Updated at: 26-10-2022 - By: Sienna Lewis

It’s understandable that you would be wondering: “When should you plant in a tiny greenhouse?” Every gardener and would-be gardener should own a greenhouse.

Crops may be grown all year round in a greenhouse, which is an advantage. However, you’ll need to pay attention to aspects such as lighting, irrigation, temperature, and the kinds of plants you want to cultivate in order to get the most out of your space.

You also need to alter the greenhouse settings based on the current season, the amount of sunlight your greenhouse is receiving, your USDA zone, and the veggies you’re hoping to grow in your greenhouse.

When should you use a tiny greenhouse to grow plants?

Warm Weather Crops

During March and April, it’s ideal to sow warm-season crops. Most of these plants will germinate in one to two months, and they are not frost hardy.

The final frost should have disappeared by early May, if you reside in a colder or higher-elevation area where freezing temperatures are common during spring. When the temperature hits at least 70 degrees Fahrenheit, it is the optimal time to transplant warm-season crops.

Vegetables such as legumes, tomatoes, vining beans and cucumbers, peppers, potatoes and corn can all be grown throughout the warm season.

When Should You Plant in a Mini Greenhouse? - Krostrade

Cool Weather Crops

Planting cool-season crops in early March is the optimal time to do so. Temperatures between 55 and 65 degrees Fahrenheit are ideal for these vegetables. Early April is a good time to transplant these plants.

It is important to keep in mind that cold-season and hardy crops germinate more slowly than warm-season vegetables (7 to 12 weeks). Broccoli, kale, celery, arugula, chard, and cauliflower are some of the best winter veggies.

Hardy Vegetables

In the months of December and January, you should start your greenhouse garden with hardy veggies or plants that can withstand frost. For a few days, gradually exposing these plants to the outdoors will harden them. In February or March, you can transplant them into your garden.

Swiss chard, beets, carrots, turnips, spinach, bulb onions, and lush salad greens are some of the hardy crops you should grow.

How Can You Protect Your Plants from Frost?

It has been found that most plants cannot withstand freezing temperatures. A greenhouse isn’t the only option for keeping your plants safe from the winter cold.

Cover horticultural fleece

One or two layers of horticultural fleece might help keep your greenhouse warm at night. To minimize overheating, remember to take it off in the morning. The usage of horticultural fleece in your greenhouse can help you save money on your greenhouse’s electric bill.

Install a heating system

Installing a heating system is another option. If you’re going to use or install a space heater, be sure it’s away from combustible objects. Hire a professional to do the installation so that it is done correctly.

HVAC experts can help you calculate the amount and type of heater you’ll need in your greenhouse.

Even if you prefer to grow your plants indoors, keep them warm throughout the cold winter nights. It’s best to have additional protection from frost during nights that are much cooler.

Mini Greenhouse: Is It Worth It?

Yes, in a nutshell. Having a greenhouse is considered a luxury by most people. Mini greenhouses are a cheap and high-quality alternative to more expensive greenhouses.

A greenhouse is a worthwhile investment for the following reasons:

An excellent option for beginners

If you want to learn about greenhouse technology before you invest in a larger one, a micro greenhouse is an excellent solution. Use it to see how greenhouses function and how different crops thrive in an enclosed setting.

Protect your plants from pests and animals

Months of diligent labour can be quickly undone by pests and animals. You don’t want your crops to be eaten by insects or other creatures. Use a greenhouse to keep your plants and crops safe.

Best for gardeners with limited space

Growing your own vegetables is possible even if you have a small yard. With a little greenhouse, you don’t have to miss out on the joys of gardening just because you don’t have much space. Patios, backyards, decks, balconies, and even tabletops are all good places to put them. Even though it is smaller, a mini-greenhouse offers the same advantages as a larger one.

Start planting early

Even before the cold weather sets in, you may get a head start on planting with a little greenhouse. Your crops can then be moved outside your garden as the weather warms up. Your crop will be ready sooner if you do this.

Protect your plants from harsh weather

Placement of your plants in a greenhouse protects them from harsh weather conditions as well as pests and creatures. In a compact greenhouse, your plants can thrive in any weather condition, even if it’s raining outside.

How to Plant Seeds in a Mini Greenhouse

Seed germination is aided by the installation of a mini-greenhouse, which helps to maintain warm soil and air temperatures. Some miniature greenhouses come with a tray or pot for holding the planting medium, while others have an open top that lets light through while also aiding moisture retention.

According to a Seed Collection article, these greenhouses are typically used indoors, but they can also be placed outside in sunny weather if the temperature is above freezing. After the seeds have sprouted, the translucent covering continues to allow light in, producing a greenhouse atmosphere for the early stages of plant growth.

1. Prep the Soil Mix

Depending on the architecture of the greenhouse, use a sterile potting mix to fill the greenhouse planting tray or seedling pots. Make sure the soil tray or pots are submerged in 1 inch of lukewarm water before placing them in the water tray. After 30 minutes of soaking in the water, dump the drip tray of any remaining water and allow the soil to dry out.

2. Sow the Seeds

In the moistened soil mix, sow the plant seeds as instructed on the seed packet, which is normally at a depth of about two times the seed’s diameter. Seed each pot or cell with two seeds, or sow seeds in rows one inch apart in trays or flats spaced one inch apart. After planting, if the soil is too dry, mist it with water.

3. Cover the Tray

In an area that receives bright, indirect sunshine, set the mini-greenhouse between 65 and 75 degrees Fahrenheit on top of a tray. The cover keeps the soil mix moist until after germination, reducing the need for watering.

4. Prop the Cover Up

After the seeds have sprouted, prop open the greenhouse cover to enable the dampness to evaporate. In order to keep one end of the cover raised, use a little stick or pencil.

5. Water the Seedlings

When the earth feels dry, water the seedlings. Soak the soil at the bottom of the drip tray with water so that the seedling leaves don’t get wet, which can lead to fungal illness.

6. Remove the Cover

Before the seedlings are tall enough to touch the plastic, remove the greenhouse cover completely.

Setting Up Your Small or Mini Greenhouse

Extending the growing season is easy with a small greenhouse. Some veggies can be grown year-round if you sow them early in the spring or summer.

Installing the greenhouse, on the other hand, is the initial step in your journey into indoor/enclosed gardening. Consider lighting, temperature, irrigation and humidity control, hygiene considerations, as well as the types of benches to be installed while making this decision.

Here are the essentials you’ll need for your little greenhouse.

The Basics:

Hand tools, pots, seedling flats, and a watering can are all part of a greenhouse gardener’s toolkit.

Biodegradable pots are popular among greenhouse enthusiasts, and if you choose to use them, you will need to keep them in waterproof containers.

I prefer to start my plants in recycled plastic containers, RX bottles, and the like. That way, you don’t have to worry about the pot deteriorating and you discover a new use for things that would otherwise be thrown away.

Containers with lids can be used to combine and store the growing materials, or they can be stored in plastic tubs that have lids. Insect eggs and diseases are kept out of the home-made mediums by the containers.


Shelves, rather than benches, are a more economical option. However, you can merely leave plants on the ground, depending on what you want to grow.

The ability to grow plants in multiple layers is one of the greatest advantages of using benches or shelves. You’ll be able to fit even more plants in a smaller area this way.


Mini greenhouses necessitate a high level of sanitation. Nothing is more upsetting than discovering that an insect, bacteria, or fungus has infiltrated your greenhouse garden and is causing issues or perhaps destroying your entire season’s worth of plants.

Trimmings, leaves, and other plant matter should be removed from the greenhouse after trimming.

Infected or moldy plants should be removed as soon as possible to prevent the spread of disease to other plants.

Irrigation and Drainage:

Enough water is necessary for the plants’ health and growth throughout the year. Investing in drip irrigation or simply keeping an eye on things and watering as needed is the only option.

You may use a hand watering can to water a small greenhouse garden.

In order to adequately drain any extra water, it is imperative that all benches be sloped slightly.

As an alternative, you may want to design the seats to enable excess water to drip off of them.


Lighting for your greenhouse shouldn’t be an issue if it’s located in a sunny, south-facing location.

You may need to buy grow lights if your greenhouse doesn’t get enough sunlight, or if your plants need more light than is naturally available in your area at any one time.

Their care must be increased as the plants develop. Mini and small greenhouses may not be able to afford greenhouse lights, which are a better option.


Investing in artificial shade as the hot summer sun begins to peek over the horizon is a necessity when planting shadow-loving plants.

Your greenhouse will remain cooler during the day if you utilize shade cloth.

What Can You Plant in a Mini Greenhouse? - Krostrade

Climate Control:

If you intend to use the greenhouse all year round, you may want to invest in a small evaporative cooler, fan, or heater.

Off-grid options for keeping a greenhouse garden above freezing temperature include low-cost heaters. Check read my article on how to heat a greenhouse without electricity in the winter.

When the weather is moderate, fans can help to keep a greenhouse from overheating and offer much-needed air movement.

Ventilation and air circulation are two of the most important aspects of preserving the correct climate conditions in a small greenhouse.

Besides a fan, which we just discussed, I strongly recommend purchasing an Automatic Vent Opener for your greenhouse garden.

Use a thermometer and a hygrometer to ensure that your climate control system is operating at its optimal level.

What to Grow in a Mini Greenhouse

You must first determine the sort of small greenhouse you are using and the size of the greenhouse before you can begin selecting plants.

Understanding your structure’s potential will allow you to create an ideal habitat for your plants to thrive.

Standard greenhouses and cold frame greenhouses are two types of greenhouses.

Standard Mini Greenhouses:

It is possible to maintain an appropriate temperature in a standard mini-greenhouse regardless of the weather conditions outside.

Start plants in this form of greenhouse and then move them outdoors once the temperature has settled, depending on where you live.

Even in the summer, temperatures might fluctuate, necessitating the need to keep the plants growing throughout the season.

Cold Frame Greenhouses:

Traditional greenhouses differ from cold frame greenhouse gardens. In order to create a microclimate in the garden, the mini-greenhouses make use of insulation and solar energy.

That makes them ideal for beginning seedlings or transitioning some greenhouse plants before they are placed outside.

They’re most commonly used in the winter to cultivate delicate plants and keep planting soils warm. These greenhouses can be used to extend the growing season of cool-season vegetables or to plant seeds earlier in the spring.

Plants are not overheated by the protection they receive from the elements thanks to these structures.

So, Which Plants Should You Plant in Your Greenhouse Garden?

Despite their modest size, mini-greenhouses should not limit what you can plant. But unless you’ve got a comprehensive climate control system in place, you’ll be limited to the plants you can grow in it.

Here are some examples of crops you can grow in your greenhouse at various seasons of the year, keeping this in mind:

Winter to Early Spring:

If you have an unheated greenhouse, start sowing frost-tolerant vegetables like lettuce, cabbage, spinach, and broccoli in the fall.

Low temperatures are no problem for the plants. As soon as nighttime temperatures are above 30 degrees Fahrenheit, you can move them outside.

Mid to Late Spring:

Plant the vulnerable plants in your little greenhouse when spring and the formal planting season arrive. As long as there is at least 8 hours of direct sunlight, the plants will thrive.

Seeds for delicate crops like cucumbers, melons, and squash should be started indoors so they may be transplanted outdoors as soon as the weather permits. Before transplanting, make sure the plants have not been exposed to frost.

Summer to Late Summer:

Make way in your greenhouse for mid-summer harvests by transplanting the plants sown in the previous season outside.

Plants that thrive in high temperatures, such as tomatoes, eggplants, and hot peppers, should be grown in the greenhouse.

Some plants suffer when kept in a tiny greenhouse at temperatures that are too high. Mold and mildew can also thrive in this environment.

Increase the flow of air into the greenhouse and provide the plants with a suitable environment by integrating ventilation systems in the structure where appropriate.

Autumn & Late Fall:

It’s time to use your greenhouse to finish up the summer plants and grow cool-season crops now that the temperatures are cooling off.

You don’t have to heat the micro greenhouse to produce cool-season vegetables because they are hardiest, unless you reside in an extremely cold place.

Snow peas, kale, and turnips are just some of the vegetables that can be added to your diet today. The rate of development is likely to be moderate, but constant. There are a lot of plants to eat and enjoy in the greenhouse during the winter months.

Starting Seeds in Your Mini Greenhouse

People start seeds in a variety of ways, including conventional seed trays, single plug trays, and hydroponic trays.

After planting seeds, write down the seed label and the date of planting. It’s a good idea to sow seeds and give them time to grow.

Using this information, you may determine how many seeds you need to plant in order to get the desired seedlings. The following is a list of potential seed options.

You can get a head start on your outside garden by beginning seeds in the greenhouse.

Hybrid Seeds:

A healthier option is hybrid seeds, which may be purchased at any garden center. A crossbreed of two plants is referred to as an F-1 seed by the seed industry.

Seeds germinate into large, healthy plants that look and produce identically. You may also be able to reap the benefits of early harvesting.

It’s a bummer that the seeds are more expensive and can’t be kept for long periods of time.

Heirloom Seeds:

The notion of using heirloom seeds is a good one. They’re popular because of the delicious flavors they produce. Furthermore, they develop new genetic types for use in future farming, and they are adaptable to the local environment.

This variety of seed is by far my favorite because the harvested seeds may be kept for a second year, reducing the need for additional seed purchases each year.

Disease & Pest Control:

The problem of disease and insect outbreaks in your small greenhouse garden can quickly get out of hand if you don’t take the right measures to address them.

In order for diseases and pests to thrive in greenhouses, they need three things: host plants that are vulnerable to disease and pests, a suitable environment, and the ability to spread.

All of these issues must be addressed at the same time in an effective pest control program. Here’s how to deal with a few of the most prevalent annoyances.


Aphids are little, soft-bodied sap-sucking insects. Because they don’t require a mate and give birth to live aphids, the insects proliferate quickly.

Aphids feed on plant sap and come in many varieties. Aphids come in a variety of colors, but you’ll be most likely to see the fully-grown ones in your little greenhouse.

There are two distinct types of aphids: those that fly and those that scurry around on the sticky cards.

To identify the leaves, you will need to study the plant’s leaves, particularly the underside. Further evidence that aphids exist can be found in the form of aphid skins and ants. Aphids make “honeydew,” which ants eat.

Aphids can be eliminated naturally.

Fungus Gnats:

In greenhouses, fungus gnats are another sort of pest. Insects that feed on soil organic materials and algae are tiny and long-legged.

If you have pythium-infected soil in your greenhouse, these pests can be a nuisance, as well as carry soil-borne diseases that can harm your crops.

A swarm of mosquitoes will be hovering at the base of your greenhouse plants and other damp places. It is possible that the soil is also home to white fungus gnat larvae.

Sticky traps around the base of the plants are an effective approach to catch these pests.


In greenhouses, whiteflies are a regular pest to expect. The pests resemble aphids in appearance and size.

When disturbed, they fly away since they are winged and white, unlike aphids. They eat on plant sap, just like aphids, and can produce “honeydew” residue at various stages of their life cycle, as well.

In your greenhouse, you’ll most likely find them on the sticky traps and among the plants. If they aren’t kept under control, fruit and foliage damage will occur, perhaps resulting in restricted plant growth.

Insect screens can be used to keep pests out of greenhouses. Aphids and whiteflies won’t bother your plants if your greenhouse is free of superfluous plant material, debris, and weeds.

Some people spray them with neem oil to kill them, while others employ water blasts to knock them off the plant. Small greenhouses can benefit from yellow sticky traps.

Slugs and Snails:

When the humidity levels in your little greenhouse are high, slugs and snails will thrive. Keep your greenhouse clean, and you’ll be able to keep the creepy, crawly, and slimy critters at bay.

A wet hiding place and cooling can be provided by uprooted weeds, old boards and leaves in the greenhouse.

If you have a problem with slugs or snails, we have a piece on how to get rid of them naturally.


In greenhouses, spider mites predominate over all other species of mites. They can be green, brown, or red in color, and they are quite little.

As the population grows, you may notice fuzzy webbings on the underside of your plant leaves as well.

Predatory mites can be released as an early intervention or preventative measure. Make sure the greenhouse doesn’t get too hot or dry by keeping an eye on the weather.

These spider mites thrive in dry greenhouse climates, or in microclimates that are close to the heat source, such as near the air conditioner.

Spider mites are more likely to attack plants that have been over-fertilized. Control the number of spider mites by using safer soaps or insecticides, such as neem oil.

Powdery Mildew:

Fuzzy white fungal spores develop on plant leaves as powdery mildew. Plants grown outside of greenhouses can also be affected.

But broadleaf plants are the first to show signs of the disease. This fungal disease can thrive in any greenhouse, but the plant leaves must be kept moist to be affected.

Increase the greenhouse’s airflow with circulation fans and remove any old, overgrown plant leaves from dense plantings to allow more air to reach the canopy.

Increase ventilation in the greenhouse to lower the level of humidity. Additional options include a dehumidifier and a heating system for the nights.

Powdery mildew can be prevented and treated by the use of potassium bicarbonate (baking soda), sulfur burners, or commercial sprays containing potassium bicarbonate, such as foliar spray.


If you don’t have a magnifying glass, you can only view thrips with the aid of your hands or a hand lens. Western flower thrips, however, are the most common among the many different thrips species.

On plant leaves, they primarily produce patterned silvery areas with little black flecks. Pests generally damage leaves by scraping and sucking chlorophyll, which reduces a plant’s capacity to photosynthesize.

A thrips infestation may also be indicated by the appearance of deformed flowers or a reduction in plant size. Adult thrips can be caught on blue or yellow sticky cards that are used to monitor the number of thrips.

This includes checking the leaves of plants and growing little flowers like petunias that attract thrips.

Thrips populations can be difficult to control once they have become established. As a result, the only option is screening for early detection of disease.

Predatory mites, on the other hand, can be used to eliminate thrips in various phases of development. It’s also useful to have beneficial nematodes on hand.

What can you grow in small plastic greenhouse?

To learn about different cultivars of a particular plant, simply click on its name.

  • Aubergines.
  • the green vegetable broccoli (germinating seeds in early spring)
  • Lettuce Begins to Grow (germinating seeds in early spring)
  • Bok Choy (germinating seeds in early spring)
  • Head of Cauliflower (germinating seeds in early spring)
  • Chillies.
  • Peppers that are sweet and sour.
  • Cauliflowers (before planting out)

Are small plastic greenhouses any good?

When it comes to a little garden or allotment, a plastic mini greenhouse is a great addition. They excel at seed germination and plant cloning, respectively. Mini plastic greenhouses also have the benefit of being portable and taking up a small amount of space.

What can you do with a mini greenhouse?

Summer. The Mini greenhouse can be used in the summer to shelter crops such as tomatoes, peppers, cucumbers, and aubergines from the elements. Homegrown Mediterranean crops can take advantage of any remaining space once the other plants have been established.

What plants do well in a small greenhouse?

Greenhouse-Raised Plants

  • Geraniums.
  • Impatiens.
  • Petunias.
  • Salvia.
  • Caladiums.
  • Ferns.
  • Poinsettias.
  • Chrysanthemums.

Can strawberries be grown in a greenhouse?

In a greenhouse or conservatory, strawberries can bear fruit up to a month earlier than they would in the wild. It is possible to speed up the ripening of your strawberry plants by up to three weeks if you use cloches to cover your plants in February.

Do cheap plastic greenhouses work?

Inexpensive plastic sheeting works well, although it degrades quickly (see How to make a cheap and easy greenhouse). Polycarbonate is cheaper than glass, lighter, and better at retaining heat than both glass and plastic.

Will a small plastic greenhouse protect from frost?

In fact, plastic greenhouses are effective in keeping plants safe from the winter cold. A plastic greenhouse will keep the greenhouse temperature at least 5 degrees higher than the surrounding environment. As a result, a plastic greenhouse will provide adequate winter protection for your plants.

Mini Greenhouse Growing Guide - Access Garden Products

Should a greenhouse be in full sun?

For the best chance of success, you should place your greenhouse in a location that receives a lot of sunlight, natural light, and is shielded from wind and frost. Due to inadequate drainage and lack of sunlight, some gardens have parts that are moist or susceptible to surface water.

Does a mini greenhouse need ventilation?

Yes, it is true that greenhouses require some form of airflow. In fact, a greenhouse’s ventilation system is one of its most critical components. The following are the primary functions of a ventilation system in maintaining the health of plants. For healthy plant growth, you’ve learned that proper greenhouse ventilation is essential.

Can I grow tomatoes in a mini greenhouse?

During the early stages of a Mini greenhouse’s growth, when the Mini greenhouse is full with vulnerable plants waiting for the threat of frost to pass, tomatoes make an excellent Summer yield. Tomatoes have more room to develop when these plants are removed at the end of May.

What can I grow in a small greenhouse in spring?

Winter’s end to the start of spring

  • Brussels sprouts, cabbage, celeriac and early leeks are some of the hardy plants that can be started now to be planted out in the spring.
  • Tomatoes, peppers, and other sensitive plants can be started in a propagator in heated greenhouses.

What fruit and veg can I grow in a small greenhouse?

Our Favorite Plants for a Greenhouse Garden

  • Peppers. For greenhouse cultivation, the vast majority of pepper types may be grown because they are natively found in warmer climes.
  • Tomatoes.
  • Cucumbers.
  • Roots.
  • Calabrese/Broccoli.
  • Sweetcorn.
  • Squash.
  • Sprouts of Brussels.

What can I grow in my portable greenhouse?

Is There Anything You Can Grow in a Mini Greenhouse?

  • Tomatoes.
  • Peppers.
  • Eggplants.
  • Asparagus.
  • Lettuce.
  • Cucumbers.
  • Salads.
  • Cabbage in Season.

When should I start plants in my greenhouse?

You can start seeds in greenhouses at any time because of the controlled environment. However, if you’re planning to start plants in greenhouses for spring planting, you should do so 6-8 weeks before the last projected frost date in your area if you’re starting seeds.

The Bottom Line: When Should You Plant in a Mini Greenhouse?

Which time of year should you utilize a greenhouse? All year round gardening is possible with a little greenhouse, so you don’t have to worry about bad weather or changing seasons!