Alfalfa is an annual or perennial herb in the genus Medicago, which is widely distributed in Eurasia. In Europe, except for the coldest areas at high latitudes, it is distributed almost all over Europe; In Asia, it is mainly distributed in West Asia (Iran, Afghanistan, Pakistan, etc.), Central Asia, Russia (Siberia), Mongolia, China, North Korea, Japan and India. It is distributed in China from temperate zone to subtropical zone and to Qinghai-Tibet Plateau. Born in cool and humid river banks, roadsides, fields, forest margins and grasslands; Meadows in grassland belts often become companion species.

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