Take the Chinese cabbage we eat:
The life cycle begins with the seeds of Chinese cabbage, grows in the middle, matures and finally dies. This is a life cycle.
Growth period means that the whole growth period of Chinese cabbage is divided into germination stage, seedling stage, clumping stage and heading stage. It focuses on the growth of Chinese cabbage.
Life cycle describes the stages that everything goes through, such as gestation, birth, growth, maturity and decline. The growth cycle only describes the birth to maturity of things in the process of growth.