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.
4. Decide what kind of plant you want to end up with for Christmas. If a small bushy plant is your goal, the entire plant should be trimmed down to about inches above the main trunk. If you want a larger plant, simply pinch the tops of each main branch and continue this until about July.