How to Grow Ailsa Craig Onions

  1. Choose high-quality heritage or heirloom seeds they are often preferred for their superior taste and hardiness.
  2. Pick a sunny spot with full sun, but they can tolerate some shade. Ensure the soil is well-draining and rich in organic matter.
  3. Plant the seeds directly into the soil, approximately 1cm (0.4 inches) deep and 10cm (4 inches) apart. If planting in rows, space them 30-45cm (12-18 inches) apart.
  4. Water regularly to keep the soil moist but not waterlogged.  Water deeply once a week, or more often if the weather is particularly hot or dry.
  5. When raising seedlings, thin the seedlings once they emerge emerge, to give them more room to grow. Space them 5-7.5cm (2-3 inches) apart.
  6. Fertiliser is not required with Ailsa Craig Onions, but a balanced fertiliser can help promote growth. Apply a slow-release fertiliser once a month.
  7. Harvest Ailsa Craig Onions when the tops begin to yellow and fall over. Lift them out of the ground using a garden fork or shovel.

Heritage of Ailsa Craig Onions

The heritage of Ailsa Craig Onions can be traced back to the Scottish island of Ailsa Craig, were the production of granite is used to make curling stones for the sport of curling.  The onions were first cultivated in the 1800s and have since become a popular variety around the world.  Prized for their flavour and size which can weigh in at 0.9kg (2 pounds), their unique shape is due to the growing conditions on the rocky Island of Ailsa Craig.  Their high sugar content is what makes them so sweet and easy to eat raw. One of the first vegetable crops to be grown in greenhouses on a large scale, with production beginning in the 19th century.  Today, Ailsa Craig Onions are still grown in Scotland, as well as in other countries such as the United States and New Zealand. With these simple tips, you can easily grow your own crop in your garden or in containers on your balcony or patio. Enjoy the taste of fresh, homegrown Ailsa Craig onions all year round!
Plant Height 45 - 60 cm (18 - 24 inches)
Season of Interest Summer
Temperature Range 10 - 20°C (50 - 68°F)
Annual / Perennial / Biennial Biennial
Frost Hardy / Tender Hardy
Full Sun / Part Sun / Shade Full Sun
Sow Direct / Raise Seedlings Raise seedlings
Seed Preparation No special preparation required
Sowing Depth 1 cm (0.4 inches)
Plant Spacing 10 - 15 cm (4 - 6 inches)
Row Spacing 30 - 45 cm (12 - 18 inches)
Watering Regular watering. Do not let soil dry out
Good Companion Plants Carrots, Beetroot, Lettuce, Chamomile, Parsley, Rosemary, Thyme
Bad Companion Plants Beans, Peas, Brassicas (such as cabbage, broccoli, and cauliflower), Corn
Pests Onion fly, Thrips, Onion maggot, Cutworms
Diseases Fusarium basal rot, Botrytis leaf blight, Downy mildew, Pink root, White rot

ONION-AILSA CRAIG

$3.20

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When I started this journey in 2009, I found nothing existed commercially, that was reasonably priced and easy to use. There was a homemade system which I also found was not that user-friendly.

Then a friend of mine told me about a homemade method she used. However, when I tried her method, I found this also didn't suit my needs, as it too had flaws that I considered where important. It did not keep vermin out, did not have a lockable lid and (to me) looked unsightly in the garden.