Our Cortland is supposed to be an M7 tree, just like the Macoun you might’ve seen in another thread. I got both of them from a nursery in Wisconsin, and they said they’re M7. @alan saw the burr knots on my Macoun, and said he’s seen that more on M111. So, which knows what RS the Cortland has.
It’s been in the ground two years and seems to be doing alright, although it hasn’t grown as much as the Macoun, which really took off last year. The C doesn’t have as thick branches as the M. But, it does have more branches on the lower part of the trunk unlike the M.
Maybe @alan could comment on the tendencies of Cortland. The variety was developed in NY, and is widely grown there.