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InsightHorizon Digest

What can I grow in cold frame

Author

John Parsons

Updated on April 09, 2026

Arugula.Broccoli.Beets.Chard.Cabbage.Green onion.Kale.Lettuce.

What can I do with a cold frame?

  • Overwintering dormant plants. In a sunken cold frame, the ground insulates and the sun gives warmth, but you still need to eliminate pockets of cold air that can harm overwintering plants. …
  • Giving seedlings an early start. …
  • Hardening off young seedlings. …
  • Extending the season past frost.

Can I grow seeds in a cold frame?

Seeds and seedlings stay warm in a cold frame. Most seeds germinate best at 70 to 75 degrees Fahrenheit, and the temperature inside a cold frame is usually 3 or 4 degrees warmer than outside. When a frame is in direct sun and its lid is down, it can be more than 10 degrees warmer.

What seeds can you start in a cold frame?

Gardeners have had much success using a cold frame for tomatoes, peppers, and all vine crops, such as squash, cucumbers and melons. Gardeners also use them for all the popular flower varieties such as zinnias, sunflowers, petunias and impatiens, just to name a few.

Can I grow strawberries in a cold frame?

Strawberries are versatile plants that can be grown in a number of different ways: in the open ground, in cold frames and under glass, in raised beds, pots and containers and hanging baskets. … These can be planted in autumn or early spring as bare root runners (young plants).

Can I start tomatoes in a cold frame?

Tomatoes, planted in many home gardens, are typically a warm-weather crop. … Planting tomatoes in a cold frame allows you to start your seedlings six to eight weeks before the danger of frost is past.

What can you grow in a cold frame over winter?

The system is used primarily to grow salad greens; spinach, chard, máche, claytonia, arugula, and a variety of lettuces grow well in cold frames. However, it can also be used to grow other vegetables such as scallions, radishes, carrots, and leeks.

Can I grow lettuce in a cold frame?

Using a Cold Frame to Overwinter Plants Hardy salad leaves from winter lettuce to mizuna to corn salad (lamb’s lettuce or mache) can be sown in the frame in late summer and will keep in great condition over winter.

Can you grow potatoes in a cold frame?

In our 4 x 8 cold frame beds we can plant about 10 pounds of seed potatoes total in the two trenches we dig. … When you cut the seed potatoes be sure that each piece has 2 or 3 eyes. Put the cut side down with the eyes up. Next we just barely cover up the potatoes with maybe just an inch of soil.

Is a cold frame the same as a greenhouse?

The biggest difference between a cold frame and a greenhouse is that a cold frame typically doesn’t use a heat source and might only stand a few feet tall; whereas a greenhouse is a tall structure that has heating and ventilation systems for a year-round controllable climate.

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How do you start plants in a cold frame?

Start by choosing a good location for your cold frame. It needs sunlight to work, so look for a sunny spot with southern exposure. You can even dig into a southern slope to get sunlight and insulation. Make sure the spot will drain well too, to avoid standing water.

Can you start peppers in a cold frame?

All but the most heat-loving vegetables (like tomatoes and peppers) can be started in a cold frame. The biggest advantage of growing with a cold frame is that your plants can get in the soil right away, without enduring the unnecessary stress of having their roots constricted in trays.

Should a cold frame be buried?

Where To Locate Cold Frames. Cold frames should be placed in a southern-facing location. They perform best when buried down 6 to 12″ inches into the soil. This helps to take full advantage of thermal ground heat.

Can I grow herbs in a cold frame?

Cold frame – Cold frames are a game-changer in the winter garden. They offer ample space for growing kitchen herbs like chives, oregano, Italian parsley, and marjoram.

Can you grow cucumbers in a cold frame?

If you do not have a greenhouse, you can grow cucumbers in a coldframe – hence the name frame cucumbers. Thirdly, the coldframe provides an intermediate stage between greenhouse and planting out in the great outdoors. This process is known as hardening off.

What do you do with a cold frame in the summer?

Extend the harvest of warm-weather summer crops. Grow salad greens and other compact cool-weather crops. Place the portable frame over the garden bed to provide frost protection and added daytime warmth to keep late summer and cool-season crops growing.

Does a cold frame protect from frost?

Cold frames can protect your plants from frost, but you need to remember to keep the frame closed at night. On days where the weather is particularly harsh, covering your cold frame with bubble wrap, blankets or layers of newspapers will provide your plants with extra warmth, helping to protect them from the frost.

Do cold frames have bases?

Parts of a cold frame: Bottom – A bottom is not necessary for your cold frame. Most people just use soil. If you decide to create a base for your cold frame, make sure it allows water to drain.

What are early potatoes?

First early potatoes First early or ‘new’ potatoes are so-called because they are the earliest to crop, in June. They take 10-12 weeks to mature. Plant 30cm apart, with 60cm between rows, around 12cm deep. Recommended varieties: ‘Red Duke of York’, ‘Lady Christl’, ‘Orla’ and ‘Rocket’.

When should I start lettuce in a cold frame?

A cold-frame timetable Probably the most important point in using a cold frame is to start your plants early enough. I begin in mid-July, sowing seeds for slow-growing or heat-tolerant crops like scallions, chard, parsley, and for winter greens such as escarole, endive, dandelion, and radicchio.

How do I keep slugs out of my cold frame?

Re: Slugs in my cold frame – quick fix anyone? Dissolve the salt in warm water, and paint it on to the sides of the cold frame, also on the top edges/faces of it. In effect a couple of bands of salt.

Where is the best place to put a cold frame?

Where is the best place to put a cold frame? To maximize warmth, light exposure, and weather protection for plants, cold frames should be sited in a south-facing position. Other site considerations are drainage and protection from wind.

What is the point of a cold frame?

Cold frames protect plants from strong winds and retain heat. Gardeners use cold frames to extend their gardening season—both in the autumn to protect plants for a few more weeks and in the spring to get a jumpstart on sowing seeds. Cold frames are also used to “harden off” seedlings that were started indoors.

Why use a cold frame greenhouse?

Cold frames also provide a level of shelter and protection from wind and unpredictable external weather without overheating plants. With the added protection and slightly warmer environment, cold frames simply help prolong the growing season and ensure plant safety.

Why is it called a cold frame?

Historically, cold frames were built to be used in addition to a heated greenhouse. The name itself exemplifies the distinction between the warm greenhouse and the unheated cold frame. They were frequently built as part of the greenhouse’s foundation brickwork along the southern wall (in northern latitudes).

How much earlier can you plant in a cold frame?

If sowing directly into the cold frame, have it in place 2 weeks before seeding to warm the soil. If you start them inside and transfer them to the frame, you can start those 6 weeks earlier than normal. Keep an eye on the amount of sun, moisture, temps, and wind within the frame.

Does a cold frame need to be airtight?

Does a cold frame need to be airtight? No, a cold frame does not have to be airtight. In fact, it is better if it isn’t airtight to allow oxygen and carbon dioxide to move around.

How do you harden seedlings in a cold frame?

To begin hardening off plants, place them into a shaded cold frame on a cloudy day for a few hours. Then, close the frame. Gradually, increase the amount of sunlight the transplants receive and how long the frame remains open each day.

What is the best container for growing strawberries?

The best pots for strawberries are those which are urn-shaped, punctuated with holes down the sides in variable areas. Even though the holes make the pot look like dirt, water or even the plant may fall out of them, these pots are perfect for growing strawberries in containers.

What month is best to plant strawberries?

Strawberries are best planted in the spring, as early as several weeks before the last frost date. By selecting a range of strawberry varieties you can spread your harvest from late spring through to early fall.

What happens if you plant strawberries too close together?

Planting Strawberries Close Together A close spacing of 8-12″ between plants will keep weeds down while maximizing berry harvest. The plants will, however, be competing for sunlight and nutrients, meaning that the berries might be smaller than if the plants were far apart.