Onion is a pungent edible of the lily family. It is considered a food of exceptional value for flavoring and seasoning. The germination of onions is slow at 6 to 7º, the optimum germination temperature range is 10 to 35º, and the maximum temperature is 40º. There are two varieties of onion, white and red. They are now available in fresh, pickled, canned, caramelized, powdered, chopped, frozen, and dehydrated forms. Dehydrated onions, onion flakes, kibbled onion and onion powder are used for flavoring ketchups, sauces, even pickles. The fruit is a globular capsule. Leaves are long, linear and hollow. A bulb is formed by thickening of the leaf bases when the plant reaches a certain stage of growth.

Green Onion - Also called scallions. These small, young onions are harvested when their shoots are still green. They can be good chopped and used as decoration in soups, salads and other dishes

Vidalia onion -Also known as Yellow Granax . This onion is from Georgia that can be used in salad, soup, sliced and eaten on a sandwich instead of meat.

Red Onion - Also known as purple onions. These colorful onions are often used in salads and on the barbecue.  They can be cooked and added to other recipes.

Yellow Onion - have a brown skin and white flesh. Yellow onions are usually not very flavorful but they're used in soups and many different recipes. . Yellow onions are quite inexpensive.

Tree onion - Also known as Egyptian onion, top onions, walking onions or winter onions, Produce bulblets in the flower head, these onions are very strong flavored

Sweet onion - sweet onions have higher water content and much lower sulfur content

Benefits  of onions

Health benefits of Onion have the substantial cure from number of diseases such as Anaemia, common cold, asthma, bleeding piles, bacterial infections, respiratory problems, Jaundice, angina, and cough, sexual disorder etc. its dried cured bulbs may be kept for several months without deterioration and can stand rough handling. Good storage life is usually associated with high pungency.

Onion contents have the property to cure the following diseases:-

• Onion juice mixed with honey or olive oil is said to be best treatment for acne condition and glow skin.
• Onions are very good for the health of hair, finger and toe nails and even the eyes.
• Eating onions has also been linked with a decrease in risk for colon cancer and can help control blood sugar levels.
• Onions are increasing the urge for healthy sexual life. Onion increases libido and strengthens the reproductory organs.
• Onions help the body in destroying worms and other parasites.
• Onions are beneficial in the treatment of anaemia due to their contents.
• onions have the property of helping lower blood sugar, they are good for those suffering from diabetes
• Consuming equal mixture of onion juice and honey can relive sore throat and cough symptoms.
• Onion juice dipped on cotton or wool and put into ear is an ancient remedy for ringing sound in ears. If dropped hot into ear, it may give relief in earache.
• Onion good for reducing the risk of heart attack and stroke.

Onion is now cultivated in most parts of the world, including India.

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