Cold frames are an excellent way to start plant growing earlier in the season and extend it into late fall. They act like small greenhouses by providing a warmer and protected environment for the plants.
In Germany, the best time to use a cold frame is usually from February or March. It is advisable to sow frost-resistant vegetables such as spinach and radishes early. Heat-loving plants, such as tomatoes and peppers, should be planted later. Cold frames can come in different types and designs, which differ in material, size, shape and functionality.