When onion crop is grown for bulbs some premature seed stalks are produced before completing the normal life cycle of the onion bulbs known as ‘bolting’. These bulbs become fibrous and light in weight. The leaves and bulbs become unfit for consumption.

Under this condition bulbs become light and fibrous and show very poor keeping quality. A seed stalk will form very quickly and appear to bolt up. These flower stalks or seed stems can form in the first year if appropriate environmental conditions occur and plant size are favorable.