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A picture of a Onion 'Ailsa Craig'

Onion 'Ailsa Craig'

Allium cepa 'Ailsa Craig'

Full Sun
Easy care
Light watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








6 months to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has a strong fragrance

More images of Onion 'Ailsa Craig'

A photo of Onion 'Ailsa Craig'
A photo of Onion 'Ailsa Craig'

Common problems with Onion 'Ailsa Craig'

Onion 'Ailsa Craig' Companion Plants

Carrots, strawberries, lettuce, beetroot, cabbage, sweet peppers, spinach, tomatoes

How to harvest Onion 'Ailsa Craig'

When the tops turn yellow and "wilt", it is time to harvest; usually between 100 and 120 days after planting. Gently lift the bulbs before the foliage has fully died back, place the whole plant on racks with good ventilation in full sun to dry out for 2 weeks before being stored in a cool dry location.

How to propagate Onion 'Ailsa Craig'


Plant onion sets 10cm from mid-March to mid-April. Plant the bulb in the soil with just the tip showing, and firm the soil around them. Birds can be a problem, pulling new sets from the ground so cover with a fleece until firmly rooted.


Direct sowing in late autumn in a well-prepared bed and thin out later. Will require about 9 to 12 hours of daylight to stimulate bulb formation.

Special features of Onion 'Ailsa Craig'

Attracts bees

Only when in flower which is in its second year of growth.

Crop rotation

Grow in beds which were used for potatoes the year before to help reduce the build up of pests and diseases.

Repels harmful insects

The juice is used as a moth repellent. Rubbed into the skin it acts as an insect repellant.

Pot plant

Can be grown in raised beds and deep containers in full sun.

Other uses of Onion 'Ailsa Craig'


When eaten raw, onions benefit the health in many ways, i.e. anti-inflammatory, antiseptic, prevents tooth decay. The juice is a first-aid treatment for bee stings and quickens healing of wounds.


Although the bulbs are probably the base ingredient of the vast majority of cooked dishes the world over, the flowers are also edible.