The opinions on when to clean up the holiday decorations
differ a lot.
Some people take them down immediately after
the Second Day of Christmas.
Other people just wait until all the needles have
fallen off their natural (dying) tree.
But when taking all the Christmas related holidays in
consideration and add up several practical reasons,
a good date seems to be January 6.
This is because it is exactly after the 12 days of Christmas,
we’ve done pretty much a full month of celebrating and
we cleaned up our acts mostly doing New Years Resolutions.

So now it is time to put your artificial tree back in storage
or release the natural tree back into the wild
or trash or burn the now dead natural tree.

Some regions collect the dead trees and burn them
in a final bonfire.
Other places silently dispose of those trees
who died for our holidays.
Farewell trees.
You were beautiful.

• https://www.holidailys.com/single-post/2016-1-6-national-take-down-the-christmas-tree-day