Best Cucumber Varieties to Grow in Greenhouses in Winter

Best Cucumber Varieties to Grow in Greenhouses in Winter

Growing cucumbers in a greenhouse during winter allows gardeners to enjoy crisp, refreshing cucumbers even when outdoor temperatures dip too low for normal growth. However, not all cucumber varieties perform well in protected, low-light, cooler winter conditions. Selecting the right winter-adapted cucumber variety is key to success. In this guide, we’ll explore the best cucumber varieties for winter greenhouse growing, what to look for in a winter-suited cucumber plant, and how to optimize conditions for a productive off-season harvest.

Why Grow Cucumbers in a Greenhouse in Winter?

Cucumbers are typically warm-season vegetables, thriving in temperatures between 70–85°F (21–29°C). While outdoor winter growing is impossible in most regions, greenhouses create a microclimate that extends the growing season. With a greenhouse, even unheated, you can shield cucumbers from frost, wind, and excess moisture.

Benefits include:

Off-season access to fresh cucumbers

Protection from cold weather pests

Controlled watering and humidity

Higher yields with trellised vertical growth

Year-round self-sufficiency for home gardeners

To make the most of greenhouse conditions in winter, selecting varieties bred for low light, disease resistance, and shorter days is essential.

What to Look for in a Winter Greenhouse Cucumber Variety

When choosing cucumber varieties for greenhouse winter cultivation, focus on these key traits:

1. Parthenocarpic (Self-Pollinating)

Winter conditions usually limit pollinator activity, so self-pollinating or parthenocarpic varieties that do not require bees or other insects to set fruit are ideal.

2. Short Daylight Tolerance

Winter brings shorter days and less intense sunlight. Choose varieties bred to produce fruit under low-light or short-day conditions.

3. Compact Growth Habit

Bush or compact vining types work best in confined greenhouse spaces, particularly if vertical gardening systems are in place.

4. Disease Resistance

Humidity in winter greenhouses can lead to powdery mildew and downy mildew. Varieties with built-in resistance help reduce the need for chemical control.

5. Cold Tolerance

While cucumbers are not frost-hardy, some varieties tolerate cooler nighttime temperatures better than others, making them more suitable for unheated or minimally heated greenhouses.

Top Cucumber Varieties for Winter Greenhouse Growing

1. ‘Tasty Jade’ (Hybrid)

Type: Japanese-style parthenocarpic slicer

Days to Maturity: 55–60

Highlights: Long, slender, dark green fruits with thin skin and a crisp texture.

Why it excels: Tolerates lower light, self-pollinating, and highly productive in cooler greenhouse climates. Produces uniform, slightly curved fruits ideal for fresh eating or slicing.

2. ‘Diva’ (Hybrid)

Type: Beit Alpha-style, parthenocarpic

Days to Maturity: 58

Highlights: Smooth, thin-skinned fruit, very crisp and slightly sweet.

Why it excels: Disease resistant (PM, CMV), requires no pollination, ideal for cooler climates and winter light levels.

3. ‘Emilie’ (Hybrid)

Type: Mini cucumber, parthenocarpic

Days to Maturity: 55

Highlights: Small, tender cucumbers about 4–6 inches long.

Why it excels: A Dutch-style mini that thrives in winter greenhouse conditions. High yields and excellent cold and mildew resistance.

4. ‘Tyria’ (F1 Hybrid)

Type: European slicer, parthenocarpic

Days to Maturity: 55–60

Highlights: 12–14-inch long, straight cucumbers with thin skin and no bitterness.

Why it excels: Designed for protected culture; thrives in greenhouse conditions with low light. Great disease resistance and consistent productivity.

5. ‘Socrates’ (F1 Hybrid)

Type: Beit Alpha-style, parthenocarpic

Days to Maturity: 52–56

Highlights: Short, dark green fruits with sweet flavor.

Why it excels: Especially suited to cooler conditions and short days. High-quality fruits and strong vigor, ideal for late fall and winter greenhouses.

6. ‘Baby Persian’ (Mini)

Type: Pickling/mini slicer, parthenocarpic

Days to Maturity: 50–55

Highlights: Crisp and flavorful, about 4–6 inches long.

Why it excels: High-yielding in small spaces. Strong performer even under fluorescent grow lights or low sunlight conditions in deep winter.

7. ‘Picolino’ (F1 Hybrid)

Type: Cocktail cucumber

Days to Maturity: 50

Highlights: Small, thin-skinned cucumbers with excellent eating quality.

Why it excels: Perfect for winter greenhouse or polytunnel production. Vigorous plants but compact enough for smaller structures.

Growing Tips for Winter Greenhouse Cucumbers

1. Maintain Warm Soil Temperatures

Cucumbers dislike cold roots. Use insulated pots, heating mats, or compost bedding to keep soil temperatures above 65°F (18°C).

2. Supplement Light if Needed

Short days can slow growth. Consider using LED grow lights or reflective materials to boost available light.

3. Use Vertical Trellising

Maximize space and airflow by training vines vertically using strings, nets, or stakes.

4. Monitor Humidity

Greenhouses in winter trap moisture. Excess humidity can encourage mold. Use fans or dehumidifiers to keep air circulating and humidity levels below 70%.

5. Ventilate Daily

Even in winter, brief daily ventilation helps manage condensation and reduce disease.

6. Feed Regularly

Winter cucumbers are still heavy feeders. Use a balanced liquid fertilizer every 7–10 days once plants are established.

Managing Pests and Diseases in Winter Greenhouses

Though many outdoor pests are inactive in winter, greenhouses can harbor problems like:

Aphids

Spider mites

Whiteflies

Fungus gnats

Introduce natural predators like ladybugs, or use neem oil and sticky traps as needed.

Common diseases include:

Powdery mildew

Downy mildew

Botrytis (gray mold)

Keep leaves dry, avoid overcrowding, and practice crop rotation even in containers to reduce pressure.

Conclusion

With the right varieties and a little attention to light and temperature, cucumbers can be a successful winter crop in greenhouses. Choose parthenocarpic hybrids like ‘Socrates’, ‘Tasty Jade’, or ‘Tyria’ that are bred specifically for low-light, cooler conditions. Support them with consistent warmth, humidity control, and regular feeding, and you’ll be harvesting sweet, crisp cucumbers even when snow covers the ground outside.

Whether you’re a home gardener looking to extend your harvest or a small-scale producer aiming for year-round produce, winter greenhouse cucumbers are a smart and satisfying crop to grow.

Helpful Reading 

Phyllo Dough Breakfast and Dessert Recipes and Meatloaf Recipes 

https://www.amazon.com/Phyllo-Dessert-Breakfast-Recipes-Meatloaf-ebook/dp/B0DMKZF4ZD/

Salad Magic: Growing Delicious Tomatoes, Cucumbers, & Lettuce 🥬 🍅

https://www.amazon.com/Salad-Magic-Delicious-Tomatoes-Cucumbers-ebook/dp/B0F1WZ7KK8/

Keyhole Gardening 

https://www.amazon.com/Bountiful-Beds-Mastering-Lettuce-Eco-Friendly-ebook/dp/B0FBRQ6S4X/

Regenerative Tomato Gardening 

https://www.amazon.com/Regrow-Earth-Beginners-Regenerative-Gardening-ebook/dp/B0FBN8C3YT/