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The original form of a cloche is a bell-shaped glass cover that is placed over an individual plant; modern cloches are usually made from plastic. The use of cloches is traced back to market gardens in 19th century France , where entire fields of plants would be protected with cloches.
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.
Row covers can reduce the drying effect of wind, and can provide a small amount of warming in a similar way to unheated cold frames, greenhouses and polytunnels, creating a microclimate for the plants. The first commercial-scale use of polyethylene row covers in the US was in the 1950s, and by the 1980s their use was widespread. [1]
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The abundances of plant species are often measured by plant cover, which is the relative area covered by different plant species in a small plot. Plant cover is not biased by the size and distributions of individuals, and is an important and often measured characteristic of the composition of plant communities .
If you don’t have the time or funds to buy a cover before a deep freeze, Tuscaloosa Emergency Management Agency suggests a quick DIY method involving rags or t-shirts, plastic bags, and tape.
The cover material is vapour permeable to prevent unwanted condensation from destroying transparency and to discourage the growth of mildew, fungus and bacteria. However, bags have been patented for protecting the fruit, vegetables and small plants by Kollath and Huffman (2000). [ 22 ]
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