and repeat, along with keeping them in the dark during the day, as cool as possible. You can also use the melatonin, shag, grow-n-shine or one of the other products that promotes hair growth. (you really need a minimum of 90 days to get the full benefits from these products.
No matter where they're kept (cooler, barn), the work required to grow hair is the same. Rinse, condition, brush till your arm feels like its gonna fall off and then some more.