Most everyone knows that we use proteins, carbohydrates and fats for energy. Calories are measurement of a unit of heat or food energy. For example, we can achieve four calories per gram of proteins and carbohydrates, and nine calories per gram from fats.
Tree Variety. Virginia pine (Pinus virginia) is the major Christmas tree species for the acidic soils found in East Texas. A grower can produce a 6- to 8-foot Virginia pine Christmas tree in 3 to 5 years, depending on soil and climatic conditions.
Among the most popular types of Pine trees are: 1  Scotch Pine: Commonly found in North America where it is commercially grown as a Christmas tree, the Scotch Pine is known for its beautiful bluish-green needles and full shape. 2  Ponderosa Pine: Popular among landscapers, the large Ponderosa can grow up to 80 feet tall. Needles: Instead of traditional leaves, Pine trees feature needles that are thin and pointed. 2  Individual needles range in length from one inch to up to six inches. 3  The needles typically grow in clusters and are traditionally dark green in color, though some trees feature green needles with a light blue tint.