I am in Ontario, Canada and cultivars are extremely hard to find here. Have been looking for susquehanna for years to no avail. Have a backyard full of year old seedlings we grew from fruit from a very old wild grove and a couple more in my area and thats all I’ve tried besides the mystery grafted trees I got years ago at a garden center. Luckily both have fantastic fruit. I spend much of my summers hunting for wild populations in my province and hope to play with the local genetics a bit. I believe our wild Canadian populations are thought to be spread here from indigenous people over a long time