Wilt-Pruf Plant Protector, RTU Spray, 950mLWILT PRUF is a natural product derived from the resin of the pine tree, applied to plant leaves to reduce transpiration of moisture. When evergreens have been exposed to extreme drying conditions such as frozen roots in the winter or hot drying winds in drought stricken areas, they might not have enough moisture in their foliage to survive without help. Wilt Pruf gives them the added protection they need during these long severe periods of water