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Winter onions require special care before frost arrives. Proper protection ensures a rich harvest, while incorrect methods can lead to crop loss. Mulching is beneficial in cold regions, protecting the soil and young plants. The best time to cover onions is when the soil begins to freeze, preventing premature growth in spring. Recommended materials include dry straw, fallen leaves, and pine needles, while fresh sawdust and wet leaves should be avoided. Agrofiber can also be used for added protection. Common mistakes include mulching too early and using wet materials, which can promote diseases.