Winter cover refers to plants or crops that are grown during the winter months to protect and improve soil health. These plants, often called cover crops, help prevent soil erosion, suppress weeds, and enhance soil fertility by adding organic matter when they decompose. Common winter cover crops include rye, clover, and vetch. Farmers and gardeners use winter cover to maintain soil structure and prevent nutrient loss during the cold season. By planting these crops, they can also promote biodiversity and create habitats for beneficial organisms. Overall, winter cover plays a crucial role in sustainable agriculture practices.