Though the so-called Christmas Tree Syndrome doesn't bother everyone, airborne allergens expert, Max Wiseberg, has some top tips for those who are susceptible. Hose down your tree. Check with the nursery where you purchase your tree if they have a washing service, and if not, consider doing this at home with a garden hose. Allow the tree to dry before bringing it inside."Hose down your tree before taking it into the house, or after getting it out of storage, as this can help remove some of the mould and sporesâ€Ļ