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.
Chalk Maple. Chalk, or Chalkbark, maple (Acer leucoderme) is another variation of the sugar maple that is grown in the South (USDA zones 5 through 8). It is a smaller tree, reaching 25 to 30 feet tall and 15 to 30 feet wide, making it a good choice for patios and decks.outhern sugar maple (Acer barbatum) is often used as a substitute for sugar maple (Acer saccharum) in the South. This heat-tolerant, deciduous tree grows in U.S. Department of Agriculture plant zones 7 through 9.