How to Grow Tomatoes in Pots in a Greenhouse?

Who has a vegetable garden without any tomato plant? It can be said that this vegetable is everyone’s favorite and that its culture is very easy. With the right conditions, you can get up to two annual harvests of these plants. So they provide a great production of their valued fruits.

It does not have to be large greenhouses of farms; a smaller one in your garden can also provide excellent results. And one of the easiest and most productive if it is grown in a pot or container.

Related: How to Build a Small Greenhouse for Vegetables

Without further ado, let’s get right to the heart of the matter of how to grow tomatoes in pots in a greenhouse! Let’s start with the choice of pots.

Preparing the Pots: Size, Types, and Soil

It doesn’t matter if the pots are terracotta or plastic; it’s the size that matters. For better production, larger pots or containers will be more appropriate. If the pots are less than 30 cm in diameter, tomato plants will be too cramped.

When filling a pot, always start with the poorest medium and end with the richest medium. In fact, with watering, the nutrients will gradually descend to the bottom of the pots. And this advice is valid for all crops in pots, including flowers.

Compost is really the key to success for good production of tomatoes in pots. In a pot, the volume of soil is necessarily limited, and the tomato is a fruit that needs rich soil.

At this stage, above all, do not water the pots; this would only make them heavier. And we still have to transport them to the greenhouse!

Variety of Tomato: Which One Is the Best to Grow In Pot in Greenhouse?

First of all, we must differentiate between two large groups of tomatoes when planting. “Determinate” tomatoes are a more compact and branched plant that does not require pruning. They have limited growth. It is ideal for growing tomatoes in a pot at the greenhouse.

On the other hand, “indeterminate” tomatoes are those whose growth is unlimited. They require a larger space and will be bearing fruit throughout the season. These types of tomatoes are the ones used in gardens.

When it comes to growing tomatoes in a pot, you can use acquired seeds or use a tomato at home.

How to Grow Tomatoes in Pots in a Greenhouse: Step by Step

Make a Good Soil Mix, With an Addition Of 10% Worm Compost

We already covered that part but let’s revise once again.

Standard potting soil usually has equal parts perlite, vermiculite, and peat. It is adjusted to the proper pH by adding a teaspoon of hydrated lime per gallon of a mix of Earth. Lime is a good source of calcium that prevents rot. Moisten the initial mixture using running water and specific preparation.

Germinate Your Seeds

Ideally, you should germinate the seeds in a seedbed before taking them to the greenhouse. Keep them controlled and in adequate light and irrigation conditions.

Start with small pots for the seeds to germinate. Place them in about 5 to 7 cm of soil and cover them to prevent the soil from drying out. Tomato seeds germinate at 26 degrees. You will be able to see the progress between the 5th to the 18th. The small plants should be placed between 10 and 15 cm of fluorescent light.

Keep the Tomatoes under 2 Or 3 Fluorescent Lights for 18 To 24 Hours

The ideal temperature for tomato growth during the day is 21 to 24 degrees and 18 to 20 at night. When the plants have reached 30 cm, you need to move them to a pot of about 4 liters of capacity. Your plants will be ready to produce in about 6 to 8 weeks.

Before this definitive transplant, check that the pH of the soil is between some values ​​of 5.8 and 6.8. It is also advisable to add calcium sulfate to the soil, which will help prevent necrosis in the crop.

Tomatoes Bloom

60 to 80 days from the moment you start the growing process. At the same time, you can make the last transplant to 11-liter pots. For the first two weeks, feed them with 10-52-70 fertilizers or something similar.

Tomato Fertilizer

Fertilize your tomatoes regularly. Remove the suckers every week, leaving only the main shoot and a single shoot (the tallest one). This way, the plant will grow upwards.

In addition, you will need to stalk your tomatoes. And unless you have your own bees or a large number of them nearby, you will need to pollinate the flowers yourself.

Pollinate the Flowers Each Day As Long As It Is Warm and Humid

Ideally, the humidity will be 65 to 70 percent. In a greenhouse, this is accomplished more or less between 11:30 am to 12:30 pm. The tomato flower is the classic one with the stamen and pistil visibly exposed. The problem with growing greenhouse tomatoes in a pot is that they need a certain amount of vibration in order to release pollen. This is more problematic in winter. For this, you can help yourself with a specific electric garden vibrator.

Temperature for Growing Tomato in Pots in Greenhouse

The first thing when growing tomatoes in a Greenhouse is to control the temperature. The temperature should be kept between 21ºC and 27ºC during the daytime and between 16 º C and 18 º C at night.

In addition to maintaining these temperatures in your greenhouse, it will be necessary to keep the humidity below 90%. Ensuring that the environment is ventilated and with fresh air. Otherwise, you are likely to find yourself with mold problems on the leaves of your tomatoes.


Learning how to grow your own tomatoes is a very satisfying experience. Your tomato production will taste much better than that of the market. The added value of eating what you grow without pesticides or dangerous substances makes one proud. And that’s why we wanted to teach you how to grow tomatoes in pots in a greenhouse.