Flocking for Christmas trees is a decorative technique that involves spraying or dusting a powder onto the tree branches to give them a snow-like appearance. The powder is usually made from ground-up foam particles and can be used to enhance the look of any artificial Christmas tree. Flocking can also be used on real trees, but it is more commonly used on artificial trees due to its permanence. In addition to giving the tree a more realistic appearance, flocking can also help to mask imperfections or uneven branches.