China's flower resources are very rich, there are many exotic flowers and grass. For example, there are about 800 species of azalea in the world, while China has about 650 species. There are about 220 species of camellia in the world, and 195 species of camellia in China. Among nearly 500 primrose species, China accounts for about 390 species.China has vast territory, complex natural conditions, and diverse topography, climate and soil. In particular, Mesozoic and tertiary gymnosperms occurred and developed in a warm climate; Quaternary glaciation in China was not damaged by the north continental ice sheet, but only affected by mountain glaciers and climatic fluctuations, which basically maintained a relatively stable tertiary tropical climate. Because of these reasons, China's plant resources are very rich, and it is the largest center of the eight major origins of cultivated plants in the world. There are about 25,000 species of known flowering plants in China. Among some ancient communities that have long been extinct in other parts of the northern hemisphere, the ginkgo biloba, the silver fir, the white pine, the golden thread pine, the dove tree, and the fragrant tree are still preserved in China.China's flower resources flow into the world through a variety of channels, for the rich world of horticulture made a great contribution. After the 16th century, a large number of flower resources in China were introduced to foreign countries. After the introduction of flowers from Europe and America in China, the original appearance was quickly changed. Therefore, foreign flower resources collected in China are often called digging gold. The UK has introduced thousands of garden plants from China and played a major role in some special garden or wall garden, azalea garden, rose garden, peony peony garden and rock garden. In Europe, there was a saying that you could not have a garden without Chinese flowers and trees.Since 1899, there was a man named Henry ・ Wilson has 5 times to come to China to collect cultivated and wild flowers. For 18 years, he traveled to sichuan, hubei, yunnan, gansu, shaanxi and Taiwan, collecting 1,200 species of trees and shrubs and collecting 65,000 samples of waxleaf. In 1929, Wilson published in the United States his collection of records in China, called "China, the mother of gardens", since then, China has been known as the "mother of world gardens".It can be said that all the introduced plants in the country, have Chinese flowers. The germplasm resources of flowers introduced from abroad, some of which are directly applied to landscape greening, have made great contributions to the world's gardens. Some are used as the parents of flower hybridization breeding, which has played a great role in fundamentally transforming the original flowers, because there are many Chinese flowers and varieties with early flowers, four seasons blooming, aromatic, excellent characteristics, strong resistance and other characteristics.