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Fir Tree Types and Facts on the Fir Tree Species Fir trees are tall, symmetrical evergreen trees with pyramidal forms and flattish green needles which tend to be soft to the touch. They generally prefer cool, moist soil and cool temperatures and perform poorly in wet, poorly drained soils. Leaves of white fir are often attacked by spruce budworm and Douglas-fir tussock moth. Bark beetles may also be a serious problem in some areas. As a Christmas tree, white fir has good foliage color, a pleasing natural shape and aroma, and good needle retention. Range: White fir has one of the largest ranges of any of the commercial western firs. Douglas-fir tree details. Information about Douglas-fir leaves, twigs, buds, flowers, fruit, bark, wood, and landscape uses of Douglas-fir trees. Pictures of Douglas-fir are included. The term fir trees has at least three separate and distinct meanings. First of all, fir trees in scientific terminology refers to the 40 species of the genus Abies. The pine family, of which the firs are members, contains 11 general in all and has 210 species. Second of all, fir trees is commonly used by lay people to refer to any coniferous ...Jun 15, 2017 · Facts and History of Fir Needle Essential Oil. The fir (Abies) tree has a genus of 48 to 56 different species of symmetrical evergreen coniferous trees that belong to the pine family (Pinaceae). Fir needle essential oil is made from fir needles—the flat, soft, needle-like leaves of a fir tree. Fir needle oil will often come from the fir ... Seven species of true fir are native to western North America, and Oregon has six--more than any other state: grand fir, Pacific silver fir, noble fir, California red fir, subalpine fir, and white fir. All true firs have the following characteristics: Interesting Facts About Trees. Trees are the longest living organisms on the planet and one of the earth’s greatest natural resources. They keep our air supply clean, reduce noise pollution, improve water quality, help prevent erosion, provide food and building materials, create shade, and help make our landscapes look beautiful.