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.
Scotch pine trees (Pinus sylvestris) are native to Europe and parts of Asia. Also called the Scots pine, these trees are commonly grown as Christmas trees. They are desirable for their cold hardiness and adaptability to environmental conditions.However, they are susceptible to a number of insect pests and diseases.lso called the Scots pine, these trees are commonly grown as Christmas trees. They are desirable for their cold hardiness and adaptability to environmental conditions. However, they are susceptible to a number of insect pests and diseases.