I can tell you this. Grant's Seedless sweetgum is a tree that was growing on my late husband's uncle William Grant's property in Willmette, Il. outside of Chicago, and identified in the 1990's as being a distinct type of a tree which should only grow in the southern US. Not only that, it is unique in that it does not have the stupid seed pods that cling to everything that our southern ones have. After they got it to breed true, it received a plant patent and went into cultivation for sale. Whether or not it will grow in Canada I cannot say.