Vegetables: repair them from the cold: Generalities
There are many possible solutions. Recently the use of the c.d. has been very widespread. non-woven fabric, a very light and cheap synthetic fiber material to be placed directly on the vegetables to be protected. Being a breathable material it is able to avoid condensation inside and to let rain water pass. Under the protective layer the temperature is generally a couple of degrees higher than the outside, and is ideal for protecting crops from the first frosts.
For greater protection it is instead preferable to set up tunnel greenhouses, which can be easily constructed with metal arches and transparent plastic sheets. To prevent rot, it is advisable to ventilate the greenhouse during the hot hours of the day.