The best method of propagating sugarcane is by stem cuttings. This involves cutting a healthy stem from a mature sugarcane plant and planting it in soil. The stem cutting will then develop its own root system and grow into a new plant. This method is preferred over seeding sowing because sugarcane seeds are not always readily available, and it takes a long time for them to grow into mature plants. Layering involves burying a portion of the plant stem to create a new plant, but this method is not as effective as stem cuttings. Grafting is not commonly used for sugarcane because it is a difficult process, and it is not very effective. In summary, stem cuttings are the best and most common method for propagating sugarcane because they are easy to perform and result in healthy new plants.