A Christmas tree is an invitation for disaster for any cat. Several scat mats may work in discouraging your cat/s from going near the tree, but this solution can be costly and there is no guarantee
that the scat mats will work.
If you cannot put your christmas tree in a room that can be closed off to the cat/s, you will have to take several precautions.
There is no easy solution to keeping your cat/s away from a christmas tree, aside from spraying the end of the branches with anti-chew spray, you just have to be very watchful of your cat/s around this time of year.