how to get taller can be knew if we could know the control of secretions of the growth hormones. Because the growth hormone is affected by:

The way we sleep
We exercise
Take stress and tension
What diet we take / what is our nutrition level.

Three hormones are there who control all this how to grow taller are:

Somatostanin: it is a hypothalamic hormone, a peptide; several tissues are in the body which produces it.
GHRH: the growth hormone or releasing hormone is a stimulator of synthesis and secretions, its also hypothalamic and in response to it somatostatin , inhabits the GH .
Ghrelin is the hormone from stomach and a binder for the somatotrophs receptors simulating GH stimulation.
GH replies back to somatostanin when it inhabits GHRH and has an autocrine effect if inhabitation.The basic concentrations of GH in our blood is very less , but the extreme release of GH in youngsters is after the sleep. This gives the marvelous effect to how to grow taller if controlled.