Onions are the most widely cultivated allium species in the world, and they have been cultivated for over 5,000 years. Experts from archaeologists to botanists believe they originated in central Asia, although there is some evidence to suggest they first grew in the Middle East. In ancient times, they were transported through trade routes and grew wild, as well. As a vegetable, the onion has a lot of beneficial properties, and they are even used in hair care products.
Why not grow a source of this ancient plant ourselves in our garden or kitchen?
Green onions (and leeks) are some of the easiest vegetables to grow. They are capable of adapting to a variety of soils and unbelievably easy to grow in pots, on windowsills, or in a garden. Growing them from the seed is not a difficult task, but for those who don’t have seeds or don't want to grow them from scratch, there is a more convenient way to grow green onions year-round.
Buy green onions, as many as you like. I prefer organic because they are more hardy, but to each his own. Organic is worth the investment, since this will provide a permanent source of onions.
Cut off the stems. Cut them at least one inch above the roots. You may cut them higher if you wish—basically cut off the green part. The bottom root system is what you need.
Place them in water, roots down. This step is not necessary but helps hydrate the roots. Some will leave them in overnight or for a few days, but I just leave them in the water for approximately ten minutes.
Bury the onion stems halfway in the dirt. Make sure the roots are covered and surround with mulch. I like to use green alfalfa, but leaves or straw will do just fine.
Plain, healthy soil will work. It it not necessary to fertilize immediately. If you’re going to use fertilizer, do not use non-organic, as it dries up the rich material in the soil and shrivels the onions after one season. You may spread organic fertilizer in your patch or pot or use just use simple things like raw vegetable scraps, banana peels, or egg shells. Used coffee grounds are a great trick to use as well. If you happen to have a pet rabbit, you may use its droppings.
Water! You must water onions daily.
Harvest. You may harvest the leaves whenever you like, although many advise waiting until the leaves are at least eight inches long. Harvest when the leaves are long and green or are long enough to eat. Be sure to cut from the leaves and not the white stalk to keep a continuous growth cycle.
Examples of the onion's use as a food source or medicinal remedy can be found throughout history.