While humidity is good for the growth of marijuana plants to some extent, having too much humidity would mean you risk rupturing certain cells and portions of your plants because they will have more water than they could carry! Having high humidity also makes it harder to have the nutrients travel up the plant’s body via the roots because most of the moisture the plant needs, it gets from the environment. If the humidity was low, then the plant would rely on the roots and therefore absorb the nutrients along with the moisture.