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Greenhouse Gardening – How to Grow Peppers?

Greenhouse Gardening - How to Grow Peppers?

Table of Contents

With plenty of space, a decent supply of daylight, an adequate amount of fertilizer, mulch covering, and regular water supply, your peppers will develop healthily and generously. Grow peppers in a greenhouse and enjoy this colorful crop together with a combination of different shapes and sizes. It will absolutely satisfy everyone’s taste from mild to spicy hot.

Pepper varieties to choose from

Peppers or capsicum is a flowering plant belonging to the nightshade family. It is native to the Americas though it now is cultivated all over the world and used in many cuisines. This tender, warm-season crop is a great source of vitamins A, B2, B6, C, and E as well as dietary fiber and molybdenum.

Bell Pepper

These typical sweet bell pepper varieties are available in many colors. The green peppers are actually under-ripe fruits, which will become yellow or red as they ripen. It is great for salads and roasted in cuts or spread over your pizza.


Cayenne in a basket

Cayenne is long, thin and filled with a spicy punch. These brilliant red chili peppers can be eaten raw, dried or powdered. Imagine the on-the-spot fire in the form of cayenne with its mouth stinging character. It is also an attractive plant to include in your garden design.


Savor the green or red jalapeno packed with cream cheese for a spicy yet creamy feast. These are the perfect bite with a cold beer. You can turn down the spiciness by extracting the seeds and around the white layer before filling.

Still, wondering how to grow peppers in a greenhouse? It’s right here. Just follow the easy steps below.

Growing peppers from seeds

  • Plant your pepper seeds about half an inch deep in your containers. Check out Planters, Pots & Benches collections for better results!
  • If you are preparing to transplant them to bigger pots, give every seed at least one square inch of space in a seed tray. Improve your harvest by using RSI Hydroponic Floating Seeding Tray!
  • The preferred spacing is 18 inches apart.
  • Wrap them with transparent plastic cover.
  • Peppers do well in deep soil with plenty of organic matter and adequate supply of calcium and phosphorus.
  • Pepper seeds will sprout in eight days to three weeks, depending on its soil temperature.
  • Hot pepper seeds are normally slower to germinate than sweet pepper varieties.
  • Once the seedlings start to appear, lift the plastic and arrange them in your greenhouse with brilliant sun.
  • Once you see their initial set of true leaves, it is time to feed them once or twice a week.
  • This is also the best time to thin your seedlings or transplant one inch spaced into bigger containers.


The spiciest types of peppers require a long maturing period. But you can speed things up at the beginning of the season by soaking the seeds for approximately ten minutes before planting. It softens the seed cover and improves germination time.

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Paprika or pepper plant with the text: How to grow peppers in a greenhouse

Diseases and pests to watch out for with pepper plants

Going after snails and slugs and the disposing of them can be an extremely satisfying exercise especially if those small pests have already discovered your peppers.

A powerful water hose will shortly remove aphids and other pests from adult plants. Be mindful not to soak or harm your peppers. This is not advisable for young seedlings. Crop rotation is also a really smart tactic in order to avoid these pests.

Flea beetles feast on the underneath fresh leaves. They leave tiny pits. Larvae survive originally in the soil and roots. It creates small damage. Ensure speedy germination and growth of your seedlings so that they thrive through this vulnerable stage immediately. Flea beetles appear in the middle of the day, and they do not wish to get wet. Giving them a noontime drizzle can overcome the obstacle.

Watering demands

Peppers require a lot of water. Keeping the soil constantly wet will suffice but when temperatures rise then you may need to water daily to help the plants cope with the heat. Ideally, apply at least an inch of water every four days. Just water the plants adequately all through their lifespan. Install watering systems only when needed.

Best soil conditions to grow pepper in a greenhouse

Peppers grow well in nutrient-rich soil with adequate calcium and phosphorus. The ideal soil pH should be between 6.0 and 7.0. The optimal soil temperature for efficient germination is 70°F or slightly more to break dormancy. You can put heat mats beneath the containers to aim at the right soil temperature. Apply foliar feed when the plants start to bloom and again every ten days. In addition, apply fertilizer soon after the first fruit emerges. This will ensure you get larger fruits but remember that excessive fertilizer limits their ability to produce fruit.

Lighting and temperature

Peppers require consistent light with proper temperature control. Choose a spot in your greenhouse that gets at least six hours of direct sunlight every day.

The seedlings will thrive fully with a daytime temperature of 65°F to 70°F and 60°F to 65°F in the evening. Do your best to keep these temperatures in your greenhouse.

Harvesting grown peppers

Freshly harvested peppers

Harvesting sweet peppers expect some composure because the fragile parts will break if you pull them. Scissors, sharp blade or hand pruners are recommended. Use gloves or clean your hands quickly when harvesting hot peppers. Never rub your eyes or face to prevent the burning sensation. Growing peppers in a greenhouse are achievable. So, choose a variety and start today to enjoy your future harvest.

Which variety of peppers do you wish to grow? Let us know by leaving a comment below!


  1. Thanks for the information. I am growing pepper seeds from store bought peppers. I harvested the seeds of red, green, yellow bell peppers together. I didn’t separate them. You stated when to remove the plastic, which is the information I needed. However, I do not have a green house. The young plants are in red party cups. According to your article, I need to replant in larger pots now for growing space.

    1. Greenhouse Emporium

      Thanks for sharing your experience! We hope you’ll enjoy your delicious homegrown bell peppers.

    2. Hey there, just to remind you that seeds saved from a grocery store variety will not necessarily come out like the parent plants if they were F1 hybrids as the genetics are not stable and the plant may revert back to one of the parent types. No matter what, it will be edible though. Also most peppers start green and then mature to red so be prepared for that as well.

  2. José Torres

    Hello, I have a relatively big DIY greenhouse, i have planted many crops in here (tomato, peas, lettuce, cucumbers, carrots and sweet peppers) but my peppers always put the flowers and die. This is the 2nd year and I have got veggies from all appart from pepeprs.
    I have a watering system and plants get water 2 or 3 times a week.
    Is there any special procedure for peppers?
    Thank you in advance.

    1. Greenhouse Emporium

      Sorry to hear that, José. What’s the temperature in your greenhouse (day and night)? Do you have bees or other pollinating insects that travel into your greenhouse? If not, you should try manual pollination. Another reason could be the soil and fertilizer. Either lacking calcium or over-fertilizing can be a reason too. I hope this helps you a bit. I think I will edit the post soon and add some more tips for this issue.

    2. We started our Shepherd and bell peppers from seeds of peppers bought at the farmer’s market last summer. They were planted in the greenhouse and grew nicely through the winter at about 20 degrees Celsius. We do not get much sunlight in Toronto November thru January , but in February the sun begins to be more frequent. Additionally, the greenhouse has thermal plastic roof and side panels, a heater and fan for air exchange, and a few grow lights. It has soil-filled beds about 2 ft deep, not pots. The peppers picked up beautifully in the spring and we have been getting really nice red, elongated shepherd peppers as well as green bell peppers for the past two summer months. They are big plants and are producing many fruit. I’m wondering if they will continue to thrive or produce any fruit as fall and winter approaches, now that they have established themselves?

      1. Greenhouse Emporium Team

        Hi Nina! Sounds like you’re doing a great job gardening even with limited sunlight during the winter months. Peppers usually require a dormant period to rest and rejuvenate. So it is unlikely you will see continued fruit and flowers as the plants adjust to dwindling sunlight. However, if you can give them enough heat and light, they may continue to grow flowers/fruits. This means as long as your heater and grow lights create the right growing conditions, you should be good to go.

  3. I have a couple of plants in my greenhouse and one of them has peppers that are real small and already ripening. What causes this?

    1. Greenhouse Emporium

      Hi Dave, I assume you got the temperature right and it hasn’t dropped under 50F. How is the rest of the plant looking? Is it looking healthy or sad? There might be a problem with nutrients (lack of phosphorus), watering, or the pollination wasn’t good enough.

  4. Marion Kleber

    I have a small outdoor greenhouse with several bell peppers plants. I also want to use a grow light. How many hours do I need to keep the light turned on? I live in southwest New Mexico where it is hot and dry. Thanks!

    1. Greenhouse Emporium

      Hi Marion, bell peppers should get at least 6 hours of light. Just before you get a grow light, don’t you think you will still get enough sunlight? I would think New Mexico still gets 6-8 hours a day in winter. Grow lights are usually when you cannot give the plants enough sunlight (Northern states or indoor growing).

  5. angela conifer

    My chili peppers have flowers and are doing okay in the greenhouse. The sweet peppers on the other hand have grown flowers that have died and gone hard. What am I doing wrong ?
    I have put them outside in the hope that they might be revived and they might not like the greenhouse conditions.

    1. Greenhouse Emporium Team

      Hi Angela, a number of factors could cause this, including temperature, lack of pollination, and level of fertilization. Also, do you have enough hours of light in your greenhouse? You may want to consider adding a fan to encourage pollination. Also inspect your plants to make sure no unwanted pests are creating problems. It’s difficult to say for certain as this could be caused by many things. We hope it works out!

  6. Zone 7b. Is it an option to pull pepper plants out of garden and put in greenhouse to overwinter? Not necessarily to grow, just to keep them alive until next planting. Is it necessary to have the greenhouse heated? Thanks!

    1. Greenhouse Emporium Team

      Hi Sonja! Some gardeners have had great success overwintering peppers in zone 7b. You will need to ensure the temperatures in the greenhouse stay above a minimum of 40° F to prevent die off from cold. Depending on your setup, you may need a heater or passive heating system to maintain temperatures above freezing. About one month before warmer weather returns and before the last frost, you will want to gradually move the plants to a warmer, sunnier location so they transition well back into your garden. Enjoy your peppers!

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