Sorry to bring back a really old post. Anyways, I air layered the "little white" in the black pot a couple of times and then left it for dead (its the one with lots of RKN in the earlier pic) in the same spot, uncovered. Another little sprout, about pencil thick, came up in the fall but I just left it. Its been down to 6 degrees this year and below 20 on numerous occasions. When I visited it today, I was shocked to see it still alive - only dead at the very top.
I should of saved myself the trouble the in ground tree got...