PROLONG CHRISTMAS TREE PRESERVATIVE Includes a pack of 12 Prolong Christmas Tree Preservative bottles. ProLong's special formula is an easy, effective way to keep Christmas trees fresher, greener and safer. This highly effective product. confirmed by university studies, is the easiest and most convenient method of hydrating your cut tree, thus keeping it greener fresher and safer throughout the holiday season. By keeping your tree watered with ProLong you will find the tree will retain their needles longer in the dry heat of your winter home. ProLong causes cut trees to absorb more water than it would otherwise, thus extending the life of the tree. ProLong is safe for use with children and pets, when used as directed.