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George Wilson is correct. George Wilson is correct. Ailsa Craig and Kelsae are different varieties. Ailsa Craig is a variety that originated in Scotland in 1887. Kelsae is a variety that dates to some time around 1980. Johnson Seeds of Cambridge, England bought the plant patent for Kelsae in 1990 and still owns it. When Johnson got control of Kelsae other seed companies began to market Ailsa Craig as a substitute. The difference is Ailsa Craig usually averages 7 lbs. while Kelsae holds the Guiness World Record at over 15 lbs. Johnson’s uses the name Kelsae Exhibition, but the variety is also called Kelsae Giant, Kelsae Sweet, and Kelsae Sweet Giant and all are the same variety. There are no other strains.

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