Despite the promise of grow tents being controlled environments, many indoor growers have a tough time maintaining appropriate humidity levels from day to day. During plants’ vegging cycle, in which they grow to their ideal height, a 35-50% humidity is ideal. During their flowering cycle, which is their reproductive stage, the humidity should be lowered to between 30% and 40%. Here are a few cheap or free ways to add humidity to your grow tent.

Humidification Through Evaporation

You don’t need anything fancy to add humidity to a grow tent. You may not even need to anything at all. For instance, by turning down the exhaust fan to its lowest level, you can minimize the moisture that finds its way out of the tent. One small addition that can result in a big change, though at a slow rate, is placing a pair of open jars filled with water inside the tent. The slow rate is due to the low intensity of CFL, MH or LED grow lighting used inside the tent, but that slowness is useful for keeping the humidity at a stable level. A final low-tech solution is to add in more plants, whose foliage creates moisture naturally.

Simple Gadgets for Adding Humidity

Even the fancy stuff you can buy for increasing humidity is pretty basic. A one-gallon household mist humidifier (around $40 for an ultrasonic model) would be too underpowered for a full grow room, but for a tent that’s only a few cubic feet, it does the job perfectly—and with no increase in temperature. Another simple accessory that you can repurpose for humidification is a seedling heat mat. These are meant to heat soil, but they can also be used to warm a tray of water. Heat mats are dirt cheap: you can find models online for as low at $10.

Too Much Humidity

Some home growers discussing grow tents in online forums advocate rather high humidity levels—sometimes 55 to 70%. Anything over 50% should be avoided, since it will encourage the grow of mold and interfere it the carbon filter’s proper functioning. It’s easy enough to reduce excessive humidity with simple changes in ventilation, so it’s generally better to err by not having enough humidity than by having too much.

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