Row cover is a lightweight fabric used in gardening to protect plants from harsh weather conditions, pests, and diseases. It acts as a barrier, allowing sunlight and moisture to reach the plants while shielding them from frost and insects. Typically made from materials like polypropylene, row covers come in various thicknesses, providing different levels of protection. Gardeners often use them in the spring and fall to extend the growing season, ensuring that delicate seedlings and crops thrive despite temperature fluctuations.