COLD FRAME
A cold frame is an enclosed ground bed, some time sunken bed, with a removable sash. Heat is provided through trapping of solar energy. The cold frame should be located in a sunny place and protected from cold winds.
Temperature is maintained during the day by removing the sash or cover or cladding material. Proper regulation of ventilation, shading and watering is the key success with the cold frame.
It is being inexpensive can be used in certain places of India where winter is severe. It can be used for raising early seedlings, rooted cuttings before they are transplanted in the field.