A cold frame greenhouse in its simplest form is a box with a transparent lid or top. It was originally built to use beside a larger heated greenhouse on a farm. The term "cold frame" comes from the difference between the larger warm greenhouse and the much smaller unheated cold frame greenhouse. They were often placed at the foot of the larger greenhouse on the south side of the building. This allowed for maximum exposure to the sun, which was especially important during the colder months of winter and spring.
Originally the cold frame greenhouse construction was very simple. Its frame was made of wood and the transparent top was made of glass or some type of clear plastic. The top of the structure has a slope to it, allowing for sunlight to warm the inside of the structure, when the sun it not very high in the sky. The sloping top also helps drain-off rain water.
Because the air and ground inside of the greenhouse is warmer then the outside air and ground it is useful for extending the growing seasons of the plants placed inside it. Seedlings can be planted earlier in the spring, using the warmer confines of the greenhouse. Later in the season the seedlings can be removed and planted in the ground when the weather is warmer, the days are longer and there is no risk of frost. The structure also provides protection from strong winds, frost and unexpected snow falls.
Building a greenhouse of this type is very simple and can be done without much instruction. However there are kits available for purchase, if you need to go that route.
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