Bearded dragons typically grow an average of one to a few inches each month for the first year of their life. While some bearded dragons can grow up to 2 feet in length, the maximum size of these animals in captivity is limited by the size of their environment. Bearded dragons achieve sexual maturity between one and two years of age.
Once bearded dragons have achieved sexual maturity, they mate in the Australian spring and summer months. Captive bearded dragons are often kept as pets and do not share the seasonal mating habits of animals in the wild. Bearded dragons that have grown to adulthood are territorial, and they establish and maintain social hierarchies that are based on aggression and appeasement.