tops will not grow and develop.
Planting tomatoes in a greenhouse is done in almost the same way as in open ground. Prepare in advance holes or furrows, where you can pour humus, ash or complex mineral fertilizers. Do not fill them with fresh manure, chicken dung, urea, or nitrogen fertilizers. The roots of the plant will simply burn out from manure, and from the excess of nitrogen, instead of tomatoes, you will get beautiful tops. The holes need to be shed well, and then the seedlings should be spread over them, cut off all leaves that are below and at ground level, cover with earth and shed again properly.
Do not be too lazy to also cut off all diseased and yellow leaves, they are usually found at the bottom of the plant. They are the gateway for infections that spread very quickly in greenhouse conditions. Water the tomatoes sparingly before flowering. After a couple of days, the plants are tied up in an upright position. Do not let the air in the greenhouse heat up more than 30 degrees. At this temperature, tomato pollen becomes sterile and the fruit does not set. Regularly ventilate greenhouse.