Updated at: 28-04-2022 - By: Sienna Lewis

If you know how to plant and care for tomatoes in a little greenhouse, you’ll have an endless supply of this delicious and nutritious fruit and vegetable year after year. The little greenhouse will ensure that your crops grow nicely, no matter how little space you have. A tiny greenhouse will make it simpler for novice gardeners to try their hand at tomato cultivation.

Another benefit of growing tomatoes in a greenhouse is that you may do a two-crop rotation each year by sowing in the autumn and spring. With a little planning, you can get a lot of benefits from your little greenhouse with no effort. Nevertheless, growing tomatoes isn’t for the faint of heart, so keep reading for some pointers on how to build a productive little greenhouse.

How To Grow Tomatoes In A Mini Greenhouse For Success

What tomato varieties to get for a mini greenhouse?

It’s imperative that you familiarize yourself with the best tomato types for a little greenhouse before you begin planting. Since the conditions in the greenhouse are conducive to their growth and productivity, success is virtually assured. However, your greenhouse’s good heat already gives you an edge because tomatoes flourish in direct sunlight.

How to Grow Tomatoes in Greenhouse | Greenhouse Tomatoes Guide

Because of their versatility, field tomato cultivars aren’t recommended for greenhouse farmers, says the University of Massachusetts Amherst. Because they are specifically bred for greenhouse cultivation, Dutch hybrid indeterminate types are an excellent choice. Mini greenhouse makers recommend Ailsa Craig, Black opal, Capprica, Ferline, and Sungold for the use of the greenhouses.

How to plant tomatoes in a mini greenhouse?

Two-crop vs one-crop

Plant two crops of tomatoes in the little greenhouse or just one crop in the micro greenhouse. A two-crop system is possible in Mississippi, where you can plant in both spring and fall. Because most places have hot summers, this normally occurs in the spring with a one-crop system.

Soil culture vs hydroponics and vines vs bushes

When it comes to growing tomatoes in your little greenhouse, you’ll need to select whether you prefer soil culture or hydroponics methods. Both methods need dirt to grow the roots, but only one employs an artificial soil mix to do so. For the little greenhouse, it’s ideal to grow tomatoes as vines rather than bushes, as shrubs take up more area.

Planting seeds in a seed tray can be done once you’ve chosen your cropping and production method. Choose a spot in the greenhouse that isn’t directly exposed to the sun but is yet warm enough for your plants to grow. To avoid disease, keep the compost moist but not soggy.

Before potting, transport the seedlings to a light location and wait for 60 days. If the tomatoes grow at least 6 to 8 inches tall, you can plant them outside or put them in the greenhouse, depending on your preference. Keep the temperature in the micro greenhouse between 70 and 80 degrees Fahrenheit during the day, and between 60 and 65 degrees Fahrenheit at night.

How to care for tomatoes in a mini greenhouse?


Tomatoes necessitate a lot of water, but too much water can also be detrimental to their growth. When gardeners neglect to water the roots, diseases and pests are more likely to spread through the soil. If the soil is dry, the amount of water needed will be less frequently.


Testing the soil is the greatest approach to find out what fertilizer is best for your tomatoes. When the fruit is close to its final size and ready to be harvested, you can apply fertilizer. Feed immediately afterward to avoid scorching.

Ventilation and humidity

Keeping the humidity in the tiny greenhouse between 60 and 70 percent is as important as the temperature. In this method, disease risks can be reduced, and pollination can be improved. Always keep an eye on the ventilation and make necessary adjustments based on the temperature outside.

Weeds and pests

Mini greenhouse weeds can be controlled using mulching and fumigation. Keep in mind that no pesticides are available for use in greenhouses. Pests in the micro greenhouse can be prevented with adequate cleaning and monitoring.

What are the companion plants for tomatoes in a mini greenhouse?

Tomatoes and companion plants can be grown in a small greenhouse. It’s a great method to save space and have plants that benefit from each other. Companion planting You can avoid pests by planting other crops alongside tomatoes if you plan ahead.

To combat pests and attract beneficial insects like ladybugs, herbs like fennel and dill are useful. Other plants, such as mint, also contribute to the betterment of tomato health and flavor. Marigolds and tomatoes create a beautiful combination in a small greenhouse.

Tomatoes plant care


Getting a handle on how much water your tomatoes require is the first step in proper care. A decent rule of thumb is to over-water, then wait until the soil is dry before re-watering. Depending on how quickly the soil dries out, you should water your plants every day or every other day. Misting the plants has its advantages as well. This supports the fruit by distributing water uniformly, preventing over-watering, reducing soil on the leaves, and preventing the soil from building up on the leaves. To avoid spreading illness, avoid splattering moist soil or water on the leaves of your plants.

The best time to water your plants is in the morning, and you should stop about two to three hours before sundown to avoid overwatering. Irrigation systems can help you remember to water your plants and ensure that they receive a steady supply of water. Tomato plants need a lot of water, but they also need to be able to drain that water away. You may avoid your plant from drowning by using a pot that has holes in the bottom to allow excess water to drain.


You may assist your tomatoes develop by placing them near a window or using high-quality grow lights. Plants are also warmed by sunlight or artificial light, as well. The light will assist the greenhouse in reaching the ideal temperature range of 70-75 degrees Fahrenheit, where they thrive best.


Using stakes is essential to prevent the plant from collapsing. Stakes made of bamboo are commonly used by gardeners. Tie the plant’s stem to the stake as it grows. Every half-foot of the stalk should be tied with a piece of twine.

Best tomato varieties for a greenhouse

Determined and intermediate tomato plants exist. The bushes of determinant plants are smaller and take up less room than those of less tenacious plants. The tomatoes all ripen at the same time and the plants are smaller in general, making them ideal for large pots. The stems of intermediate tomato plants tend to be larger and taller, need additional support from stakes or cages. Determinate types are better suited to cramped quarters, although they are thought to be worse in taste. Varieties in the intermediate range can grow to a height of 10 feet, but their flavor tends to be better. Miniature and dwarf tomato plants are a popular choice for small greenhouses because of their compact size.

Sungold, Cappricia, Gardener’s Delight, and Sweet Million are some of the most popular greenhouse tomatoes. When it comes to pots and greenhouse space, the Sweet Million variety is the ideal fit. It is possible to grow a wide variety of tomatoes in a greenhouse, including the kinds listed above. It is possible to extend the life of the plants in a greenhouse without heating (i.e. growing the plants indoors without a heat lamp). However, it is possible that some kinds will not thrive in the lower climate. Reading the plant and seed variety information is critical to determining the variety’s needs. ‘

How to Grow Tomatoes in Greenhouse | Greenhouse Tomatoes Guide

How do you prepare the soil for the best crop yield and plant health?

fertilizer and nutrients are necessary for the growth of tomato plants. Adding compost to the soil is the first step. The compost should be added to the soil and worked into it, which means that it should be thoroughly incorporated into the soil. The compost breaks up the soil, which aids in root growth and health, and it also supplies necessary nutrients. You’ll then need to dig a hole for the tomato plant, fill it with fertilizer, and plant the tomato. Tomatoes prefer high-phosphorus fertilizers.

It’s important to strike the right balance once again. In a greenhouse where there is no natural rainfall, compost can be too strong for plants to handle. Compost can burn plants if you use too much of it. Leaves or hay can be added to the compost to neutralize it.

It is important to do a soil test before applying fertilizer in order to choose the optimum product. Fertilizers should contain phosphorus, potassium, calcium, nitrogen, and magnesium in high concentrations. As soon as you plant your tomatoes and when the fruit reaches about a third of its final size, fertilize them. To avoid burning, apply the final two fertilizers approximately 4 inches from the stem.

Tomato plant problems

Tomatoes are prone to a number of issues:

  • You didn’t plant them correctly: As previously mentioned, each variety has its own unique set of growing requirements. There are many who will need a lot of room or a lot of stakes, while there are others who will be fine with close quarters. Take a look at the plants you planted to see how far apart they should be placed.
  • If you grow tomatoes in the same spot year after year, the earth will get depleted of nutrients. As a result, the tomatoes will ripen unevenly, resulting in increased disease and decreased yields. To avoid this, either rotate the location of your tomato plants every year or use a fertilizer that contains the necessary nutrients before replanting.
  • Tomatoes suffer from a lack of water. For further information on watering, see the section on tomato plant maintenance.
  • The tomatoes will crack if they are over-watered.
  • While nitrogen-rich fertilizer benefits the foliage, it reduces the amount of tomatoes that can be cultivated.
  • Pheromones or pathogens

What do you do if you find pests or disease on the tomato plant?

An aphid, cutworm and whitefly are some of the most prevalent pests. However, many of these pests may be controlled by good plant care. Whiteflies and aphids are the most frequent pests to deal with, but your tomato plant can also be harmed by other insects. Additionally, the following steps can be done to guarantee insect control:

  • Leaves strongly infested with aphids should be removed. Aphids can be eaten by ladybugs or by spraying insecticidal soap on the plant.
  • Put cardboard cones around the seedlings to control cutworms.
  • There are a number of ways to deal with flea beetles, including placing sticky traps, covering young plants, or using particular insecticides.
  • Rotate the plants and sterilize the soil if necrotizing nematodes are a problem (this is expensive and toxic so should be a last resort).
  • Insecticides, ladybugs, sticky traps, and watering with a spray hose are all ways to get rid of whiteflies.

There are a lot of diseases, but they all share the same preventative measure. Plucking weeds, rotating crops, and removing unhealthy leaves and fruits are all good places to start. Also, don’t smoke near the plants and wash your hands completely before handling the plants if you smoke. Ventilating the greenhouse is another important step. Tobacco has the potential to spread a variety of diseases, which is why it should never be kept in close proximity to tomato plants. It is possible to limit the danger of illness in tomato plants by taking necessary safeguards. Imagine that you wash your hands, take vitamin C, and give your plants the nutrients they require to keep them healthy like you do for yourself.

How is growing tomatoes different than growing other vegetables?

A temperature range of 70 to 75 degrees Fahrenheit is ideal for tomato plants, as is a lot of sunlight. When planning your garden, this is a good rule of thumb to keep in mind. Tomatoes don’t go well with plants that require shade, so keep that in mind when pairing them. Also, in order to maintain a healthy and disease-free environment, tomatoes often require a greater separation from other plants. They need their own pot, whereas other plants can share a pot without issue. Tomato plants, too, require stakes to keep them from falling over. Due to their smaller weight, other veggies do not require the supports.

If you’re growing tomatoes in a greenhouse, you may have to manually pollinate the plants. Pollination is generally done by the wind, but in an air-tight greenhouse, you will have to do it manually. With an electric toothbrush or simply a gentle shake of the stem, you can vibrate and release the pollen from the plant.

Is it a fruit or a vegetable?

One of the five most popular fruits in the world is the tomato. What about fruits and vegetables? I bet you’re wondering what it could be as well. Did you know that the Supreme Court of the United States ruled in 1893 that tomatoes are vegetables, despite the fact that they are considered fruits in the botanical sense?

Tomatoes, on the other hand, are considered vegetables by nutritionists and the horticulture industry, according to the USDA. While “fruit” is used to describe anything that is sweet, “vegetable” refers to something that does not contain a lot of fructose. A tomato, on the other hand, is obviously a fruit from a botanical perspective. So, a tomato is technically the fruit of a tomato plant, but it’s also considered a vegetable by cooks.

Choose the type of tomatoes you want to grow in your greenhouse

Tomatoes come in a wide range of flavors. They each have their own own variety of fruit, flavor profile, and application in the kitchen. Here are a few things to consider:

Cherry tomatoes

They are the tiniest and tastiest of all tomatoes, and they are also the most flavorful. Salads and pasta dishes benefit greatly from the addition of these items to the menu.

Plum tomatoes

It’s hard to go wrong with a plum tomato for an appetizer or soup because they’re meaty, less seedy, and taste great when they’re dried. Cherry tomatoes are slightly bigger and oblong in shape.

Beefsteak tomatoes

Weight-wise, the beefsteak tomato is the heaviest, averaging over 200g. Grilling, packing, and sandwiches all benefit from the lean texture of these tomatoes.

Cordon or indeterminate tomatoes

There is no end to the development of an indeterminate plant. The fruit is transported by the shoots that emerge from the main stem. Harvesting continues for a long time. When the soil temperature rises to at least 55°F, you can easily put them in raised beds, grow bags, or transfer them into the garden. The stakes are high, so back them up. This is the most common kind, and it’s bred to have only one stem, with no side shoots.

Bush or determinate tomatoes

If you’re looking for plants that can thrive in confined settings, then determinate plants are your best bet. Cordon, on the other hand, matures more slowly than this type. In hanging baskets, they are referred to as a dwarf variety. Pruning is the last thing on their minds.

All of their fruit ripens at once. In order to get the best results, they should be grown in large containers, raised beds, or grow bags. Use at least five-gallon containers. Drainage holes are needed in the pots. Put in new potting soil that’s easy to work with. Preparation is key. Constant watering is necessary for container plants. Because these are your tomato’s fruiting shoots, never prune the side shoots.

Semi-determinate tomatoes

Bush tomatoes are related to semi indeterminate types. They are grown as determinate plants, but produce smaller plants.

How to set up your greenhouse for your tomatoes

As a first step, make sure the temperature is correct, then choose the suitable tomato type and medium for your crop. Finally, set up the irrigation system as directed.

  • Temperatures of 70°F to 80°F during the day and 60°F to 65°F at night are ideal for growing tomatoes. When you produce tomatoes in a greenhouse with proper internal heating, you can expect greater expected yields.
  • Seeds labeled as ‘greenhouse varieties’ are better suited for greenhouses since they are more adaptable to the circumstances. The initials VFNT and A after the type’s name denote its resistance to disease. Consult with local farmers if you’re unsure about what seeds to buy. With their abundance of knowledge, you’ll be able to find your way around with ease.
  • tomato plants flourish on a well-drained media such as Rockwool slabs or perlite bags; vermiculite and sphagnum peat moss combined in the ratio 1:1; or soilless medium.
  • Drip irrigation systems are preferred because they deliver water continuously to the roots and can also be used to automatically apply fertilizer.
  • Leaf mold can be prevented by keeping moisture levels below 90%. Fresh, dry air is provided via regular ventilation, which is especially important in the winter.

How to grow tomatoes in a greenhouse

  • Use a soilless tray, seed nutrient solution, or any combination of the two. There are RSI Hydroponic Floating Seeding Trays that will help you transplant your tomatoes successfully.
  • Prepare the tray by soaking it in water or a nutrient solution to make it moist. The fertilizer solution should be used in a soilless tray, while water should be used to moisten the soil.
  • A few droplets of water can be squeezed into a mass with plain water until the mixture is sufficiently wet to squeeze into a mass.
  • Make certain that the trays are exposed to adequate lighting. Even in the winter, your seedlings will be able to thrive thanks to these grow lights.
  • Every cell in your seeding tray should have a quarter-inch hole drilled into it. Each hole should have a single seed inserted. Apply the potting mix with care. Plant an additional 10 to 15 percent of the seeds you wish to cultivate in order to discard the seedlings that aren’t doing well.
  • It usually takes one or two weeks for the seeds to grow.
  • Then, when they’re about four to six inches tall, transplant them into larger pots. These raised beds can provide your tomatoes with enough room to grow.
  • Apply nitrogen and potassium fertilizer on a regular basis.
  • Removing weekly the offspring. Don’t leave anything behind that could die.
  • If you want your vines to grow straight and wide, you need use trellises or posts.
  • When the tomato plants start to bear fruit, you may also need to employ a mechanical pollinator to help pollinate the blossoms and prune the leaves. The VegiBee Garden Rechargable Pollinator can be found here!
  • Protect them from the frigid temperatures and strong winds that might devastate them.
  • Planting larger species in smaller containers may result in fewer fruits being produced. Keeping them close together might lead to a lack of air circulation, which can lead to the spread of disease.
  • Before making one final transplant, check that the greenhouse’s calcium and pH levels are just right.
  • Mix one teaspoon of hydrated lime into one gallon of potting soil for acidic soil.

Tomatoes can be grown around the greenhouse’s edge, where they will have plenty of room to climb, get plenty of sunlight, and have access to water for the most of the time. But they may not have enough water to keep themselves healthy. Planting in pots and bags should take this into consideration.

Instead of constantly bringing your tomatoes in and out of the greenhouse to ensure they receive adequate air and sunlight, keep them in the greenhouse. Planting and raising Arcus in your greenhouse is simple thanks to the Arcus. Opening the sidewalls allows bees and other helpful insects to visit and pollinate your plants at any time.

Introducing a greenhouse that is completely ventilated without the need for additional ventilation. The fresh breeze is all you need to feel after sliding up those walls. Polycarbonate walls provide structural integrity, insulation, and UV protection. It may be used on a wide range of surfaces. Enjoy the summer and feel safe and secure throughout the winter months. Find out more about Arcus Greenhouses by clicking here!

How to Grow Tomatoes in a Greenhouse | Greenhouse Emporium

Pests and disease control

  • Remember to ventilate your greenhouse on a frequent basis during the summer to prevent pests and diseases from infesting your plants.
  • To avoid pests and root illnesses, it is best to change the soil before starting a new batch of tomatoes.
  • Soil should be kept wet at all times; however, over watering can lead to damping-off disease and extra mold problems.
  • The leaves of tomato plants are vulnerable to disease if they are watered with an overhead irrigation system.
  • Preventing the growth of the grey mold fungus by thinning the fallen leaves.

Your tomatoes’ stems or fresh leaves may be covered in those thick clusters of microscopic aphids. It is not a major deal if only a few people are affected. Do not hesitate to use your thumb to smash the pests, as they might purposely damage or even destroy your crop. Get rid of the aphid-infested leaves by cutting them up and throwing them in the trash, not on the ground. If the problem persists, use the organic insecticide detergent.

Viruses can cause a person to become damp. This disease affects young, healthy seedlings that develop a black wound at the soil line and then swiftly wilt and decay. This pollution can be caused by overcrowding, overwatering, and cool, damp soil. During the first two weeks after germination, be sure to use clean potting soil, seed trays, and other accessories to reduce the rate, prevent packed seedbeds, and control watering carefully.

This disease is caused by a fungus that attacks tomatoes, potatoes, peppers, and eggplants in the soil. When the vines are mature and the green fruit begins to develop in size, there are usually no warning signs. A sliced stem will expose brownish, smeared tissue when the leaves on your plant turn yellow at this point. In order to eliminate the wilt parasites from the damaged ground, crop rotation is an effective strategy. This disease thrives in damp, cool conditions. When it’s freezing outside, don’t mist leaves with water.

Water your tomatoes properly

If you want a big harvest, water your plants frequently. When tomatoes are thirsty, they’ll do anything to get it. If you have access to rainwater, you can use that instead of tap water.

Harvesting your tomatoes

More time spent on the vine means a more flavorful and vibrant tomato. Depending on how full and red you want them to be, harvesting can take place at any time of the year. In order to avoid decomposition, do not leave them out in the sun to ripen. Early in the morning is the optimum time to pick tomatoes.

How to properly store tomatoes

Because they don’t freeze well, tomatoes are best consumed fresh from the plant. For best results, keep it in the fridge for no more than a week. If you have a lot of tomatoes, you can freeze them.

You can buy tomato seeds here if you’re ready to get started.

Related Questions

Can you grow tomatoes year round?

Yes, that’s the quick response. Tomatoes can be grown year-round in a greenhouse with proper climate and soil management.

Can tomato plants be overwatered?

Cracks in the tomato fruit and lumps on the leaves are two early indicators of overwatering tomato plants. There may be persistent puddles of water surrounding the plant in the soil if the problem is severe.

When should you plant tomatoes in a greenhouse?

Six weeks before the final frost date is traditionally when tomato seeds are planted. This usually takes place in April of each year. Your seeds can be sown in the greenhouse sooner than in April because frost isn’t an issue. As long as the conditions and climate are maintained, you can grow them all year round in a greenhouse.


Consider growing tomatoes in a little greenhouse if you want a constant supply of fresh, nutritious, and delicious tomatoes. When it comes to growing tomatoes in a compact greenhouse, the process can be broken down into planting and maintaining the plants. Tomato-growing guides are available from several university extension services.

Why have a tiny greenhouse? Keeping an eye on the internal conditions of the greenhouse is simple because of its small size. Tomato gardening beginners who don’t want to be overwhelmed should choose for this method.