When was bluegrass introduced to my country?

Also known as bluegrass: June grass, longleaf grass, prairie berry, light stem bluegrass; scientific name: Poa.pratensis.L.; English name: Kentucky.bluegrass, Smooth.meadon.grass, Smooth-stalked.

Grassland bluegrass is a plant of the Poa genus (Poa.L.) in the family Poaceae. In 1753, C. Linnaeus named this plant collected from natural grasslands in Europe Poa.pratensis.L., and J.R. Edmondson (1980) named P.pinegensis.Roshev. and P. P.turfosa.Litv. is also included in bluegrass. In Europe it is called Smooth.mendow.grass. This plant is naturally found in cool, moist grasslands in Europe, Asia and North Africa. In Europe, it is distributed almost throughout Europe except for the Balearic Islands in the Mediterranean; in Asia, it is distributed in Central Asia, China, Mongolia, Japan and Russia's Siberia and the Far East; it is also naturally distributed in the Mediterranean coastal countries in northern Africa. This is an important and fine grass in natural grasslands. In North America, this plant is also found throughout the United States and Canada. Therefore, early scholars believed that bluegrass was a wild species naturally distributed in the United States. It has been found that the bluegrass in North America originated from Europe and was introduced from Europe. Before 1700, European wild bluegrass seeds were brought to the Atlantic coast by immigrants, traders or missionaries. Kentucky was the first state to cultivate bluegrass, forming a large area of ??excellent pasture land and further recognizing the benefits of this grass. The value of cultivation and utilization is promoted to other states for cultivation through seed production and dissemination. Therefore, it is also called Kentucky bluegrass in North America. The United States should be the origin of cultivated bluegrass, and later spread from the United States to Oceania and Asia. Our country was first introduced from the United States in 1923, and cultivation experiments were conducted in Northeast China (Gongzhuling, Tieling, Liaoyang, etc.).

Now, Poa annua has become a world-famous fine cultivated grass species. It was originally used as grass species to establish artificial grazing lands and mowing grasslands, and then developed into lawn grass species and soil and water conservation plants for ecological construction of urban and rural green spaces. In the 20th century, countries around the world have bred a large number of excellent cultivated varieties for different purposes and adapted to different ecological and geographical conditions. It is commonly grown in some countries in North America (United States, Canada) and Europe (Netherlands, Denmark, Sweden, Germany, etc.); it is also grown in some countries in Oceania, South America and Asia. Among them, the United States has the largest planting area, with more than 16.5 million square hectares used for forage and 4 million square hectares used as lawn. The seed production of bluegrass in the United States has also developed rapidly. Before 1897, all commercial bluegrass seeds were produced in eastern Kentucky; after 1932, the seed production in the north-central (Iowa, Minnesota, etc.) greatly exceeded Kentucky; In the late 1940s, seed production in the northwest (Oregon, Washington, etc.) rose rapidly. By the 1970s, bluegrass seed production accounted for 86.4% of the entire United States. At the same time, Canada, Denmark, the Netherlands and Germany also produce and export seeds in large quantities. Since the 1980s, my country has also imported a large amount of bluegrass seeds from abroad, mainly for lawn construction. With economic development and social progress, the planting area of ??bluegrass will also become larger and larger.