Cold Frame Greenhouse

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A cold frame greenhouse represents the most efficient and simplest form of greenhouse that is available to the personal or commercial gardener. The simplicity and efficiency of this structure rests in its reliance on the sun rather than an artificial heat source. The cold house has a clear covering for its roofing and possibly its walls that absorbs and then traps the heat of the sun in order that the sprouts inside stay at relatively safe temperatures throughout the evening and night.

This form of starter house can be made for little expense and can offer much additional space in which the novice or advance gardener can get the growing season started.

The name of this structure implies the difference between it and a more traditional and often larger, heated greenhouse. The cold frame is unheated but the transparent material used for the roofing enables the structure to limit heat escape due to convection that would normally occur through the night hours.

Traditionally these frames were used as supplements to larger houses and were often constructed against the southern wall of the main greenhouse. These devices are a common project for both the beginner and advanced gardner and are a perfect way to introduce children to the world of creating their own microclimate. The device also protects the plants against the elements and from animals and insect predators.

While there are now many kit versions and readymade versions available from commercial gardening stores the practice of using a cold frame has been in use as long as their has been agriculture. Traditionally old windows would serve as the roof of the device with a latch attached that could raise or lower the glass enclosure. This roof is commonly tilted so that it can absorb as much as the winter sun as possible. Building one of these is a fine project that is easy to do and of great value to both the garden and gardener.

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