The apple is a hardy, deciduous woody perennial tree that grows in cold temperate zones. Apples grow best where there is cold in winter, moderate summer temperatures, and medium to high humidity. Apples are moderately fast growing, but growth slows with age. Apple trees can live for 100 years or more. Apple trees bloom in the spring, set fruit, and take from 100 to 200 days to reach harvest depending upon the variety. An apple a day keeps the docter away!