Ailsa Craig

Onion

95d to harvest

Sweet, golden bulbs with a gentle bite—Ailsa Craig brings a luminous, honeyed flavor and a beautifully crisp yet tender texture to the garden. The classic Yellow Onion form develops firm, well-filled layers that roast to a melting softness and shine in fresh salads, slow-simmered sauces, and quick pickling for a bright, balanced tang. Grow it for reliable, home-garden performance and that unmistakably refined “Ailsa” sweetness at harvest.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 4th
Transplant / Sow Outdoors	Apr 27th
Harvest Begins	Jul 31st
Harvest Ends	Oct 5th

Crop Details

Trait	Value
Days to Maturity	95
Sun Requirements	Full Sun
Growth Habit	Bulbing
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	Not Required

Recommended Companions

Jeanette Carrot

Golden Acre Cabbage

Romulus Lettuce

Flashy Trout Back Lettuce

Atomic Red Carrot

Flat Dutch Giant Cabbage

Frequently Asked Questions

Ailsa Craig tomato plants keep getting brown, concentric rings on lower leaves—what disease is it and how do I stop it?

Brown concentric rings on older, lower leaves of Ailsa Craig tomatoes are classic for early blight (Alternaria). Remove and destroy infected leaves immediately, then spray with a labeled fungicide for tomato early blight and repeat according to the label (especially after rain/dew). Keep foliage as dry as possible by watering at the soil line and spacing plants so air moves through the canopy.

When is Ailsa Craig ready to harvest, and what signs should I look for?

Harvest when fruits are fully colored (a deep, uniform red) and reach their typical large “heirloom” size—Ailsa Craig usually matures in about 95 days. Pick fruits when they come off the vine with a gentle twist and the skin is firm but gives slightly under light pressure. If frost threatens, harvest even slightly less-red fruit and let them ripen indoors at warm room temperature.