I just read your article from June regarding planting a cut Christmas tree. The article says you can't ... Nonetheless, my tree is over a month old now and it has not browned. Moreover, in the last week, it started sprouting all over with new growth ... How is this possible?
Replanting a Cut Christmas Tree
Certified GKH Gardening Expert
The new vegetation you are seeing is coming from buds that grew on the tree before it was cut. This article explains why it happens:
Unfortunately, the tree won't be able to grow outdoors, because it will eventually exhaust its resources and won't be able to grow new roots.