100 day. Originally developed in 1887 by David Murray, gardener to the Marquis de Ailsa, Ailsa Craig is a wonderful onion. They are medium sized, and full of rich onion flavor. They aren't good keepers, but are well worth growing for fresh use. Unlike a lot of sweet onions, they caramelize with a rich and full onion flavor. Long Day.
Minimum of 250 seeds per packet.