Luftfeuchtigkeit
DerFredlFeslstarted grow question 9mo ago
Humidity topic.
During the dark phase, I sometimes reach 70% humidity. When should I do something about it?
Or should I not worry too much about it?
Solved
1 like
00110001001001111Oanswered grow question 9mo ago
anything above 65% is greater risk...
the 'right' rh depends on temperature, too. The resulting VPD is something to consider. There are VPD tables you can image search for and reference. Atmosphere temps are -2C warmer than the leaf surface temperature. If you don't have a infrared thermometer to take leaf temp, that's good enough... these numbers are grey areas.
exhausting to a different area that doesn't 'feed' the intake to the tent can help, as long as ambient RH% is not high. Otherwise, you need a dehumidifier.
Canopy size is part of the equation too. Smaller canopy = less transpiration and less moisture released into air.
if they are not fully grown, this will only get worse, so if you need a dehumidifier, sooner is better.
All_our_small_plantsanswered grow question 9mo ago
70% is only a problem when the plants are in flowering. It should be below 62%, the lower the better to avoid mold.
2 likes
Complain
I_T_C_R_W___GROWanswered grow question 9mo ago
If it's very dry/warm during the day, that's not a problem. Otherwise, you can place a frozen bottle in a bowl in the corner or in front of the exhaust outside the tent at night. Then you have a mini dehumidifier, as the dew water condenses at this new lowest dew point in the room and ends up in the bowl. It brings about 10%.
2 likes
Complain