When is it suitable to grow onions?

Generally, it can be planted in September-65438+10, and can be planted when the temperature reaches 15-25 degrees Celsius.

Introduction to onion:

I. Introduction:

Onion (scientific name: AlliumFistulosuml. var。 Giganteummakion) is a kind of onion, which is divided into four kinds: ordinary onion, chopped onion, chive and chopped onion. Scallion is pungent, slightly warm, and has the function of venting yang; The function of detoxification and seasoning.

Mainly used for colds, aversion to cold and fever, headache and nasal congestion, abdominal pain due to yin cold, dysentery and diarrhea, internal resistance of insects, milk obstruction and unfavorable defecation. Onion contains volatile oil, mainly allicin, and also contains diene sulfide and calcium oxalate. In addition, it also contains fat, sugar, carotene, vitamins B, C, nicotinic acid, calcium, magnesium, iron and so on.

It is a perennial herb with cylindrical leaves, hollow middle, fragile and easy to fold, and blue. Onion is often eaten as a very common spice or vegetable in East Asian countries and Chinese areas around the world, and plays an important role in oriental cooking. People in China are used to chopping onions and ginger together, frying them in an oil pan until golden (commonly known as "frying" or "frying pan"), and then frying other vegetables in the pan.

Second, the edible value:

1, can dissipate heat, and scallion oil can eliminate phlegm.

2, eating onions can also stimulate the secretion of human digestive juice, enhance digestion, and make people more appetizing.

3, eating onions can enhance the resistance to bacterial viruses, especially to skin fungi.

4, anti-cancer has a good effect, and the allicin contained is also an anti-cancer substance.

5, used to treat colds, dizziness and nasal congestion.

6, onions contain vitamins A and C, which can prevent human cholesterol from being too high. .