19 Best Vegetables to Grow in Greenhouses

Are you looking for a way to get into the gardening scene? Maybe you don’t have much space for a garden, or perhaps you’re just unsure where to start.

Greenhouses are a great way to get into gardening, and they can be used to grow a variety of different vegetables. In this article, we will discuss some of the best vegetables to grow in greenhouses.

Growing vegetable crops in a greenhouse has many advantages over growing them outdoors. Greenhouses provide a controlled environment that can extend the growing season and protect plants from bad weather, pests, and diseases.

They can also help you grow rare or delicate greenhouse plants that wouldn’t survive in your garden.

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Why grow vegetables in a greenhouse?

One of the best reasons to grow vegetables in a greenhouse is that you can extend the growing season. With a greenhouse, you can jump into the growing season by planting early in the spring, and you can also extend the season into the fall by planting later in the summer.

It allows you to harvest fresh vegetables all year round, even in areas with harsh winter months.

Utilizing a heating system for heat-loving plants integrated with your greenhouse is yet another strategy you may employ to combat the lower temperatures that occur in the late fall, winter, and early spring.

Why do plants grow better in a greenhouse?

Greenhouses can be quickly constructed. Because they control their environment, most of these outdoor locations are preferred. For example, use an automatic water clock setting. It can help you save time or regulate the environment depending on the seasons or daytime situations.

Greenhouses offer a nurturing and humid environment, which is attractive for various plants. Greenhouses also give shelter from the wind and rain, which can harm plants.

It also helps to increase carbon dioxide levels and accelerate leaf development and stem growth. It boosts the chances of early fruit formation and blooming. Greenhouses are functional structures that allow gardeners to grow crops all year round. It opens up all kinds of possibilities in all seasons.

Many people, especially newbies, will still struggle to identify what to grow in a greenhouse. Today, we want to make that process a bit easier for you. We will explore and identify some of the best vegetables to grow in greenhouses.

Vegetables are some of the most common greenhouse plants. With the right greenhouse, you can have a steady supply of fresh vegetables in and out of season. Greenhouses ensure that your crops are protected from harsh outdoor weather conditions they’d otherwise face, including:

• Drought
• Wind
• Blistering heat
• Pests
• Diseases
• Bone-chilling cold
• Critters

A greenhouse vegetable garden can flourish in all seasons and weather conditions. A gardener can create crops’ most suitable conditions by controlling factors such as:

• Temperature
• Humidity
• Moisture
• Watering
• Light
• Fertilization

So, which are these ideal vegetables to grow in greenhouses?

Best Vegetables for Greenhouse Growing

One of the best things about greenhouse gardening is that you can extend the growing season. With a little planning, you can have fresh vegetables all year round.

If you’re thinking of growing vegetables in a greenhouse, here are some of the most recommended starter plants to try.

1. Tomato

Growing tomatoes is easy; they can be grown outdoors and in a greenhouse with very little effort. Tomatoes are great year-round vegetables for greenhouse growers.

They’re also very good for you. Since they have high levels of lycopene, tomatoes are excellent agents that help unclog arteries and are suitable for your heart health.

To grow tomatoes, you must pick a variety that resists diseases such as fusarium and verticillium. Tomatoes come in thousands of varieties that vary in shape, color, size, and flavor – so this might take you a while.

Some of the most common types include:

• Cherry tomatoes
• Beefsteak tomatoes
• Plum tomatoes
• Cordon tomatoes
• Roma tomatoes

You can choose a seedbed or a seedling tray to plant the tomatoes in your greenhouse. Tomatoes seeds germinate within one or two weeks. Transplant them into small pots and later to larger ones after reaching four to six inches.

Apply fertilizers rich in nitrogen and potassium immediately after noticing the second set of true leaves. Also, you should remove or pinch off suckers or the side shoots that usually emerge at the spot where a leaf meets the main stem weekly.

Stake the tomatoes or use trellises for them to climb and spread out. You may need to use a mechanical pollinator to pollinate the flowers. Prune leaves once your greenhouse plants begin to produce fruit.

A drip irrigation system is recommended to provide a constant water supply directly to the root system. Damp soil can promote diseases so avoid overwatering.

Tomatoes love hot temperatures and cannot stand frost. Ensure the plant receives enough sunlight to avoid pale and frail plants. Tomatoes’ best temperatures range between around 70°F to 80°F during the daytime and 55°F to 65°F night time.

See Related: Best Glass Greenhouses in 2023

2. Turnips

Turnips are a mustard family plant that produces plants quickly. After planting, they are capable of sprouting vegetables within weeks. Both the green leaves and the round root are edible and taste lovely in a salad or as a garnish for other dishes.

Turnips, like other root crops, are extremely nutritious and adaptable worldwide. Before planting, practice succession planting. This involves seeding crops at intervals of 7 to 21 days in order to maintain a consistent supply of harvestable veggies.

Succession planting also involves planting a new crop immediately after harvesting the first crop. Combining your compost with soil is a good idea. They must be maintained at the proper humidity levels, though.

3. Carrots

Carrots are one of the most nutritious root vegetables and can grow all year round. They are an excellent source of vitamin A and carotenes. This crop can tolerate frosty as well as warm temperatures.

You can grow them during the winter, spring, and fall seasons. Planting carrots in a greenhouse is easy. You just break up the soil with a rake to create a well-aerated soil structure. Loose soil will allow the seedlings to develop deep and strong roots.

The crop requires just a small amount of fertilizer applied once a week. There are two common carrot seeds, including heirloom and hybrid seeds. Heirloom seeds are open-pollinated, whereas Hybrid seeds are produced artificially by crossing two or more types of a particular species.

When planting carrots, separate them with a six-inch space. You can sow them into a raised bed, a larger planter, or the ground. Maintain moist but not soggy soil.

Carrots typically take 2 to 4 months to ripen though this largely depends on the type and the growing conditions. You’ll notice that the leaves start to wither when the carrots are ready for harvesting. Before harvesting them, loosen up the soil with a garden fork.

See Related: How to Start Growing Mushrooms in a Greenhouse

4. Spinach

Spinach is a leafy greenhouse crop that belongs to the Amaranth family. This crop grows all year round and thrives in cool temperatures.

Spinach is a very nutritious plant that can be eaten raw or cooked. When compared with other green veggies, spinach has higher levels of:

• Vitamins A, B, and C,
• Iron
• Calcium

Spinach thrives in well-drained nutrient-rich soil. Planting spinach requires making beds with aged manure at least a week before. Then, plant them in a nursery, and once the seedlings start to sprout, transplant them a couple of inches apart.

Ensure that you keep the mulch and soil sufficiently moistened. A temperature of between 70°F and 75°F is preferred to increase germination. Shortly after adding fertilizer, ensure that you water them regularly.

Spinach requires regular watering of up to at least two inches every week. Also, ensure that they are exposed to sunlight and shady conditions.

Harvest them when they are mature enough to eat by removing the outer leaves. Leave the core leaves to grow bigger and to continue increasing in size.

See Related: Are Greenhouses Bad for the Environment?

5. Green Onions

Green onions, also known as scallions, are a type of onion that has a milder flavor than other onions.

Green onions grow better in a greenhouse because they prefer warmer temperatures than other vegetables in the same family. A greenhouse can also provide the moist environment they need to thrive because the greenhouse can use different tools to regulate its temperature.

6. Eggplants or Aubergines

One of the best vegetables to plant in a greenhouse is eggplant. Eggplants (aka aubergines) enjoy warm weather and need plenty of sunlight, so they are perfect candidates for greenhouse gardening.

They are also relatively easy to grow and don’t require much care, making them a good choice for beginner gardeners.

In addition, when choosing an eggplant variety to grow in your greenhouse, many options are available. Some of the most popular types include ‘Black Beauty,’ ‘Japanese Black Trifele,’ and ‘Pingtung Long.’

To get started, you will need to purchase some eggplant seedlings; from it comes time to transplant your eggplants into the greenhouse, be sure to space them 18-24 inches apart. Eggplants need room to grow, so don’t overcrowd your plants.

Eggplants require a lot of water, so keep the soil moist but not soggy. You may need to it comes to feeding your eggplants; a general-purpose fertilizer will suffice. Apply the fertilizer once every two weeks and water it in a well.

Eggplants are typically ready to harvest 65-80 days after transplanting. To tell if your eggplants are ripe, look for firm and glossy fruits. When planting eggplants in a greenhouse, you should ensure that the soil is well-drained. Add compost to the soil to help improve drainage and add nutrients. Then, plant the eggplants a couple of inches apart.

Make sure to water them regularly, especially when they are first planted. Eggplantsplants like warm weather and need plenty of sunlight, so they are perfect candidates for greenhouse gardening.

See Related: Best Greenhouse Lights for Plant Growth

7. Asparagus

Asparagus is one of the best vegetables to grow in a greenhouse. It can be planted in early spring or late fall as a cool-weather crop.

Asparagus seeds thrive in moist, well-drained soil and don’t require much fertilizer or water. In addition, asparagus is a perennial crop, meaning that it will produce spears for several years with proper care.

As a result, growing asparagus in a greenhouse can provide a steady supply of this delicious vegetable for many years.

See Related: Different Rare Flowers from Around the World

8. Kale

It’s easier to grow kale than almost any other vegetable. The Kale plant thrives in nearly all situations and conditions. This nutritious, bitter vegetable is high in antioxidant properties and is an effective anti-inflammatory agent.

Planting kale is a very easy leafy green to plant. Kale does well in partial shady spots and sandy soils. They only need adequate sunlight to germinate.

You can sow kale in a seedbed or a seeding tray. Using a seeding tray is better because it’s easier to develop. One good thing about kale is that it’s one of the toughest plants and is resistant to most diseases and pests.

Give the seedling sufficient watering immediately after planting. After every few days, use a watering can or a hose to give them a deep soaking. After 2 to 3 weeks, they will need watering less frequently. Eliminate the leaves that turn yellow.

Kale is good for succession planting for continuous harvest. You can start harvesting kale almost weeks after planting it if you prefer the baby leaves.

Kale keeps developing new and fresh leaves that you can keep picking for months. Pick the leaves near the base first and leave behind the tip to continue growing fresh leaves. And if you are new to greenhouse gardening, kale is one of the best greenhouse crops you’ll come across.

See Related: Best Greenhouse Fabrics

9. Swiss Chard

Swiss chard is one of the best leafy greens and cool-weather crops that can be grown in a greenhouse. It prefers cooler temperatures and moderate humidity, so it’s perfect for growing in a controlled environment.

There are wide varieties of Swiss chard, so you can choose the ones that best suit your taste. Swiss chard is a nutritious vegetable high in vitamins A, C, and K. It is also a good source of fiber, iron, and magnesium. Swiss chard is a versatile vegetable used in many different recipes. 

10. Escarole

Escarole is a leafy green vegetable ideal for growing in a greenhouse. It is a versatile vegetable used in salads, soups, or as a side dish.

Escarole is best suited for cooler temperatures and does not tolerate heat well. Escarole is one of the best vegetables to grow in a greenhouse because it can be harvested all year round if you practice succession planting.

See Related: Best Greenhouse Plastic Sheets for Protection

11. Zucchini or Courgettes

Zucchini (aka courgettes) is a great vegetable to grow in a greenhouse. It is a warm-season crop that loves the heat, and it grows best when the temperatures are above 70 degrees Fahrenheit.

Greenhouses provide the best environment for growing zucchini because they are warm and humid. This helps to keep the plants healthy and produce fruit all season long.

There are several varieties of zucchini you can plant, including:

• Heirloom
• Scallop
• Pattypan
• Crookneck

Zucchini can be planted directly in the ground or containers and mature within 45 to 55 days. Ensure to provide plenty of light. These fruits need full sun and well-drained soil to thrive. Amend your soil with compost or manure before planting, and water zucchini plants regularly.

See Related: Different Types of Bamboo

12. Microgreens

Microgreens (aka vegetable confetti,) combine edible young leafy greens. Microgreens love being exposed to sunlight and cannot withstand freezing temperatures.

Microgreen Mixes Include:

• Micro mix (Red Cabbage, Endive, Amaranth, Broccoli, Arugula)
• Asian mix (Hong Vit, China Ros, Tokyo Bekana, Pac Choi)
• Spring pea mix (Pea Shoots, Radish, Endive)

Maintain excellent ventilation as well as enough moisture to grow fresh greens. You may consider using heaters or heating pads to protect them from frost in winter. Ensure a sufficient set of seeds in seed trays as they need to grow in dense to hold each other.

At first, it’s okay to water them from above to soak them in the soil. But as the plant sprout, it’s advisable to do bottom watering. It helps limit the formation of gray mold and diseases.

Harvesting of microgreens should be done with a pair of scissors. And these leafy greens are usually ready for harvesting in less than a month when they reach at least two inches high.

See Related: Best Solar Panels for Greenhouse

13. Snow Peas

Snow peas are a type of pea that can be easily grown in a greenhouse. They are best planted in early spring and will produce pods that can be eaten fresh or cooked. Snow peas are high in fiber and vitamin C and taste great in salads or stir-fries.

If you want to grow snow peas in your greenhouse, here are some tips to help you get started:

• Choose a sunny spot in your greenhouse to plant your snow peas
• Soil should be rich and well-drained
• Sow the seeds 1 inch deep and spaced 2 inches apart
• Water regularly and keep the soil moist, but not wet
• Harvest the pods when they are young and tender

14. Okra

Okra, or ladyfingers, is another great vegetable grown in a greenhouse. They are excellent enhancements to soups, curries, and casseroles.

Okra plants grow best in a greenhouse because they need plenty of humidity and warm weather to thrive. Greenhouses can provide these conditions better than outdoor gardens.

See Related: Best Greenhouses for Cold Climates

15. Cucumbers

Cucumbers are another popular fruit to grow in a greenhouse. They’re easy to care for and thrive in warm, humid conditions. Cucumbers can be grown on the ground or on trellises, so they’re perfect for small spaces.

There are several varieties of cucumbers, including:

• Armenian
• Burpless
• Bush Champion
• Crystal Apple White Spine
• English
• Muncher

If you’re growing cucumbers in a greenhouse, keeping an eye on the temperature and humidity levels is important. If the air is too dry, the cucumbers will dehydrate, and the skin will blister. 

16. Peppers

Pepper plants are versatile fruits that can be used in many different dishes. They like warm temperatures and sunlight, so they’re ideal for growing in a greenhouse. There are wide varieties of peppers like sweet bells and jalapenos, so you can choose the ones that best suit your taste.

Peppers can be used fresh in salads or cooked in stir-fries, soups, and stews. Peppers can also be pickled and canned for long-term storage or stuffed with yummy fillings.

When choosing peppers for your greenhouse, consider the different varieties and determine which ones best suit your needs. 

17. Lettuce

Lettuce is a cool-weather crop that can be grown in a greenhouse, and it is one of the best leafy greens to grow in a greenhouse. It prefers cooler temperatures and moderate humidity, so it’s perfect for growing in a controlled environment.

There are wide different varieties of lettuce, so you can choose the ones that best suit your taste, including:

• Iceberg lettuce
• Batavia lettuce
• Butterhead lettuce
• Romaine lettuce
• Celtuce

Lettuce is a cool-weather crop that can be grown in a greenhouse year-round. If you live in an area with a cold climate, you can grow lettuce in a greenhouse to get fresh, healthy greens even in the middle of winter.

Lettuce is easy to care for and doesn’t require much attention. Just keep an eye on your greenhouse’s temperature and humidity levels to ensure that your lettuce plants are happy and healthy.

18. Arugula

Arugula is a leafy green vegetable that is often used in salads. Arugula is one of the best salad greens to grow in a greenhouse. It has a slightly peppery flavor and is very easy to grow.

Arugula can be sown directly in the ground or started planting healthy plants indoors and then transplanted into the greenhouse.

Arugula is a hardy plant and can tolerate some cold, so it is a good choice for cooler climates. Arugula is relatively pest and disease-free, making it easy to grow organically. Arugula is also quick to mature, so it can be harvested just a few weeks after planting.

19. Green or Red Chili

Greenhouses allow chili peppers to be grown in a controlled environment, which helps to ensure that they stay fresh and vibrant.

As a result, greenhouse-grown chilies are usually of higher quality than those grown outdoors. Whether you prefer green or red chilies, you can be sure they will add flavor and spice to your next meal.

See Related: How to Utilize Greenhouse Bees for Pollination

Benefits of Growing Vegetables in a Greenhouse

When it comes to gardening, there are a lot of different ways to go about it. You can grow vegetables in your backyard or opt for something a little more high-tech and grow them in a greenhouse.

Greenhouses have several benefits that make them the best option for growing vegetables. Here are some of the benefits you need to know.

You can extend growing seasons

A greenhouse can be a great way to extend your growing season. Growing vegetables in a greenhouse allow you to enjoy fresh produce well before the temperature outside starts to warm up.

And by using a greenhouse, you can protect your plants from cold weather and pests and get a quality harvest year-round.

You can grow a wider variety of vegetables

When gardening, many people stick with the basics: plants like tomatoes, peppers, squashes, and cucumbers.

But did you know that you can grow a far wider variety of vegetables in a greenhouse?

Using the right techniques, you can create a bountiful garden that will provide fresh vegetables all season long.

You can create a sheltered environment for your plants

A greenhouse is a great way to create a sheltered greenhouse environment to grow plants. Using a greenhouse, you can extend the planting season for your vegetables, which means you can enjoy fresh vegetables all year round.

Additionally, a greenhouse can help protect your plants from diseases and have fewer pest problems, which can be especially helpful if you are growing sensitive crops.

You can make a profit!

Greenhouses provide the perfect environment for growing vegetables. Not only does it allow you to extend your growing season, but it can also be a profitable endeavor.

By growing a variety of vegetables in your greenhouse, you can produce an abundance of fresh produce that can be sold at local farmers’ markets or roadside stands. It can provide nice supplemental income money, and enjoy delicious, fresh vegetables all year by growing your own in a greenhouse!

You’ll save money on groceries!

One of the best benefits of growing vegetables in a greenhouse is saving money on groceries. By growing your vegetables and warm-season vegetables, you can reduce your grocery bill quite a bit. It is because you will have a fresh, homegrown supply of vegetables and many plants all season long.

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