Is green onion harvested with cold dew or first frost?

Green onions are harvested at the first frost.

There is a folk saying that "onions are not harvested in the first frost, and the longer they grow, the more hollow they become", because when the harvest is late, the nutrients supplied by onions will shift downwards, resulting in the loss of water in the upper part, softening and hardening, thus reducing the market value and causing considerable economic losses to onion farmers.

Characteristics of green onions:

Roots: the roots are white and string-shaped, and the lateral roots are few and short. The number, length and thickness of roots increase with the total number of leaves. In the vigorous growth period, the number of green onions can reach more than 100.

Stem: The stem is extremely short, spherical or oblate, solitary or clustered, with a thickness of 1~2cm, white skin, membranous and unbroken. Multilayer tubular leaf sheaths are attached to the upper part, and fibrous roots are densely distributed in the lower part. When the growth point of the seedling tip differentiates into flower buds, a flower stem will gradually develop. Welsh onion stems are stout, hollow and unbranched, 30 ~ 50 cm long.

Leaves: Leaves consist of leaf body and leaf sheath. The leaves are long and conical, hollow, green or dark green. The monocotyledonous sheath is cylindrical. Multilayer nested leaf sheaths and 4-6 unsheathed young leaves wrapped in them form rod-shaped pseudostems.