Ok im sure there is more of a reason than that
theres a lot more.
pot grows best when humidity is 40 to 60% as with temp,consistant humidity promotes healthy even growth.
relative humidity level affects the transpiration rate of the stomata.
when the humidity is high,water evaporates slowly.the stomta close,transperation slows and so dose plant growth.
water evaporates quickly into dryer air causing stomata to open,increasing transpiration,fluid flow and growth
transpiration in arid conditions will be rapid only if there is enough water avalible for the roots to draw in.
if the water is inadequate,stomata will close to protect the plant from dehydration,causing growth to slow