Cold frames are a type of gardening structure designed to protect plants from cold temperatures and adverse weather conditions. Synonyms for cold frames include plant protectors, mini greenhouses, plant shelters, seedling enclosures, and plant wardens. These structures are essential for extending the growing season by providing a warm and controlled environment for plants to thrive. Plant protectors can be constructed from a variety of materials, such as wood, metal, and plastic, and can be customized to suit the needs of specific plants. They are particularly useful for growing delicate plant species that are vulnerable to frost damage and require protection from harsh winter conditions.