You usuallly put it up 12 days before Christmas and leave it up for 12 days after. But you don't have to.
Christmas Eve
You should put your tree up either after Thanksgiving or a week before Christmas!!! It is actually your choice. TEEHEE (^-^) Your welcome!!!!!
You can put ornaments on a Christmas tree.
It's just a tradition, you are not required to put up a tree if you don't want to.
That would be December.
Traditionally it is the 23rd December, Christmas Eve.
It is typically best to put up a live Christmas tree a few weeks before Christmas, around the end of November or early December. This allows you to enjoy the tree throughout the holiday season without it drying out or shedding too much by Christmas Day.
Christmas time
on a Christmas day
So Santa can put persants underneth the christmas tree.
You should put it about the beginning or middle of December.
Americans put a Christmas tree up and put stockings up and put gifts under the tree