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.
Norfolk Island Pine - The Other Living Christmas Tree. Norfolk Island Pines make great tabletop trees for offices, apartments or anywhere space does not allow a larger tree. When people think of living Christmas trees they often think about small, container-grown evergreens that are brought indoors around Christmas.