15 Best Things to Grow in a Greenhouse in Winter

Winter doesn’t have to mean the end of your gardening season. With a greenhouse, you can keep growing delicious vegetables, fresh herbs, and even colorful flowers year-round.

The key is choosing crops that thrive in cooler temperatures and protected environments. Whether you’re a beginner or a seasoned gardener, here are 15 wonderful plants that will flourish inside your greenhouse this winter.

1. Spinach

Spinach loves cooler weather and grows beautifully in greenhouse conditions. It matures quickly and can be harvested continuously by picking the outer leaves first.

To keep it happy, maintain moderate humidity and consistent moisture in the soil. Spinach is packed with nutrients, making it one of the best leafy greens for winter harvesting.

2. Kale

Kale is incredibly resilient, thriving even in chilly weather. Greenhouses allow you to grow softer, sweeter leaves during winter.

Plant curly or Tuscan varieties, and they’ll produce fresh greens for months. Regular picking encourages new growth, ensuring a steady supply of superfood goodness.

3. Lettuce

Lettuce is perfect for winter greenhouse gardening because it prefers cool temperatures. Loose-leaf varieties grow quickly and can be harvested multiple times.

Space the plants evenly and provide gentle airflow to prevent mold. With a little care, you’ll enjoy crisp, homegrown salads even in the coldest months.

4. Carrots

Carrots develop their sweetest flavor in cool conditions, making them an ideal winter greenhouse crop. The greenhouse protects them from frost, helping them grow straight and strong.

Choose shorter varieties like Nantes or Chantenay, which mature faster in limited light. Keep the soil loose and well-drained for perfect roots.

5. Radishes

If you love quick-growing crops, radishes are a must. They sprout and mature in just three to four weeks, perfect for continuous planting all winter long.

Plant in shallow trays or beds and keep the soil slightly moist. Their peppery crunch adds flavor to winter salads and soups.

6. Garlic

Garlic thrives in cooler weather and grows well in greenhouse beds or pots. Plant cloves in loose, well-drained soil, spacing them about four inches apart.

The greenhouse helps protect garlic from pests and excessive moisture. You’ll be rewarded with strong, flavorful bulbs in early spring.

7. Onions

Onions can easily overwinter in a greenhouse, producing fresh greens or full bulbs depending on the variety. Start from sets or seeds for the best results.

Good airflow and moderate watering are key to preventing rot. You can harvest green onions earlier or wait for larger bulbs later in the season.

8. Herbs (Parsley, Cilantro & Chives)

Fresh herbs bring life to any winter kitchen, and most thrive indoors. Parsley, cilantro, and chives all handle cooler temperatures well.

Plant them in containers or raised beds with good drainage. Regular trimming keeps them growing strong and provides an endless supply for cooking.

9. Beets

Beets are another cold-hardy root vegetable that flourishes under glass. The greenhouse keeps the soil warm enough for steady root growth.

Choose early varieties like Detroit Dark Red or Boltardy. You’ll get both tender roots and delicious beet greens for salads and sautés.

10. Peas

Peas adore cool weather and reward you with crisp, sweet pods. Choose dwarf or bush varieties that fit easily in greenhouse beds.

Provide trellises or mesh for climbing and keep the soil slightly moist. The controlled environment means no frost damage—just fresh peas all winter.

11. Cabbage

Cabbage can handle the cold, but a greenhouse gives it a steady growing environment, preventing damage from frost and pests.

Compact varieties like Savoy or Golden Acre are perfect for smaller spaces. The result is crisp, tightly packed heads ideal for soups, salads, and stir-fries.

12. Strawberries

Yes, you can enjoy strawberries even in winter! Greenhouses let you extend the season with steady warmth and light.

Plant everbearing varieties in containers or hanging baskets. Keep them slightly warm with fleece or heat mats, and they’ll reward you with juicy berries when it’s snowing outside.

13. Broccoli

Broccoli is another hardy vegetable that loves cooler temperatures. The greenhouse ensures consistent conditions for healthy, compact heads.

Plant seedlings in deep beds and provide good ventilation. Once harvested, side shoots continue to grow, giving you multiple yields from a single plant.

14. Swiss Chard

Swiss chard is one of the most colorful and reliable greenhouse greens. It thrives in winter light and can be harvested leaf by leaf.

Keep it well-watered and remove older leaves to encourage fresh growth. The vibrant stems bring both nutrition and beauty to your garden.

15. Winter Flowers (Pansies, Primroses & Violas)

Who says greenhouses are just for veggies? Winter flowers like pansies, primroses, and violas bring cheer to cold, gray months.

Plant them in pots or trays near the edges of your vegetable beds. Their bright blooms add color and warmth to your greenhouse, lifting your spirits on chilly days.

Bringing Life to Winter Days

Your greenhouse can become a thriving oasis even when the world outside is frozen. From leafy greens and root veggies to sweet berries and fragrant herbs, winter growing is all about smart choices and steady care.

So bundle up, step inside, and watch your plants flourish. With the right crops and a little love, your greenhouse will stay full of color, flavor, and life all winter long.