Plant Base Online (beta)
© Deeproot Plant Base
common name: Onion
dry soil, moist soil
preferred soil pH: neutral-alkaline
minimum temp: -18°C
USDA zone: 3 to 10
The cultivated edible onion, a variable perennial or biennial usually now seen as the many named cultivars. Cylindrical, hollow greyish-green leaves produced from a large fleshy bulb. Rounded umbels of numerous, small greenish-white flowers in late summer. Strongly aromatic.
There are many named varieties grown.
Well drained, fertile soil in full sun. May be grown from seed or more often from immature bulbs, known as "sets", usually planted out in spring. Bulbs are ready to crop when the foliage begins to wither, and should be allowed to dry to enable storage over a long period.
From seed or bulb offsets.
Grown world-wide as a very important vegetable. Also long used as a medicinal remedy for cold, coughs, stomach problems, high blood pressure and other purposes.
Probably originating from Asia, but as it has been cultivated for so long, its occurance in the wild is now not certain.