Updated at: 29-05-2022 - By: Sienna Lewis

Summertime is ideal for growing and harvesting cucumbers. In this article, we’ll cover how to produce cucumbers in a greenhouse. Read on to learn more.

Cucumbers, like other fruits and vegetables, taste tastier, sweeter, and fresher if you cultivate them yourself. It’s more rewarding, too. You’ll be able to grow a variety of cucumbers in a little greenhouse.

How Can You Grow Cucumbers in a Greenhouse?

Cucumbers can be grown in a greenhouse in a matter of days, rather than weeks. This is how you do it:


Using organic compost, plant two cucumber seeds in each little container. To germinate more quickly, the seeds need to be heated, as cucumbers do best in warmer regions. Within 7 to 10 days of planting, the seeds should begin to sprout.

How to Grow Cucumbers in Containers and Pots in the Garden - Dengarden


Cucumbers, as previously said, thrive at high temperatures and high humidity. As a rule of thumb, cucumbers should be grown in a greenhouse if they are to thrive in colder climates or if they are to be grown year-round.

When the seedlings have two to three leaves, transplant them outside. They should be watered frequently, and the soil should be kept moist and clear of weeds. If you’re growing them in a greenhouse, spraying your cucumber plants with water while they’re wrapped in bubble wrap will help them retain heat.

Bamboo canes or nets can be used to support the stems of your plants as they mature. They should be watered and fed as soon as they begin to blossom.

What Can You Plant Next to Cucumbers?

To top it all off, cucumbers are quick and easy to grow, taking only 50 to 70 days from seed to harvest. Many gardeners choose them because of this. However, it is essential to keep them disease-free. Powdery mildew, bacterial wilt, mosaic virus, and other unpleasant pests will attack them if they don’t.

These issues can be avoided with companion planting. Cauliflower, broccoli, cabbage, corn, peas, lettuce, legume beans and radishes can all be planted near your cucumbers. You can also grow marigolds and oregano in the vicinity of your cucumbers as well.

Aphids, beetles, ants, and more can be deterred by these plants. Healthy soil, increased growth, and better-tasting produce are all benefits of companion plants.

Cucumbers do well with companion plants, but there are a few you should avoid growing near your cucumbers. Cucumbers do not go well with melons, potatoes, or sage.

In addition to competing for nutrients and water, potatoes attract pests that could hurt your plants, whereas sage serves as a natural deterrent. Cucumbers, on the other hand, will have to contend with ground vines.

Is Buying a Mini Greenhouse a Good Idea?

Gardeners, especially those new to greenhouse gardening, should invest in a small greenhouse. Buying a little greenhouse is a terrific choice for a number of reasons, including the following:

Different sizes to choose from

You may not know this, but greenhouses aren’t actually very huge or spacious. For the most part, they come in all different forms and sizes. Because of their compact size, mini greenhouses are the most convenient. You’re better off with a smaller greenhouse unless you plan to sell it.

Keep your plants safe from animals and pests

Caterpillars, aphids, raccoons, and other creatures enjoy to feast on your leaves and produce. Insects and animals can’t get to your plants if you keep them in a greenhouse. They’ll be safe from illness, too, as surrounding plants can’t spread it to them.

Protect plants from harsh weather conditions

Plants, especially those that are more vulnerable, can be harmed by heavy rain, high winds, and severe heat. Your plants will be well protected from the elements if you invest in a small greenhouse. It doesn’t matter what the weather is like outside.

Best for gardeners with limited space

But what if you don’t have enough land to start a garden of your own? Gardeners with limited room can benefit from a tiny greenhouse. A six-foot-long mini-greenhouse is the most common size, but there are smaller options for individuals who want a smaller footprint. Mini-greenhouses may be smaller, yet they provide the same functions as larger greenhouses.

Great for beginners

Mini-greenhouses are a great way to learn about greenhouse gardening without having to make a significant financial commitment. To get a sense of how a greenhouse works and what the optimal conditions are for your plants, you can experiment with a temporary one.

Extend growing season

You can start planting in a little greenhouse even before the cold season begins. Plants can be grown whenever you like. Transplanting your greenhouse’s plants into your garden will be possible as the weather warms up. Planting more crops and harvesting them earlier will be possible as a result.

Two main varieties of cucumber

Long, juicy cucumbers are produced by the greenhouse cucumber variety, just like the ones you buy at the store. Pollination isn’t necessary. You must remove all male blooms to prevent pollination from taking place, or the result will be bitter.

In contrast, the smaller, fatter, and more unevenly skinned outdoor or ridge cucumber varieties. Because they produce both male and female flowers, they must be pollinated. For your benefit, insects will most likely take care of this for you.

Can I grow cucumber from seed?

The answer is yes, you can grow cucumbers from seed, but you need to know when to do so.

Whether you’re growing cucumbers in a heated or unheated greenhouse, or if you’re doing your planting outside, will determine when you should start your cucumber seeds. If your greenhouse is heated, you can begin planting as early as February. Do your outside seedlings not go in the ground until May. In mid- or early April, if you have an unheated propagator, you should be able to plant.

7.5cm free-draining pots are ideal for starting cucumber seeds. At a depth of one centimeter, the seeds should be sown. Temperatures of 20 degrees Celsius should be maintained for 7 to 10 days after planting the seedlings. You can use a propagator or a plastic bag to keep your pots moist.

To keep your cucumber seeds warm after they’ve sprouted, place them on a windowsill in an area that gets a lot of sunlight. Keep your plants at a temperature of 15°C or higher to prevent them from freezing. Monitor the amount of water your cucumber plants receive; the compost should be moist but not soaked through to the point of saturation. Water sparingly but frequently. You should keep an eye out for burned cucumber seedlings if the sun is strong and direct. Because the roots of such small plants are delicate, care must be taken when transplanting them.

Growing Cucumbers Outdoors

If you’re going to plant outdoor cucumbers (ridge cucumbers), you should acclimatize them to the soil over a period of 7–10 days rather than planting them directly into the ground. To begin, only let them out for 3-4 hours at a time, then bring them in at night to rest. Over the course of 7 to 10 days, gradually increase the amount of time you leave them outside.

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Ideally, cucumbers should be grown in a sunny, wind-protected location.

There is no need to urge cucumbers in the garden to climb like you would in a greenhouse. While allowing them to spread out, give them plenty of room. Cucumbers should be spaced around 90cm apart when grown outside.

As soon as seven leaves appear, pinch out the top of your outdoor cucumbers to prevent them from wilting. This will result in a larger harvest.

Cucumbers grown in a greenhouse should not be pollinated, whereas cucumbers grown outside should. For outdoor cucumbers, pollination by insects is critical, therefore leave both the male and female flowers alone.

Which Varieties of Cucumbers Can Be Grown Indoors and Outdoors?

It is possible to cultivate some cucumbers either in a greenhouse or outdoors. All-female “Swing” F1 Hybrid (a longer cucumber) and The “Diva” are two examples (a seedless mini cucumber).

It’s critical to know what kinds of cucumbers are being grown in the same area. To avoid cross-pollination, avoid planting outdoor cucumbers with all-female varieties next to each other.

Let’s talk more about growing cucumbers

It is common for cucumbers to be monoecious. Each plant has a blossom that is both male and female. Grow cucumbers in a greenhouse and learn how to tell male and female blossoms apart:

Male blooms are easily identified by their simple stems. It seems like a cucumber or a sprout of fruit is developing between the base of the bloom and the stem of a female flower.

Cucumber is a gourd-family vegetable that is commonly grown. There are cucumiform fruits on this vine that crawl along the ground. Flavonoids and Vitamin K are abundant in cucumbers, which are high in potassium and flavonoids. Cucumbers, which are technically fruits, may be grown in a greenhouse and are easy to harvest. To do this, follow these steps:

Steps on how to grow cucumbers in a greenhouse

  • Plan on transplanting your cucumber seeds one week after frost has passed by sowing them in the final three weeks before the date of your last expected frost date of the year. To protect cucumbers from frost damage, this is essential. During the coldest months, you’ll want to utilize a greenhouse heater to keep your cucumbers warm. To avoid having to worry about frost dates, you can grow them all year round.
  • Cucumbers do well in containers as well. One seed should be sown in a 3-inch container. This allows them enough room for the earliest stages of plant development.
  • To avoid disturbing the roots, plant them in peat pots or small peat flowerpots that may be elevated and relocated without the need to remove the plants.
  • Prepare a patch in your greenhouse three weeks after starting the seeds so that you may transplant the seedlings there.
  • Seedlings can also be grown in hanging pots or in growth bags if you choose.
  • If you’re putting them on raised beds or the ground of a greenhouse, you should space them 12 to 15 inches apart.

Take advantage of your vertical space

Cucumbers grown on a trellis produce more side shoots and larger cucumbers as a result. Cucumbers should be backed up so that they can rise and produce high yields. A trellis can help direct the growth of the main stems. The developing portion at the top of the trellis should be removed when they reach the outside edge of the structure. When the side shoots start to expand, cut off the ends of each one, so that each fruit has two leaves.

5 great greenhouse accessories for your cucumbers

Starting from the beginning will help you increase your harvest. The RSI Hydroponic Floating Seeding Tray does not harm the delicate roots of your precious cucumber plants when you start them there.

Using Juliana Flexible Plant Spirals, you can keep your cucumbers in your greenhouse while allowing them to grow vertically. Arrange cucumber plants in a pleasing manner. It can be adjusted to accommodate people of varying heights and sizes up to a maximum of six feet.

Keep your plants alive by using self-watering planters. Take on more gardening tasks and water your plants less frequently. Climbing cucumber plants look great in the Calypso Planter with Trellis and Reservoir, and it can also save you some valuable floor space.

Consider a raised trellis for your garden. Garden beds like the Eden Garden Bed with Trellis are ideal for transplanting cucumbers and other vegetables into the garden.

Customize your outdoor space with the Wooden Trellis Screen and Planter System. With the trellis, you have the freedom to arrange it in any way you see fit. The location where you put this will depend on the needs of your cucumber.

Training your cucumbers in two ways

You can use the triple stem training method if you want to remove all the suckers or root sprouts from your trellis. In order to encourage new growth, leave three suckers to sprout from the main stem just above the trellis’ final blooms.

Latitudinal growth training is the next method, which involves removing all suckers for the first four to five fruit sets. For the remaining eight to ten suckers, one leaf and one bloom must be produced. Squeeze the sucker’s tip to complete the process. The remaining suckers must produce two leaves and two blossoms for each of the remaining eight to ten suckers. Snip the remaining stems in half. The height of the trellis bar should be around six feet.

Pests control

Whiteflies and cucumber beetles are two of the most frequent cucumber pests. If the plant is infected with bacteria wilt or the mosaic virus, it will die out. Yellow foliage, undeveloped fruit, and other telltale signs of malnutrition can be found.

In the spring and summer, greenhouse whiteflies can be a problem. Adults are easy to spot, but finding larvae in their early stages necessitates using a microscope. This can be greatly aided by the use of yellow sticky traps and biological control.

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Proper watering

There is no need to overwater cucumbers. After the plants have emerged, a gallon of water per week is the recommended amount of water per plant. Use the “small and frequently” approach instead. These Greenhouse Watering Systems allow you to plan and control your watering schedule and volume.

Good soil conditions

Cucumbers flourish in soils with a pH between 6.0 and 7.0, which are neutral to slightly alkaline. Even soils with pH levels as high as 7.6 can be tolerated by plants. Once the fruit begins to grow, a monthly application of a mild liquid fertilizer will be good.

Prep for a perfect light and warmth

As a general rule, the bottom temperature of the sprouting media should be 70°F. Determine where cucumbers will be planted by using a soil thermometer. Soil temperatures below 60 degrees Fahrenheit halt growth and deteriorate health. Freezing temperatures will kill it.

In order to grow cucumbers, you must guarantee that your greenhouse kit permits at least six hours of direct sunlight per day. Mist the interior on a frequent basis to keep it warm and moist. To protect your plants from the blazing heat, you may need to enclose them in a protective screen. Alternatively, a smattering of color is preferable. Cool down your greenhouse with these Shade Cloths.

The exciting part of all! Harvesting!

Each cucumber plant can produce between 20 and 50 cucumbers. When the cucumbers are between six and eight inches long, you can begin harvesting them. However, the optimal time to harvest them is when they are still young, especially before showing signs of seed production. A fruit’s flavor might change as it ages. Repeated harvesting will ensure an inexhaustible supply of food. Use a sharp knife to chop off the ready-to-eat fruits at the root. While the weather is still chilly, an early-morning harvest is advised. If kept in a cool, dry place, the seeds can be used for up to three years.

Common Problems

Keep an eye out for a mosaic pattern of yellow on your plants. Your plants have been infected with the cucumber mosaic virus, as evidenced by this characteristic pattern (a virus spread easily by aphids). If you don’t remove the affected plants as soon as possible, the illness will swiftly spread to your other plants.

It’s possible that powdery mildew is present if you see white spots and little shriveled leaves on your plants. Your crops will become unusable if they are infected with powdery mildew. Powdery mildew may be prevented by providing your plants with adequate hydration.

Whiteflies are tiny, white pests that wreak havoc on plant life. Your plants will become unwell as a result of the growth of black mould caused by them. Whitefly can be fought with yellow sticky traps and regular soap-based spraying of the underside of the leaves.

The red spider mite can destroy your greenhouse cucumbers by covering them in a fine web. Use a biological control or burn any reddish or rusty foliage to combat the Red spider mite.

Find out how to keep slugs and snails away from your cucumber plants by clicking on the links below.