In Liaoning, Hebei, Shanxi, southwestern Shaanxi, Shandong, Henan, Beijing, Tianjin, Jinan, northern Jiangsu, Anhui and Hubei, the frost-free period lasts for more than 200 days. The climate is characterized by mild spring, abundant sunshine and less rainfall, but it is hot and rainy in summer, cool in autumn and the temperature drops rapidly. In this area, cucumber cultivated in the open field includes spring stubble (early stubble) and summer stubble (common stubble), and spring stubble cucumber is the main cultivation form. Generally, the seedlings are raised 35-40 days before first frost, and then planted after first frost. After cucumber cultivation, it grows vigorously in spring, bears good flowers and fruits, comes on the market early and has high yield.
Autumn cucumbers are generally planted directly or raised in the open field 3-4 months before the local first frost, and harvested about 50 days after sowing. In order to accurately determine the sowing date and planting date of cucumber in various regions, we can refer to the frost period and the above principles.
Hubei, Hunan, Jiangxi, Zhejiang, Shanghai, Anhui, southern Jiangsu and northern Fujian in the middle and lower reaches of the Yangtze River have warm and humid climates and long frost-free periods. Three crops of cucumber can be planted in the open field a year, that is, spring, summer and autumn. In Hainan, Guangdong, Guangxi, Taiwan Province and Hongkong, as well as the southern areas of Fujian and Yunnan, there is plenty of rainfall, which is warm all the year round and frost-free.