[cmrdporcupine]

If they're not grafted varieties, it can take 10 years to get any fruit at all. And it's recommended to get multiple different types for pollination to be more successful.

Recommended for Ontario: https://www.grimonut.com/ (NoTL area)

Bare root seedlings that you'd plant in the spring. Though it is not clear to me if what they're selling are grafted or not, I've never been 100%.

[fl4regun]

the ones I have are from https://onplants.ca/shop/asimina-triloba/ They claim to be grown from seed and so should be viable for producing fruit (as long as you have multiple plants). We will see in multiple years time how they do. The ones on the site you linked seem to be grown from seed as well, and seem to offer 100-180cm sized seedlings, I'm guessing those are 2 maybe 3 years old, mine are much smaller, about 50cms. Probably a better place to purchase from if you don't want to wait so long to mature them!