The growth rate of a Christmas tree depends on several factors, including the species, climate, and overall health. On average, it takes 7-12 years for a Christmas tree to reach a height of 6 feet, which is the standard size for a holiday tree. The growth rate can vary between different species, with some varieties growing faster than others. Factors such as proper care, soil conditions, and protection from pests and diseases can also affect the rate of growth. Some Christmas tree farms may use a combination of different species to ensure a reliable supply of trees each year.