The custom may have pagan roots, but it fits perfectly with what the Scriptures say in the Psalm we hear at Christmas: "The trees of the wood will shout for joy before the Lord, for he comes to rule the earth. He will rule the world with justice."
In community we usually set up our Christmas Tree on the feast of the Immaculate Conception. That is, we aim for December 8. It always depends on what else is going on...usually a lot. Maybe we will set up the Chicago community tree when Sr. Helena and I return from the concerts.
What are your Christmas Tree customs?