Selecting the best plants for greenhouse in winter transforms your unheated or minimally heated structure into a productive growing space during the coldest months. Winter greenhouses allow gardeners to extend the growing season and enjoy fresh produce when outdoor gardens lie dormant.
Greenhouse cultivation during winter presents unique challenges including reduced light levels, colder temperatures, and higher humidity that can affect plant health. Cold-hardy varieties and carefully chosen crops thrive in these conditions, providing valuable harvests throughout the winter season.
Winter greenhouse plants serve multiple purposes, from providing fresh salads and herbs to brightening the space with colourful ornamental blooms. In particular, leafy greens, cold-tolerant vegetables, and hardy annuals perform exceptionally well in unheated winter greenhouses.
In this guide, best plants for greenhouse in winter are carefully reviewed based on cold tolerance, light requirements, growth speed, and overall productivity to help you confidently choose the perfect crops for your winter growing space.
Best Plants For Greenhouse In Winter
1. Winter Lettuce (Lactuca sativa) – Best Salad Green For Winter Greenhouse
Winter lettuce is the best salad green for winter greenhouse because it produces crisp, tender leaves throughout the coldest months with minimal heat requirements. Unlike summer varieties, cold-tolerant lettuce cultivars thrive in temperatures as low as 40-50°F without bolting or developing bitter flavours. Because of this, it remains a staple crop for winter greenhouse growers.
- 🥬 Winter Density Lettuce: 65 days until Maturity. Latin Name: Lactuca sativa. Open Pollinated. The plant produces heavy yields of dark green romaine lettuce. Leaves are tightly folded and have a delicious sweet flavor. Lettuce retains its crisp sweetness best when harvested in the morning.
- 🌱 Direct sow the seed in rich soil and full sun, spreading them as thinly as possible in rows 1-2' apart; when the seedlings begin to grow, thin them to a distance of 8-12". Winter Density Lettuce produces compact, dense heads with a crisp leaf texture and sweet, mild flavor. A perfect salad green, it works beautifully as a gourmet salad base, sandwich wrap, or garden fresh topping.
The fast-growing leaves provide multiple harvests through cut-and-come-again methods, ensuring a steady supply of fresh greens. Equally important, winter lettuce varieties like Winter Density and Arctic King have been bred specifically for cold-weather performance. With this in mind, they deliver reliable harvests when outdoor gardens are dormant.
Salad greens continue dominating winter greenhouse plantings due to their quick returns and minimal space requirements. Beyond that, lettuce grows well in containers and raised beds, making it accessible for greenhouse growers of all experience levels. To put it differently, winter lettuce provides fresh, nutritious leaves with minimal effort.
Pros:
- Cold tolerant
- Fast growth
- Multiple harvests
- Space efficient
- Nutritious leaves
- Easy growing
- Reliable yields
Cons:
- Heat sensitive
- Short shelf life
- Requires consistent moisture
2. Winter Spinach (Spinacia oleracea) – Best Leafy Green For Winter Greenhouse
Winter spinach is the best leafy green for winter greenhouse because it produces abundant, nutrient-dense leaves that thrive in cool temperatures without bolting. This cold-hardy crop continues growing through winter months, providing fresh greens when outdoor gardens are frozen solid. Consequently, it is a favourite among winter greenhouse gardeners.
- Spinacia oleracea - open pollinated - non-GMO - 95% Germination Rate for the Current Lot
- Fall/winter crop - suitable to harvest baby or full size leaves.
The dark green leaves are packed with vitamins and minerals, making them a valuable addition to winter diets. Additionally, winter spinach varieties like Giant Winter and Bloomsdale have been selected for exceptional cold tolerance and slow bolting. Therefore, they deliver reliable harvests throughout the coldest months.
Nutrient-dense leafy greens continue gaining popularity among winter greenhouse growers seeking healthy, homegrown produce. Furthermore, spinach grows well in cooler conditions and requires minimal heat input to maintain productivity. Overall, this crop delivers exceptional nutritional value with reliable cold-season performance.
Pros:
- Cold tolerant
- Nutrient dense
- Multiple harvests
- Slow bolting
- Easy growing
- Versatile use
- Reliable yields
Cons:
- Heat sensitive
- Requires rich soil
- Moderate growth
3. Winter Kale (Brassica oleracea) – Best Hardy Green For Winter Greenhouse
Winter kale is the best hardy green for winter greenhouse because it withstands freezing temperatures and actually improves in flavour after frost exposure. This remarkably tough crop continues producing nutritious leaves throughout winter, providing a reliable source of fresh greens. For this reason, it is a must-have for cold-season greenhouse growing.
- MIXED SEEDS! Super Tasty and Productive Varieties
- MIXED kale seeds: Dwarf Blue Curled, Lacinato Dinosaur, Siberian Dwarf, Russian Red.
The curly or flat leaves are packed with vitamins and antioxidants while the plant’s cold tolerance means it thrives with minimal greenhouse heating. Notably, winter kale varieties like Winterbor and Red Russian have been bred specifically for exceptional cold hardiness. In turn, growers enjoy abundant harvests throughout the coldest months.
Cold-hardy brassicas continue dominating winter greenhouse plantings due to their exceptional tolerance and nutritional value. At the same time, kale is remarkably easy to grow and requires minimal maintenance once established. Simply put, this crop delivers outstanding winter performance with reliable yields.
Pros:
- Extremely cold hardy
- Frost improves flavour
- Nutrient dense
- Continuous harvest
- Low maintenance
- Easy growing
- Reliable yields
Cons:
- Slow growth
- Requires space
- Can be tough
4. Winter Radish (Raphanus sativus) – Best Root Crop For Winter Greenhouse
Winter radish is the best root crop for winter greenhouse because it produces crisp, colourful roots in cool temperatures without bolting or becoming woody. Unlike summer radishes that quickly become pithy, winter varieties maintain their quality and texture throughout the cold season. Consequently, they provide a valuable crunchy addition to winter salads and dishes.
- Heirloom Winter Radish: Watermelon radish seeds produce large green roots with bright pink centers and mild flavor. Ideal radish seeds for planting in fall gardens and cool season vegetable beds.
- Fast Cool Season Harvest: Watermelon radish matures in about 55 days and reaches up to 3 inches wide. These winter radish seeds perform best when planted before fall frost in rich soil.
The fast-growing roots come in various colours including red, white, purple, and black, adding visual interest to winter harvests. Additionally, winter radish varieties like China Rose and Black Spanish have been selected for exceptional cold tolerance and storage ability. Therefore, they offer reliable yields with excellent keeping qualities.
Root crops continue gaining appreciation among winter greenhouse growers seeking diverse, nutritious harvests. Furthermore, radishes grow quickly and require minimal space, making them ideal for greenhouse cultivation. Overall, this crop delivers crunchy, colourful roots with reliable cold-season performance.
Pros:
- Fast growth
- Cold tolerant
- Colourful roots
- Good storage
- Space efficient
- Easy growing
- Versatile use
Cons:
- Heat sensitive
- Requires consistent moisture
- Limited varieties
5. Winter Herbs (Chives, Parsley, Thyme) – Best Herbs For Winter Greenhouse
Winter herbs including chives, parsley, and thyme are the best herbs for winter greenhouse because they provide fresh flavour throughout the coldest months with minimal heat requirements. These hardy perennials continue growing slowly in cool conditions, offering a continuous supply of culinary herbs. For this reason, they are indispensable for winter kitchen gardens.
- 15 Herb Seeds Variety Pack – 4,300 Seeds Included: Start your own herb garden with this all-in-one heirloom herbs seeds kit. Includes Genovese Basil, Sweet Basil, Italian Oregano, Rosemary, Thyme, Cilantro, Dill, Mint, Sage, Lavender, Chives, Garlic Chives, Parsley, Chervil, and Scallions. Each herb seed packet is USA-sourced and tested for high germination. Grow these herb garden seeds in your backyard, windowsill, raised beds, or pots for fresh flavors all season long.
- Herb Seeds for Hydroponic Garden and Indoor Pots: These herb seeds for planting indoors thrive in hydroponic systems, AeroGarden, kitchen windowsill planters, or traditional soil. Perfect herbal seeds for apartment dwellers and urban gardeners short on outdoor space. Grow fresh herbs year-round in containers as small as 4 inches. Ideal seeds for planting herbs for renters, condo owners, and city gardeners who want homegrown flavor without a backyard.
The aromatic leaves add fresh flavour to winter dishes while the plants themselves are remarkably resilient and require little maintenance. Notably, chives, parsley, and thyme all tolerate temperatures down to 20-25°F, making them ideal for unheated greenhouses. In turn, growers enjoy fresh herbs when outdoor gardens are dormant.
Kitchen herbs continue dominating winter greenhouse plantings due to their value and minimal space requirements. At the same time, these perennials return year after year, providing long-term value for greenhouse growers. Simply put, winter herbs deliver fresh flavour with exceptional reliability.
Pros:
- Cold tolerant
- Continuous harvest
- Perennial growth
- Space efficient
- Fresh flavour
- Low maintenance
- Long-term value
Cons:
- Slow winter growth
- Requires light
- Limited varieties
6. Winter Peas (Pisum sativum) – Best Legume For Winter Greenhouse
Winter peas are the best legume for winter greenhouse because they produce sweet, crunchy pods that thrive in cool temperatures without the pest problems common in summer crops. These fast-growing plants climb trellises and produce harvests throughout winter, adding variety to the cold-season diet. Consequently, they are a favourite among greenhouse growers seeking diverse produce.
- Cover Crop - Large premium packet of Austrian Winter Peas (Pisum sativum subsp. arvense) seeds. Winter-hardy and drought-tolerant cover crops can help cover the soil of your home garden beds during the off season. We've included enough seed in one packet to cover an 8' x 4' garden bed. Minimum of 17 g per packet (about 200 seeds).
- Productive - Winter Peas germinate in 7-14 days when soil temps are 55-70°F. Plant 1.5” deep and space 6” apart in an area with full sun. This variety will grow 2-3’ tall with a spread of 6-18”. Pods will mature in 200-210 days (over winter), plant in USDA zones 6-10.
The tender pods can be eaten fresh or cooked, while the plants also fix nitrogen in the soil, benefiting subsequent greenhouse crops. Additionally, winter pea varieties like Oregon Sugar Pod and Dwarf Grey Sugar have been selected for exceptional cold tolerance and productivity. Therefore, they offer both immediate harvests and long-term soil benefits.
Legume crops continue gaining popularity among winter greenhouse growers seeking sustainable, productive additions to their growing space. Furthermore, peas grow vertically, maximising greenhouse space and providing attractive greenery. Overall, this crop delivers sweet pods with valuable soil improvement benefits.
Pros:
- Cold tolerant
- Sweet pods
- Nitrogen fixing
- Vertical growth
- Space efficient
- Easy growing
- Reliable yields
Cons:
- Requires support
- Limited harvest
- Moderate growth
7. Winter Cyclamen (Cyclamen coum) – Best Flowering Plant For Winter Greenhouse
Winter cyclamen is the best flowering plant for winter greenhouse because it produces stunning pink, white, or magenta blooms throughout the coldest months. These hardy perennials thrive in cool, bright conditions, adding vibrant colour to the winter greenhouse when little else flowers. For this reason, they are essential for ornamental winter displays.
- 🔴 Stunning Winter Color: Bursts with bright red berries after leaves drop, creating a bold, eye-catching display all winter long
- 🐦 Wildlife Favorite: Provides an important cold-season food source for birds and supports native ecosystems
The delicate, upswept flowers rise above attractive silver-patterned foliage, creating a beautiful winter display. Additionally, cyclamen coum is remarkably cold-hardy and continues flowering even when temperatures drop near freezing. Therefore, it provides reliable winter colour with minimal heating requirements.
Flowering plants continue gaining appreciation among greenhouse growers seeking to brighten the winter months. Furthermore, cyclamen are low-maintenance and can be grown in containers or border plantings. Overall, this plant delivers stunning winter colour with exceptional cold tolerance.
Pros:
- Beautiful winter blooms
- Cold tolerant
- Attractive foliage
- Container suitable
- Low maintenance
- Varied colours
- Long flowering
Cons:
- Summer dormancy
- Requires good drainage
- Moderate growth
8. Winter Pansies (Viola x wittrockiana) – Best Cool-Season Annual For Winter Greenhouse
Winter pansies are the best cool-season annual for winter greenhouse because they produce cheerful, colourful flowers throughout the coldest months with minimal care. These hardy annuals tolerate freezing temperatures and continue blooming when other plants are dormant, adding vibrant colour to the greenhouse. Consequently, they are a favourite for winter container displays.
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The large, face-like flowers come in virtually every colour, providing endless design possibilities for greenhouse displays. Additionally, winter pansies are remarkably cold-tolerant and can survive temperatures down to 10-15°F without protection. Therefore, they are ideal for unheated greenhouses.
Cool-season annuals continue dominating winter greenhouse plantings due to their reliable colour and easy care nature. Furthermore, pansies bloom continuously through winter and into early spring, providing long-lasting displays. Overall, these plants deliver cheerful colour with exceptional cold tolerance.
Pros:
- Vibrant colours
- Extremely cold hardy
- Continuous blooming
- Container suitable
- Low maintenance
- Versatile placement
- Long flowering
Cons:
- Short lifespan
- Heat sensitive
- Requires deadheading
9. Winter Primrose (Primula vulgaris) – Best Early-Spring Bloomer For Winter Greenhouse
Winter primrose is the best early-spring bloomer for winter greenhouse because it produces clusters of cheerful yellow flowers from late winter into spring. These hardy perennials thrive in cool, bright conditions and provide some of the earliest colour in the greenhouse year. For this reason, they are valuable additions to winter growing spaces.
- LIVE PLANT: Enjoy this white flower plant that is ready to plant and grown in our nursery by experienced growers. This white Christmas Rose shrub is easily grown in organically rich, humusy, well-drained soil in part shade to full shade.
- READY TO PLANT: This beautiful ChristmasRose plant arrives fully rooted in the soil and can be planted immediately upon arrival, weather permitting. These creamy white petals bloom profusely in early spring.
The bright yellow flowers appear when little else is blooming, bringing welcome colour to the winter greenhouse. Notably, primroses are remarkably cold-hardy and continue flowering even through frosty conditions without protection. In turn, gardeners enjoy reliable early colour with minimal effort.
Early-flowering plants continue gaining appreciation among greenhouse growers seeking to extend the flowering season. At the same time, primroses are low-maintenance and can be grown in containers or border plantings. Simply put, these plants deliver cheerful early colour with exceptional reliability.
Pros:
- Early spring blooms
- Bright yellow flowers
- Cold tolerant
- Container suitable
- Low maintenance
- Hardy perennial
- Long flowering
Cons:
- Summer dormancy
- Requires moisture
- Limited colours
10. Winter Cabbage (Brassica oleracea) – Best Brassica For Winter Greenhouse
Winter cabbage is the best brassica for winter greenhouse because it produces dense, flavourful heads that store well and thrive in cold conditions. This hardy vegetable continues developing through winter, providing substantial harvests when fresh produce is scarce. Consequently, it is a valuable addition to the winter greenhouse.
- ROUND COMPACT HEADS - Early Round Dutch cabbage (Brassica oleracea var. capitata) forms 5–7 pound tight green heads with mild flavor, excellent for coleslaw, cooking, or fermenting sauerkraut
- FAST MATURING VARIETY - Early crop with cabbage heads ready in about 85 days, dependable in shorter seasons and productive for spring or fall gardens
The solid heads can be harvested gradually or stored for extended periods, providing a reliable winter vegetable supply. Additionally, winter cabbage varieties like January King and Danish Ballhead have been selected for exceptional cold tolerance and storage ability. Therefore, they offer reliable yields with excellent keeping qualities.
Brassica crops continue dominating winter greenhouse plantings due to their cold tolerance and substantial harvests. Furthermore, cabbage is relatively easy to grow and requires minimal maintenance once established. Overall, this crop delivers dependable winter harvests with excellent storage potential.
Pros:
- Cold tolerant
- Substantial harvests
- Excellent storage
- Nutritious leaves
- Easy growing
- Reliable yields
- Versatile use
Cons:
- Slow growth
- Requires space
- Moderate maintenance
Best Plants For Greenhouse In Winter FAQs
1. What are the best plants for greenhouse in winter?
Winter lettuce, spinach, kale, radishes, herbs, and winter cabbages are among the best plants for greenhouse in winter. These cold-hardy crops thrive in cool temperatures and provide valuable harvests when outdoor gardens are dormant.
2. How warm should a winter greenhouse be?
Most winter greenhouse crops thrive at temperatures between 40-55°F. Unheated greenhouses in mild climates can maintain these temperatures naturally, while colder regions may need minimal heating to prevent freezing and maintain productivity.
3. Can I grow tomatoes in a winter greenhouse?
Tomatoes are not suitable for winter greenhouses in most climates because they require warm temperatures and high light levels. Focus on cold-hardy crops like leafy greens, root vegetables, and brassicas for winter production.
4. How often should I water winter greenhouse plants?
Water winter greenhouse plants less frequently than summer crops because growth slows in cooler temperatures. Check soil moisture regularly and water when the top inch feels dry. Avoid overwatering, which can lead to root rot in cold conditions.
5. Do winter greenhouse plants need supplemental lighting?
Supplemental lighting can benefit winter greenhouse plants during short, cloudy days. Leafy greens and herbs grow well with 12-14 hours of light, while some flowering plants may need longer periods. LED grow lights are energy-efficient options.
6. What herbs grow best in winter greenhouse?
Chives, parsley, thyme, rosemary, sage, and mint are excellent herbs for winter greenhouse growing. These hardy perennials tolerate cool temperatures and provide fresh flavour throughout the cold season with minimal maintenance.
7. How do I prevent frost damage in a winter greenhouse?
Prevent frost damage by using row covers, bubble wrap insulation, or adding thermal mass like water barrels to absorb and release heat. Ventilate on sunny days to prevent overheating and condensation, and use frost cloths for sensitive plants.
Conclusion
In conclusion, Winter Lettuce earned the title of best overall choice for winter greenhouse growing because it combines fast growth, cold tolerance, and continuous harvest potential in a compact, easy-to-grow package. Winter Spinach secured the runner-up position thanks to its exceptional nutritional value, reliable cold-season performance, and versatile culinary uses.
Finding the best plants for greenhouse in winter depends on your specific growing space, heating capabilities, and dietary preferences. At the same time, combining leafy greens, root crops, herbs, and ornamental flowers creates a diverse and productive winter growing space.
Modern winter greenhouse growing continues evolving with greater appreciation for cold-hardy varieties that deliver fresh produce during the coldest months. Because of these developments, gardeners now enjoy more options than ever for extending their growing season.
The right plant choices should transform your greenhouse into a productive winter garden that provides fresh, nutritious harvests throughout the cold season. Explore these top-rated options today and start growing your own winter greenhouse garden.