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A traditional homemade cold frame

In agriculture and gardening, a cold frame is a transparent-roofed enclosure, built low to the ground, used to protect plants from adverse weather, primarily excessive cold or wet. The transparent top admits sunlight and prevents heat escape via convection that would otherwise occur, particularly at night. Essentially, a cold frame functions as a miniature greenhouse to extend the growing season.[1]

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). This allowed seeds to be germinated in the greenhouse and then easily moved to the attached cold frame to be "hardened-off"[2] before final planting outside.[3] Cold frames are similar to some enclosed hotbeds,[4] also called hotboxes. The difference is in the amount of heat generated inside. This is parallel to the way that some greenhouses are called "hothouses" to emphasize their higher temperature, achieved either by the solar effects alone or by auxiliary heating via a heater or HVAC system of some kind.

Cold frames are found in home gardens and in vegetable farming. They create microclimates that provide several degrees of air and soil temperature insulation, and shelter from wind. In cold-winter regions, these characteristics allow plants to be started earlier in the spring, and to survive longer into the fall and winter. They are most often used for growing seedlings that are later transplanted into open ground, and can also be a permanent home to cold-hardy vegetables grown for autumn and winter harvest.


Cold frame construction is a common home or farm building project, although kits and commercial systems are available. A traditional plan makes use of old glass windows: a wooden frame is built, about one to two feet tall, and the window placed on top. The roof is often sloped towards the winter sun to capture more light, and to improve runoff of water, and hinged for easy access. Clear plastic, rigid or sheeting, can be used in place of glass. An electric heating cable, available for this purpose, can be placed in the soil to provide additional heat.


Cold frames can be used to extend the growing season for many food and ornamental crops, primarily by providing increased warmth in early spring. This means that it's possible to harvest vegetable crops ahead of their normal season when they are extremely expensive to buy. Some crops suitable for growing in a cold frame include lettuces, parsley, salad onions, spinach, radishes and turnips etc. One vegetable crop can occupy the whole of a cold frame or a combination of crops can be grown so that they mature in rotation in order to get a wide range of different vegetables throughout the year from a single cold frame.

Bulb frame[edit]

A "bulb frame" is a specialized kind of cold frame, designed for growing hardy or almost hardy ornamental bulbous plants, particularly in climates with wet winters. Typically it is raised further above ground level than a normal cold frame, so that the plants can be seen better when in flower. They are often used for the cultivation of winter-growing bulbs which flower in the autumn or spring. The covers are used in winter to provide some protection from very bad weather, while allowing good ventilation. Then in the summer, the covers provide dry, warm conditions which many such bulbs need.[5]

See also[edit]


  1. ^ "Cold Frame as Season Extension from Grass to Greens". www.grass2greens.com. Retrieved 19 November 2014. 
  2. ^ coldframe.org.uk
  3. ^ "A brief history of cold frames". coldframe.org.uk. 
  4. ^ merriam-webster.com
  5. ^ Mathew, Brian (1997). Growing Bulbs : The Complete Practical Guide. London: Batsford. ISBN 978-0-7134-4920-4.  Pp. 32–34

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Cold_frame — Please support Wikipedia.
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1224 news items

Kankakee Daily Journal
Tue, 14 Apr 2015 22:07:53 -0700

There are several other violets sitting on the same shelf and no problem. Can you give me an idea as to what is wrong? Also, I have part of a blue pool cover, it looks like bubble wrap. Could this be used for a cover on a cold frame or will the color ...

The News Journal

The News Journal
Tue, 21 Apr 2015 13:49:32 -0700

Some people say they are a type of cold frame. They are small enough to move easily and usually come down once the season warms up and the plants are exposed. Greenhouses are the most confusing of all, especially when they look like High Tunnels.
The Denver Post
Thu, 16 Apr 2015 23:11:15 -0700

Hardy to zone 4, once potted, they all went out into my cold frame. Lilies, eremurus and 'Lucifer' crocus also get the pot/cold frame treatment. All are hardy and so they could go straight out into the garden, but experience has proven they do better ...
Kenosha News
Wed, 22 Apr 2015 10:48:45 -0700

Some gardeners use a cold frame for hardening, but make sure to monitor it well so you don't get extreme sun. Always keep a close eye on the moisture needs because the small pots will dry out quickly. Also watch the weather for threat of frost. By the ...


Thu, 23 Apr 2015 08:33:45 -0700

Mice and slugs like grazing seedlings – take precautions. • Prick out into good compost, and pot on regularly if needs be. • Harden off seedlings in a cold frame or on the sunny, sheltered side of the house before planting out. READ: Eight exotic ...
The Buckeye Lake Beacon
Thu, 23 Apr 2015 06:30:00 -0700

The show is at the Fairgrounds Coliseum May 1 and May 2. The show features flower and vegetable plants, hanging baskets, trees, shrubs and herbs, a mushroom grower with shitake mushroom logs, cold frame ideas, craft vendors and educational displays.

Ellwood City Ledger

Ellwood City Ledger
Thu, 16 Apr 2015 00:41:15 -0700

A cold frame is a simple, familiar gardening device — just a bottomless box set on the ground, topped with a framed glass or clear plastic lid, and vented to release excess heat. It's built higher in back, to tilt the lid toward the sun. Tilting the ...

The Independent (blog)

The Independent (blog)
Thu, 23 Apr 2015 02:00:00 -0700

These need warmth to germinate, then once they are large enough they should be hardened off gradually – indoors on a windowsill, then daytimes outside and brought in at night, or in a cold frame, before planted out in May. I sowed three varieties of ...

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