Remember, if you buy a tree from someplace warm, say Brussel's which is near Memphis, if you live somewhere cold, like Fargo, Minnesota or north of Chicago, you will not be able to just plop your purchase outside, in the middle of January. The tree will need a month of steadily decreasing night temperatures to adapt.
In fact at this point in winter I'd be tempted to just keep it indoors until safe to put outside in spring. The complexity of acclimating stock to cold is why I don't purchase trees after September. Buying trees or rather taking delivery only April thru August.
Procumbens juniper, if given all of the autumn to adapt, are perfectly hardy through zone 5, meaning most of the USA they can be left outside all winter.
But things are pretty green in Memphis and southward, not a good time of year to move trees to a Michigan or northern Illinois or Minnesota back yard.
Curiously procumbens in warm climates, like Florida and southern California, does reasonably well, with minimal winter chill. This is the reason it is often used for "box store bonsai" which often ends up indoors for long periods. It also stays green for months after it has died. This making time of death difficult to detect, and by extension, cause of death this gets obscured. Less blow back to originators.
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