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You should aim for 40-75% humidity in your growing rooms when your illumination is on. high temperature and too much air flow can affect the relative humidity in a growing room. Generally, a high temperature lowers humidity - creating a poorer environment for plant growth.
This is a common problem in the summer, so additional moisture may need to be introduced via a mist or fogger system.
If humidity in your grow room drops very low (below 40%), it may cause the young leaves of your plants to become smaller; whilst, older leaves may curl at the margins, burn and drop off. It's important to note that such stresses tend to stunt plant growth. This is more apparent when plants are very young. Large, mature plants naturally raise humidity.
During the winter months, you are more likely to need a ventilation fan for de-humidification (retaining moisture) rather than reducing temperature. Grow room air is not exchanged as frequently in winter, so plants naturally raise humidity without air being exhausted.
However, too much humidity can create a perfect environment for fungal diseases and your plants are particularly vulnerable when you switch your lights off and the temperature drops because the humidity level rises. In fact, inadequate ventilation is the root cause of most fungal diseases.
Fungal spores thrive in a humid, stagnant environment, jeopardizing entire crops. Keep fresh air flowing, and bud rot can be a thing of the past!
Continually check the humidity level of your grow room with a hygrometer and use a mister when the humidity level in your grow room is too low also a ventilation fan helps to promote healthy growth by constantly replenishing air.
Hydroponic Fogger
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