Willow trees are trees of the willow genus in the willow family. Branches are cylindrical in shape, with a nearly circular pith; No apical buds, lateral buds usually adhere closely to the branch, and bud scales are single; Leaves alternate, sparsely opposite, usually narrow and long, often lanceolate, feather veins, serrated or entire, petiole short, with supporting leaves, often serrated; The inflorescence of the hibiscus is upright or obliquely spread, with the bracts covering the entire edge, and the pistil composed of two carpels; The capsule is split into two petals; The seeds are small and often dark brown in color. The flowering period is from February to March, and the fruiting period is from March to April. The name of willow tree comes from its head wood working method. The result of the head tree homework is to preserve the trunk for continuous use of the branches, and the pronunciation of the word "willow" is the same as that of "liu", hence the name "willow tree".

Salix elaeagnos, also known as bitter willow, olive willow, gray white willow or desert willow, is a flowering plant that grows in Central, Southern and Southwest Asia. It is an upright shrub that can grow up to 3 meters tall and 5 meters wide, with narrow gray green leaves that can grow up to 20 centimeters long. It turns yellow in autumn. In spring, green male inflorescences appear together with leaves, and the male inflorescences have yellow anthers. Like all willow trees, this species is dioecious.

Black poplar is a deciduous tree with a height of 30 meters; The tree crown is wide oval shaped. The bark is dark gray and cracks when old. Branches round, light yellow, hairless. The bud is ovate in shape, rich in mucilage, reddish brown in color, and the tip of the flower bud is curved outward. The flowering period is from April to May, and the fruiting period is in June. Black poplar naturally grows on riverbanks and river bays, and is rarely found on coastal sand dunes. Often formed into strips or patches of forest. Cold resistant, light loving, not tolerant to salt and alkali, not tolerant to drought, grows well on alluvial sandy soil. Produced in Xinjiang, China, it is distributed in northern China and northern Asia. The black poplar has a cylindrical crown, with a tall and upright tree shape and a graceful posture; Can be planted in clusters or rows on lawns, squares, schools, hospitals, and other places.

Willow trees are trees of the willow genus in the willow family. Branches are cylindrical in shape, with a nearly circular pith; No apical buds, lateral buds usually adhere closely to the branch, and bud scales are single; Leaves alternate, sparsely opposite, usually narrow and long, often lanceolate, feather veins, serrated or entire, petiole short, with supporting leaves, often serrated; The inflorescence of the hibiscus is upright or obliquely spread, with the bracts covering the entire edge, and the pistil composed of two carpels; The capsule is split into two petals; The seeds are small and often dark brown in color. The flowering period is from February to March, and the fruiting period is from March to April. The name of willow tree comes from its head wood working method. The result of the head tree homework is to preserve the trunk for continuous use of the branches, and the pronunciation of the word "willow" is the same as that of "liu", hence the name "willow tree".