Chen Kuanjian, a 64-year-old resident in Rugao, Nantong, East China's Jiangsu province started his business three years ago and now earns about 1 million yuan ($157,333.66) a year by selling brassica chinensis.

Chen now has 80 greenhouses that grow brassica chinensis, with each generating an income of 12,000 yuan per year.

Workers pick ripe brassica chinensis for selling in Chen Kuanjian's greenhouse. [Photo/WeChat account: rugaofabu]

Unlike other farms, Chen never hires temporary workers. The 18 staff he has get to work throughout the year and each of them are assigned specific roles.

Of the 80 greenhouses, two are used as experimental greenhouses. Whenever new varieties are introduced to the market, Chen will buy some seeds to see if they are suitable for growing in Rugao's soil.