Here are 10 of the best plants to grow in a winter greenhouse, plus winter gardening tips.

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This post is all about the best plants to grow in a winter greenhouse.

Dreaming of fresh vegetables and herbs in the heart of winter? Do you wish that it was spring already, so that you can go out and dig in the garden again?

Depending on where you live, with the right crops and a little planning, your greenhouse can be a year round source of homegrown produce—even during the coldest months.

Whether you’re working with a backyard setup or exploring small greenhouse gardening in winter, there’s no shortage of options for hardy, productive plants that thrive in cooler conditions. From leafy greens to root vegetables, mastering winter sowing and growing in an unheated greenhouse is both a fun challenge and a great way to enjoy garden fresh flavors all year.

In this post, we’ll explore the best greenhouse vegetables for winter, highlight top choices for growing herbs in a greenhouse winter, and offer tips for growing plants in a cold greenhouse.

The Best Winter Greenhouse Plants

Winter greenhouse gardening is a rewarding way to keep your green thumb busy year round. Here are ten fantastic plants to grow in a greenhouse during the winter, each with its own charm and unique uses in the kitchen. Let’s explore!

1—Spinach

Spinach is a cold hardy leafy green that thrives in cooler months, making it ideal for a winter greenhouse. It matures in about 30 to 45 days, so you can enjoy multiple harvests throughout the season.

Spinach prefers well drained soil and a consistent watering schedule, with plenty of sunlight during the day. In the kitchen, it’s a versatile powerhouse—blend it into green smoothies, toss it in salads, or sauté it with garlic for a quick, nutritious side dish.

2—Radishes

Radishes are one of the fastest growing winter vegetables, ready to harvest in as little as 25 to 30 days. They’re low maintenance and thrive in cool soil, needing moderate sunlight and regular watering.

Radishes add a spicy crunch to salads, but don’t overlook roasted radishes—they become delightfully sweet and caramelized from being baked in the oven. The greens are edible too, perfect for making pesto or as a sautéed green.

3—Carrots

Carrots are a challenge because they require—among other things—loose, sandy soil and patience. Depending on the variety, carrots can take 50 to 80 days or more to mature.

While they prefer cooler temperatures, maintaining consistent moisture in the soil is key. Although carrots can be persnickety about growing, the flavor of a homegrown carrot can be hard to beat.

Sweet and crunchy, carrots are perfect for roasting, adding to soups, or shredding into winter salads. Pro tip: try growing colorful varieties like purple or yellow for extra visual appeal!

4—Kale

Kale is a winter greenhouse favorite, and it’s hardy and easy to grow. Most varieties take about 50 to 70 days to mature, but you can start harvesting baby leaves sooner.

Kale loves rich soil, plenty of water, and good air circulation. The greens are a winter kitchen superstar—you can use kale in hearty soups, bake it into crispy kale chips, or massage it into salads with a lemony dressing to soften its texture.

5—Parsley

Parsley is a slow growing herb, taking about 70 to 90 days to reach full maturity, though you can harvest leaves earlier as needed. It thrives in moist, fertile soil and benefits from consistent pruning to encourage new growth.

Due to it’s slow growing habit, it’s best to start with a well established plant when growing parsley in a greenhouse in winter if you want to harvest the leaves during the winter season.

Parsley is an essential herb in the kitchen, adding bright, herb flavor to a variety of dishes from soups to stews, garnishing roasted meats, or being blended into chimichurri or tabbouleh.

6—Beets

Beets are another fun winter crop, offering both edible roots and greens. They mature in 50 to 70 days, and like carrots, they need loose soil for proper development.

Beets thrive in cool temperatures with regular watering. Roast them for salads, blend them into smoothies, or even pickle them for a tangy snack. Don’t forget to add a few baby beet greens to a mixed greens salad or to sauté the greens for a delicious bonus!

7—Lettuce

Lettuce is perfect plant for beginners or impatient gardeners because it grows quickly—many varieties mature in 30 to 50 days. It thrives in cooler temperatures with plenty of light and prefers slightly moist, well drained soil.

With endless varieties like butterhead, romaine, or frilly oakleaf, you can grow different kinds of lettuce to create stunning winter salads. Use lettuce leaves as wraps for healthy snacks or to add fresh crunch to sandwiches.

8—Broccoli

Broccoli can be a bit more demanding to grow than lettuce, but it is worth the effort. Many varieties take around 60 to 100 days to reach maturity.

Broccoli loves rich, nitrogen-heavy soil and plenty of sunlight. Make sure to provide adequate ventilation to prevent mildew.

9—Chard (Swiss Chard)

Chard is another cold hardy green that brings vibrant color to your greenhouse. It matures in about 50 to 60 days, though you can harvest baby leaves earlier. The baby leaves taste delicious in salads.

Chard is generally a low maintenance vegetable, but it appreciates regular watering and occasional fertilizing. Chard is great for sautéing with garlic, adding to soups, or using as a colorful wrap for stuffing ingredients like grains or cheeses.

10—Peas

Winter greenhouse peas, particularly sugar snap or snow peas, are delightful to grow. They add nice color to a garden, and the flowers are beautiful.

Garden peas mature in about 60 to 70 days, depending on the variety, and they need a trellis or support to climb. Peas love cool temperatures and moderate sunlight.

Freshly picked peas are incredibly sweet and can be eaten raw, added to stir fries, or tossed into pastas. The tender pea shoots are also edible and make a lovely garnish or addition to salads.

Bonus: Winter Herbs

Winter hardy herbs like thyme, sage, and chives are perfect for growing in an unheated winter greenhouse. With prices of fresh herbs in the grocery store often being expensive, sometimes it can be great to grow your own.

Thyme is a resilient perennial that thrives in cooler temperatures, and it adds earthy flavor to soups and roasted veggies. Sage—another tough herb—stays vibrant in the cold and is ideal for hearty dishes like stews or stuffing.

Chives are fast growing and cold tolerant, offering a fresh, oniony kick to salads, eggs, and baked potatoes. They can also be perennial, meaning that they can grow in a garden year after year.

These herbs not only survive the winter but bring fresh, homegrown flavor to your kitchen when you need it most! Plus, they add brilliant color to a winter landscape covered in gray skies and snow.

Each of these winter garden plants brings its own unique challenges and rewards, but there’s nothing more satisfying than nurturing them through the winter months and having the chance to see your hard work pay off in fresh, flavorful produce.

As with any gardening endeavors, your experience may vary. Success in growing plants in a winter greenhouse may depend on a variety of factors, including plant type and environmental factors. Below are some things to consider when planning to grow plants in a greenhouse in winter.

5 Important Things to Know About Growing Plants in Winter

Growing vegetables and herbs in a winter greenhouse can be fun and interesting, but there are some important factors to consider when planning a winter garden. Here are five of the most important things to know about growing plants in a greenhouse in winter:.

1—Temperature

Maintaining consistent temperatures is crucial. Most winter vegetables (like spinach, lettuce, and kale) thrive in cool conditions, between 40–70°F, depending on the crop. Some gardeners use frost blankets to cover plants on especially cold nights, but be careful not to let temperatures get too warm, as that can stress plants. Look for cold hardy plants that can withstand cold temperatures in an unheated greenhouse.

2—Daylight and Supplemental Lighting

Winter days are shorter, and reduced sunlight can slow photosynthesis, impacting the growth of plants. Leafy greens like lettuce and spinach are more tolerant of low light, while crops like peas or broccoli may benefit from supplemental grow lights to encourage steady development.

3—Slower Growth and Days to Maturity

In winter, plants naturally grow slower due to reduced light and cooler temperatures. For example, radishes or lettuce might take a bit longer than their usual 25 to 50 days to mature. Be patient and focus on cold hardy crops that are specifically bred for winter growing.

4—Pests and Diseases in Winter

Even in the colder months, pests like aphids and fungus gnats can thrive in a greenhouse environment. Fungal diseases are also a risk due to higher humidity levels. Regularly inspect your plants for signs of pests and diseases, maintain good airflow, and space them properly to help minimize these issues.

5—Water Wisely

Plants need less water in winter because they grow slower and the cool air reduces evaporation. Overwatering can lead to root rot or fungal diseases. Always check soil moisture and use lukewarm water to avoid shocking the plants.

These principles can help keep your winter greenhouse thriving, ensuring a steady supply of fresh vegetables and herbs throughout the season.

Gardeners looking for more information on winter gardening can reach out to their local extension service, which offers region specific advice and resources, or join a master gardener’s club for expert tips and a supportive gardening community. Some universities and agricultural organizations also provide free online guides that are tailored to winter greenhouse growing, so those can be another resource to look for on the internet.

Winter greenhouse gardening is the perfect way to keep your love of growing alive, even when it’s cold outside. Whether you’re harvesting tender lettuce, experimenting with colorful carrots, or adding homegrown herbs to your favorite dishes, the satisfaction of nurturing plants through the winter can be unmatched.

It’s not always easy—shorter days, slower growth, and the occasional pest or disease can test your patience—but that’s what makes it so rewarding. With the right plants, a bit of determination, and a love for the process, it’s possible to turn a winter greenhouse into a thriving oasis of green in no time. Happy gardening!

Looking for more easy gardening tips and ideas?

This post was all about winter gardening plants to grow in a greenhouse.

The Best Greenhouse Plants for Winter