digplanet beta 1: Athena
Share digplanet:


Applied sciences






















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.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

1721 news items

Grand Junction Daily Sentinel
Fri, 05 Feb 2016 22:56:15 -0800

I would try to not let your cold frame go below 25 degrees for much more than a couple of hours. For the geranium, I'd try to keep it above 28 degrees. I am trying to find good plants for a flower bed that is almost always in the shade. I am looking ...
Bucks County Courier Times
Fri, 05 Feb 2016 14:03:23 -0800

Get your mind off winter and onto future gardening plans and learn how to build a cold frame on a budget, as well as learn successful growing techniques to ensure a bountiful harvest. Pre-registration is required. Contact Info. tags Shuylkill Center ...
Sanford Herald (registration)
Wed, 20 Jan 2016 01:22:30 -0800

... of the box is clear to allow in sunlight while the rest of the structure rests right on or buried a few inched into the soil, keeping the heat from escaping at night when the temperatures fall. The seedlings will be hardy since the cold frame is ...


Fri, 05 Feb 2016 10:33:45 -0800

This week's Plain Gardening episode take place in what's called a “cold frame” at Mobile Botanical Gardens. It's a sheltered enclosure that is meant to stay cold because that's what camellias like. Gardening expert Bill Finch says these camellias will ...


Tue, 12 Jan 2016 15:52:18 -0800

Question: What is the advantage of having a cold frame? Is it too late in the winter to start one? Answer: A cold frame allows you to extend the gardening season and enjoy fresh vegetables at times when others without a cold frame could not. A hotbed ...
Yankton Daily Press
Fri, 05 Feb 2016 13:45:00 -0800

Beth Preheim of Yankton is a veteran gardener who starts some seeds ahead for transplants. In the spring she plants them in the garden or in containers. This topic appears now as you plan how to start seeds for the new season. Some seeds she will plant ...
Thu, 04 Feb 2016 22:00:00 -0800

COLD FRAME CLASS, 11 a.m. to 12:30 p.m. Feb. 27, Terrace Room and Children's Garden, Myriad Botanical Gardens, 301 W Reno. Cold frames are a great way to extend the growing season since they act as mini-greenhouses. They're especially great for ...
The Daily Star-Journal
Fri, 05 Feb 2016 16:00:00 -0800

By mid-February, I'll be planting spinach and lettuce in the cold frame so there will be fresh greens by March. Going through all the tools and small equipment you put away last fall. Preventive maintenance will keep you from having to take your ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight