Hi Joeturbo,
In my Zone7, they all go dormant with the winter. All my trees are in ground - except some tests I'm playing with for this year.
Last year, I put on the ninja suit, to get some root-shoots in an abandoned garden . That was in June or July.
The two small trees grew - they had 3 or 4 small roots to start with - well nothing serious.
In Fall, they went dormant and I protected them - look for my winter protection post .
This year, the bigger one is growing good. The smaller one did come back from under the ground - amazingly that last one had more roots but ok, a thinner stem... go figure ...
They are in an eighty liters ( yes one more) trashcan bottom less but in ground - for rodent protection. In the same spot, I planted 2 "Dalmatie" root shoots .
They are growing good too. I already had to pinch the toughest one.
So as the winter comes, let the cuttings go dormant. They can handle it down to Zone7... as long as you protect them a bit .