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Correct humidity is often overlooked when managing the growing environment as its very easy to become focused purely on temperature control. This is a mistake though as correctly managed humidity can massively improve plant health and growth rates whilst also preventing common problems such as over transpiration. In fact, during the vegetative growth stage, it is best to try and maintain a relative humidity of between 50-70%. your plants will thrive at these humidity levels and the impact on your final crops will be noticeable if you can keep the humidity optimal throughout your grow.