Goober69

I was never able to put the pots on the ground or bury them (renting...couldnt disturb the grounds) so what I did was put the pots in tubs. The kind you buy at Home Depot to mix cement in. In the bottom of the tub I had coiled out a heating cable that I bought at a garden center. This cable is used in planters and seeding pots to keep them from freezing. If the temperature falls below 35 degrees it turns on.
So, coil on bottom, pots above and then I take mulch ( I have used pine bark, cedar and evan sand) and fill in the gaps between the pots and cover the tops about an inch or so. This keeps the roots from freezing which I had always thought would kill the trees.
I have used this technique for about 5 years now. Trees I have used it on are maples, pines, mamosas a dawn redwood and a few others that I cant think of off the top of my head. Never had a fatality. However, you do have to water them because the heat will dry the soil in the pots out.

Like I said, I was never able to put them on the ground or bury the pots in a flower bed or anything so this seemed like an ok option.

Any opinions?

By the way, sorry for taking so long to respond...with the move ahead, I dont have much time to get online nowadays.

Thanks for your responses.

Tony