Hair grows from the scalp (from a root in the bottom of the follicle). So, contrary to a popular belief, cutting your hair does not affect your hair growth. But trimming the hair helps to remove and prevent split ends.
The split ends can hinder hair growth, since the hair breaks easier. To have a long and beautiful hair, it’s important to take care of the hair ends while the hair is growing.
Together with trimming the hair (it doesn’t need to be every month), applying hair products in the hair ends regularly can also help significantly to prevent split ends, since many ingredients Inside Hair Products help to protect the hair from damage.