Yes, as others said, your hair grows from the root. However, if it grows an inch in a month, and u have split and damaged ends, then ur hair is going to split UPwards and keep getting damaged further up the strand, causing ur hair to suck and break off and not maintain the length that it grew. If u get even just a dusting every once in awhile, or a trim every 6 weeks, thats whats best for your hair. My hair grows super slow, but lets say it grew an inch every month.....if I get a trim every 6 weeks, then in 12 weeks, my hair will have grown 3 inches, and if im only getting a quarter of an inch trimmed off, then I still have a total of: 2 1/2 inches of new growth that u KEEP, because ur hair is healthy and not splitting upwards.
Wow, Im not even good at math lol