No.
Hair is not a plant - it does not grow by its tip but from its root.
It is the hair follicle that determines the speed of growth. Once hair has grown out of the follicle (essentially grown out of the head) it is no longer "alive" and can not receive any nutrients from the follicle. Therefore, cutting the hair or its tips has no effect on this follicle (root) and cannot stimulate growth.
On the other hand, the tip of a hair is its oldest part. Since hair grows on average 1/3"-1/2" per month; over the years, they will have become damaged and damaged ends ruin the appearance of the whole head of hair. Cutting the tips of the hair can therefore give it a cleaner and more beautiful appearance. If, however, you are careful with your hair (using good hair care products with heat & environmental protection & reparative treatments) you may not need to cut your hair so often.
Here are my hair cut recommendations:
Very short styles (like buzz cuts) may need to be cleaned up every 2-3 weeks.
Short hair that will grow out and change shape quickly may need to be cut at 3-5 weeks (1/3"-1/2" of growth).
Medium styles from the ears to the nape may not need to be cut but every 8-10 weeks (2/3"-1 1/4" of growth.
Long styles (typically classified as shoulder length to 3" below) may not need to be cut until 12-14 weeks.
Very Long Hair: I don't suggest going any longer than 6 months without a hair cut. At 6 months, normal hair growth would be 2"-3" (trimming 1/2" would still allow for hair lengths to grow, while still looking healthy)
--Gina
