The genus Alium contains the widely cultivated food crop known commonly as onion. As well as a wide range of the ornamental onions grown for summer displays. Onions are an easy to grow vegetable crop in the colder seasons because of their hardiness. They can also be grown in any soil type as long as it is well-draining and they receive a lot of sun. These are great vegetables for beginner gardeners as they do not require a lot of maintenance. Onions are most frequently a biennial or a perennial plants but they usually treated as an annual and harvested in its first growing season for the swollen, edible onion bulb. Onion plants produce chemicals called volatiles which repel harmful insects from other plants and can be used to create a natural insecticide spray when paired with cayenne pepper/red pepper and garlic.
Summer, Winter, Spring
Bulbing usually takes place after 12 to 18 weeks. The bulbs can be gathered when needed to eat fresh, but if they will be kept in storage, they should be harvested after the leaves have died back naturally. In dry weather, they can be left on the surface
Seeds are thinly sown directly at least 5 cm apart, in rows 30 cm apart. Onion sets are produced by sowing seed thickly in poor soil and the small bulbs produced are harvested and planted the following spring and grow into large bulbs
Repels harmful insects
Onions repel harmful insects from other plants
Onions are light feeders, so crops should be rotated annually.
The onion is believed to have originated in Asia, though it is likely that onions may have been growing wild on every continent.
Soil PH preference
They are good for the heart and keep cholesterol in check
The bulb is edible, either cooked or raw.
Onions suffer from onion fly, stem and bulb eelworm, thrips, onion maggots, white rot, and neck rot. Diseases affecting the foliage include rust and smut, downy mildew, and white tip disease.