Grow Cucumbers in a Greenhouse

How to Grow Cucumbers in a Greenhouse?

Do you want to know how to grow cucumbers in a greenhouse? Growing cucumbers in a greenhouse is rewarding and easy.

With proper techniques like irrigation, training, and pest control, anyone can enjoy a steady supply of delicious cucumbers year-round.

Understand the fundamentals, from planting to harvesting, to ensure healthy plants and abundant harvests. So, dive in and enjoy growing your own cucumbers!


Two Basic Categories of Cucumber

In greenhouse vegetable production, cucumbers are a popular crop. Two main varieties, English and Beit Alpha, are commonly grown.

These cucumbers are parthenocarpic and do not require pollination to produce fruit. As a result, Cucumbers are sold as seedless because the fruit develops without fertilization, resulting in no seeds.

Cucumbers that grow Outdoors or on Ridges

The cucumbers grown outdoors typically have shorter, thicker shapes and uneven skin.

Nevertheless, these plants produce both male and female flowers, needing pollination for fruit development. Thankfully, insects usually handle pollination.

Additional Information how to Grow Cucumbers in a Greenhouse

Cucumbers are typically bisexual and homothallic. So, they have both male and female flowers on the same plant.

To successfully grow cucumbers in a greenhouse, it is essential to understand how to differentiate between male and female flowers.

Male flowers are smaller and have a slender stem, while female flowers have a swollen base resembling a miniature cucumber.

This basic knowledge is crucial for proper pollination and maximizing fruit production in greenhouse cultivation.

Male flowers have simple stems, while female flowers have a small cucumber-like structure at the base, indicating an immature fruit.

Cucumbers, a common vegetable in the gourd family, grow on creeping vines and are packed with Vitamin K, flavonoids, and potassium.

Despite being technically fruits, cucumbers thrive in greenhouses. Here is how to grow them:

Methods how to grow cucumbers in a greenhouse

How to Grow Cucumbers in a Greenhouse
  • To transplant cucumber seeds safely, sow them three weeks before the expected frost ends.
  • Protect them from frost damage with greenhouse heaters during winter months, enabling year-round cultivation without worrying about frost dates.
  • Cucumbers thrive in containers too. Plant one seed per three-inch container for optimal space during early growth.
  • To avoid disturbing the roots, sow seeds in peat pots or small flowerpots that can be transplanted without removing the plant.
  • Allocate a greenhouse area for seedlings to be moved three weeks after starting seeds. Alternatively, use hanging pots or growth bags for transplantation.
  • When replanting in raised beds or on the ground in the greenhouse, maintain a spacing of 12 to 15 inches between cucumber plants.

Utilize your Available Vertical Space

Using a trellis boosts cucumber growth, resulting in larger fruits by stimulating more side shoots.

Train the main branches upward along the trellis, pruning the top when they reach its edge. As side shoots develop, trim the ends, leaving two leaves per fruit for optimal harvests.

Five fantastic greenhouse add-ons for your cucumbers

  • Enhance your crop’s success with a strong start. Plant cucumbers in the RSI Hydroponic Floating Seeding Tray to shield delicate roots and ensure optimal growth for your valuable crops.
  • Elevate your cucumber growth in the greenhouse with Juliana Flexible Plant Spirals.

These adjustable spirals provide vertical support, allowing your cucumbers to flourish while staying confined within the greenhouse.

With a height of up to six feet, create stunning arrangements for your cucumber plants with ease.

  • Suitable for self-watering pots to prevent plant wilting and save time on watering. With the Calypso Planter with Trellis and Reservoir, your climbing cucumber plants will thrive while conserving space in your garden.
  • Consider the Eden Garden Bed with Trellis for your garden needs. This raised bed with a built-in trellis is perfect for growing cucumbers and other plants that require support. It’s an ideal choice for both convenience and plant health.
  • Add personality to your garden with the Wood Trellis Screen and Planter System. Customize the trellis to suit your preferences and place it wherever your cucumbers need support. It’s a versatile and stylish addition to any garden space.

Two Methods of Cucumber Training

When using the triple stem training method for vines:

  • Remove all extra sprouts along the vine.
  • Pinch off the top buds, leaving three main sprouts.
  • Let these three grow on their own towards the trellis tip.

For lateral growth training:

  • Remove all suckers for the first four to five fruit sets.
  • Allow one leaf and one blossom on the next eight to ten suckers.
  • Squeeze the tip of each sucker after this stage.
  • Over eight to ten growth cycles, each remaining sucker should develop two leaves and blooms.
  • Trim the last remaining growth.
  • The trellis bar should be around six feet high.

Management of pests

  • Watch out for cucumber beetles and whiteflies, common cucumber pests.
  • Be wary of anthracnose, mosaic virus, and bacterial wilt, which can harm cucumber plants.
  • Look for underdeveloped or yellowing leaves, indicating nutritional deficiencies.
  • In spring and summer, greenhouse whiteflies can be troublesome.
  • Adults are visible, but you might need a lens to spot immature larvae.
  • Use biological control methods or yellow sticky traps for effective pest management.

Enough Irrigation

  • Water cucumbers moderately.
  • Give each plant about one gallon of water per week after they emerge.
  • Alternatively, follow the “little and often” principle.
  • Utilize greenhouse watering systems to manage the amount and timing of irrigation effectively.

Suitable Soil Conditions

  • Aim for neutral to slightly alkaline soils with a pH of 6.0 to 7.0.
  • Cucumbers can tolerate pH values up to 7.6.
  • When fruits start growing, apply a mild liquid fertilizer every two months for best results.

Ensure the ideal amount of warmth and light

  • Maintain bottom heat of around 70°F in the sprouting medium.
  • Use a soil thermometer in the planting area to ensure soil temperature stays above 60°F, as colder temperatures halt growth and reduce plant health.
  • Position your greenhouse kit to receive at least six hours of direct sunlight daily for ample sunshine.
  • Keep the inside of the greenhouse warm and moist by frequent spraying.
  • Consider shading your plants on extremely hot days to protect them. Shade Cloths can help regulate greenhouse temperature.

The most thrilling aspect of it all! Harvesting

  • Each plant yields 20 to 50 cucumbers.
  • Harvest when they reach six to eight inches in length, typically around twelve weeks after planting.
  • It’s best to pick them while still young to avoid bitterness from seed production.
  • Regular harvesting ensures a continuous supply.
  • Use a sharp knife to cut the ripe fruits at the base.
  • Early morning harvests are recommended while it’s still cool.
  • If stored properly, cucumber seeds can last three years or more.

FAQs(Frequently Asked Questions)

Can you grow cucumbers in a greenhouse?

For greenhouse vegetable production, cucumbers are a popular choice.

Two main varieties used are English and Beit Alpha. These cucumbers are parthenocarpic, which can produce fruit without needing pollination or flower fertilization.

How long does it take to grow a cucumber?

After planting, cucumbers can be harvested in 50–70 days, depending on the variety. Harvest based on intended usage and size preference. Young cucumbers have the best flavor. Avoid letting cucumbers grow too large and bitter, and prevent them from turning yellow.


How to grow Cucumbers in a Greenhouse? So, growing cucumbers in a greenhouse offers a rewarding experience with abundant harvests and delicious fruits.

However, by understanding the fundamentals of cucumber cultivation in a greenhouse, from planting to harvesting, enthusiasts can optimize their yields and enjoy fresh cucumbers year-round.

Utilizing techniques such as proper irrigation, training methods, pest management, and maintaining optimal greenhouse conditions ensures healthy plants and bountiful harvests.

With the right knowledge and care, anyone can successfully grow cucumbers in their greenhouse, providing a continuous supply of nutritious and flavorful produce.

So, roll up your sleeves, get your hands dirty, and enjoy the satisfaction of growing your own cucumbers in your greenhouse!

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