I am in zone 5
Have had these for a few years now
It doesn't seem to matter if you prune or not I have done both
I get some die back on some canes and then prune, I have noticed a few more shoots when I do prune, but no real difference in fruit production.
I have gotten several new plants from root runners . I let them grow the first year and then cut them to 12-18 inches and transplant the second year.
