1, illumination: Elm is a positive tree species, which likes light, and it is necessary to ensure sufficient sunshine every day during the growing period; 2. Pruning dead branches, diseased branches and weak branches regularly during the growth period of elm can promote the growth of new branches; 3. Change pots regularly: when cultivating elms, change the pot soil every two years, and choose loose and breathable soil for replacement, so that the roots of elms can grow better; 4. Fertilization: The formed elm pile needs to be fertilized 2-3 times a year.

About Yushu

Elm: also known as spring elm and white elm. , commonly known as "elm knot", is a deciduous tree of Ulmaceae, with smooth bark of young trees, grayish brown or light gray, dark gray bark of big trees, irregular deep longitudinal cracks and rough epidermis; Branchlets glabrous or hairy, without swollen cork layer and raised cork wings; Winter buds are nearly spherical or ovoid. Leaves are oval, oval, etc. The leaves are smooth and hairless, the back of the leaves is pubescent when they are young, then they become hairless or some veins have tufted hairs, and the petiole surface is pubescent. The leaves of flowers bloom first and cluster in the axils of branches. Samara sparsely obovate, rounded.

Distribution range of elm

Elms are distributed in northeast, north, northwest and southwest provinces of China. Cultivated in the lower reaches of the Yangtze River. Korea, the former Soviet Union and Mongolia are also distributed.