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.
Despite this, nearly 50% of all Christmas trees grown in Oregon are Noble fir. Grand fir (Abies grandis) is the third most common Christmas species in Oregon, accounting for about 10% of the annual production. This tree is a true fir, like noble fir, but it is cultured or shaped like Douglas-fir.ouglas-fir (Psuedotsuga menziesii), Oregon's state tree, has historically been the primary tree species grown for Christmas trees in the Pacific Northwest. About one-half of all trees produced annually are Douglas-fir. This tree takes 5 to 7 years to bring it to market.