Can elm be potted for one year after it is planted on the downhill pile?

Elm can be planted in a flowerpot by lifting its roots down the mountain within a year. When planting with downhill piles, it is necessary to plant with thick soil because it needs moisture and heat preservation. Roots can be taken in 2-3 months, and pots can be planted in one year. In order to prevent the stump from losing water, two-thirds of the stump can be covered with wet sand until the plants germinate. After the plants survive, the cultivated soil can be gradually reduced. In addition, plants can be covered with plastic film to reduce water loss. Never use clay and nutrient soil with high fertility.