Cover crops are plants grown primarily to improve soil health rather than for harvest. They are typically planted during the off-season when main crops are not being cultivated. These crops help prevent soil erosion, enhance soil structure, and increase organic matter, which can lead to better water retention and nutrient availability. Common types of cover crops include clover, rye, and vetch. By planting these crops, farmers can suppress weeds, reduce pests, and promote biodiversity in the soil. Additionally, cover crops can help fix nitrogen in the soil, making it more fertile for future planting of main crops.