The Onion - Allium cepa

Growing instructions

Onions can be grown from seed but are more frequently grown from sets- the name given to small onion bulbs sold for planting. Sets are preferred as the onions grow more quickly and are less likely to be attacked by pests and diseases.

If growing from seed: Sow in 1 cm deep rows, 20 cm apart, from late February to early April. Remove weaker seedlings to leave onions growing 10 cm apart.

If growing from sets: Plant sets 10 cm apart from mid-March to mid-April. Push into the soil until just the tip is showing.

Onions grow best in open ground.

Remove flower spikes as soon as you see them. Stop watering once the onion bulbs have swollen and remove any soil to expose the bulbs to the sun.

Harvest when the foliage turns yellow and droops over. If kept in a cool, dry dark place onions can stay fresh throughout the winter.