Leek is a perennial vegetable, which can be directly planted or transplanted, most of which are transplanted. Chinese chives like cold climate and are resistant to low temperature and frost, and the aboveground parts can tolerate low temperature of -4 ~-5℃. The suitable temperature for seed germination is 15 ~ 18℃, and the suitable temperature for stem and leaf growth is 12 ~ 24℃.

The sowing date of leek can be spring sowing and autumn sowing in the south (April ~ 10), spring sowing in the north, April sowing in North China and late April to May sowing in Northeast China. The emergence of leek seedlings is often irregular. In order to improve the germination rate of seeds, new seeds should be used when sowing, and seeds can be soaked to accelerate germination (soaking seeds for about 24 hours, accelerating germination at 15 ~ 20℃ for 2 ~ 3 days, and sowing can be carried out when the seeds turn white). The sowing amount is 6 ~ 7.5 kg/ha, and the bed soil should be kept moist after sowing, and the seedlings will emerge in about 7 ~ 8 days. After that, the management should weed the seedlings in time to ensure that the seedlings have a certain nutritional area. If you sow in the rainy season in the south and the bed soil is wet, you can sow with dry seeds without soaking and accelerate germination. When the seedlings grow to the height of 1.5 ~ 20 cm, it is a suitable period for planting.

Appendix 1000- Grain Weight and Life Span of Main Vegetable Seeds

1000-grain weight and longevity of main vegetable seeds