Elm generally means auspicious and rich, and elm is also called "Yuqian" tree, which means that there is "surplus money" every year.

Elm (scientific name: Ulmus pumilaL.): Also known as spring elm and white elm, it is known as "elm knot", and it is a deciduous tree of Ulmus family, with smooth bark of young trees, grayish brown or light gray, dark gray skin of big trees, irregular deep longitudinal crack and rough skin; Branchlets are glabrous or hairy, without swollen cork layer and raised cork wings; Winter buds are nearly spherical or ovoid. The 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 flower leaves open first and clusters in the axils of the branches. Samara is sparsely obovate and round. The flowering and fruiting period is from March to June (later in Northeast China).