A greenhouse is a structure with transparent walls and roof designed to provide a controlled environment for plants to grow throughout the year. It is usually heated and can accommodate a wider variety of plants compared to a cold frame.
On the other hand, a cold frame is a simple, unheated structure with a transparent cover that helps extend the growing season by protecting plants from frost and harsh weather conditions. Cold frames are typically used in early spring or late fall to provide a slightly warmer environment for plants compared to the outside temperature.
