Evergreen trees in nature, firs are tall, symmetrical trees with uniformly spaced branch whorls. Large cones are held erect. Most native firs are high mountain plants which grow best in or near their natural environment. The Fir Balsam incense is a strong refreshing smell of the high country. Hold the brick over a flame until the brick burns by itself. After the brick has stopped flaming, gently blow on the ember. Place the brick in the center of lid unlit side down.