A friend of mine asked me to propagate this Hydrangea and I did so successfully. It was a Hydrangea his mother, a founding member of our local Garden Club in the 1920's - 1930's, had put in the family garden and was still doing well. In researching for more info about Hydrangea 'Ayesha', I did come across several websites that offer the cultivar for retail sale ($9.99 for 4 inch pot being the least expensive, and on up in price, depending on pot size).
My friend recalled his mom referring to the Hydrangea as "Prince William." The American Hydrangea Society experts said they had never heard of a Hydrangea with that name. Anyone here know where the "Prince William" name may have come from???
Here are 4 reputable sources: http://davesgarden.com/products/ps/go/49166/ No guarantees any of them have it in stock at this point in the season, but if you look earlier in the spring next year I'm sure one of them will have it then. Also not sure about shipping to Canada but hopefully at least one of them can.