Willow is a Salix plant in Salicaceae, which is a general term for Salix, Salix and Salix. There are about 520 species in the world, mainly distributed in temperate regions of the northern hemisphere, followed by cold regions, few in tropical regions and southern hemisphere, and no wild species in Oceania.

Willow is a kind of plant with ecological amplitude, which has wide adaptability to the environment. Like light, wet and cold, it is a medium-sized wet tree species. However, some species are also more drought-tolerant and salt-tolerant, and can grow in places with poor ecological conditions, and grow better in plain areas with superior site conditions. The average life span is 20 ~ 30 years, and a few varieties can reach 100 years or more. The annual growth period is long, with early germination and late defoliation, and individual tree species in the south are evergreen trees.

Strong cold resistance, no freezing injury under the conditions of annual average temperature of 2 degrees Celsius and absolute minimum temperature of MINUS 39 degrees Celsius. I like moist and well-drained sandy loam, which can be planted in floodplains, ravines and low wetlands. The survival rate of afforestation in dry ridges and sand dunes is low, and plants are easy to die or grow into small old trees. In clay and low-waterlogged wetlands, it is easy to rot roots and die. It can grow on mild saline-alkali soil with salt content of 0.3%.

Willow is a very common tree species, which can be seen almost everywhere in daily life. As the saying goes, "if you have a heart, you can't plant flowers." Willow represents exuberant vitality-it can grow from a humble branch into a towering tree without deliberate care and only by providing one side of soil. Every spring, willow is the first tree to sprout and turn green. Willow can be seen almost anywhere in the country, town, south or north: by the river, by the roadside, in front of and behind the house, willow has strong adaptability to the environment. Wicker is the most flexible branch. It moves with the wind, not demanding, let nature take its course.

Therefore, willow is mainly used for garden viewing, residential areas, gardens, schools, factories, hillsides, courtyards, roadsides and buildings. When in full bloom, the branches spread out to the willows, making the courtyard full of green with high ornamental value; It is an ideal tree species to beautify the courtyard.