Transplanting of winter vegetable seedlings involves lifting seedlings from the nursery and planting them in the main field to provide better growing conditions. Some key crops transplanted include tomatoes, cabbage, and brinjal. Transplanting provides benefits like healthier stockier plants, uniformity, and better land use. However, it also involves greater expenses and the risk of transplant shock. Seedlings should be hardened off before transplanting through methods like limiting water and exposing them to sun. The ideal time for transplanting is early morning or late evening and seedlings should be at the 4-6 week stage with a good root system.