Christmas trees are grown for various purposes, and the growth rate can vary depending on factors such as the tree species, growing conditions, and cultivation practices. Typically, Christmas trees take 6-10 years to reach their full height, with some varieties growing faster than others. The most commonly grown Christmas trees in the United States are Douglas firs and spruces, which can reach 6-8 feet in height within 8-10 years. Other species, such as Norway spruce and white pine, can grow faster, reaching heights of 8-10 feet within 6-8 years.