I may have had a graft which failed to take. But I haven’t lost any Nikita Gifts. I have lost plenty of others though.
This year, I have a grafted root sucker from a Tam Kam which has been sending up a lot of suckers after being heavily damaged for the two winters before last winter. The NG graft grew pretty well and I wasn’t planning on protecting it- I was hoping that it would be fully hardy around here and I could transplant it to a rental.
If I protect anything, it would be a non-astringent, like Tam Kam. Last year it only got down to about 0, which TK can take without issue, so I may just take my chances.
I did see this product last week at Home Depot and immediately thought of persimmons…They have a 6 and 12’ version as well…
Maybe it would damage the tree by being too hot? Maybe the solution would be to insulate the trunk with the foam tubes used for pipes, then wrap the heating wire around it? But then you would be losing most of the heat- maybe it would be better to run the wire up the crack in the foam, so that it is halfway between the tree and the outside.
You could use a temperature control to power it, with the sensor inside the foam to turn on the wire when it goes under 10F. If I do something like that (which I’m leaning against), I would probably only need to run it for 1-2 nights. As there is often only a brief dip in Jan or Feb which does all the damage.