VENTILATION an average 10' x 10' foot vegetable garden will use from 10 to 30 gallons of water per week. Where does all this water go? It transpires and evaporates into the air. So basically, gallons of water will be held in the air. If this moisture is left in a small room, the leaves will get limp, transpiration will slow (remember the flow of water through the plant helps keep it erect) and the stomata will be stifled. This moisture mist be replaced with dry air that lets the stomata function properly. A vent fan that pulls air out of the grow room will do the job.
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