Originally Posted by
KVB
In my opinion you guys are way to high unless you have great ventilation and even then you are too high.
We have found that this is strain specific. They really do react to the humidity differently. Take note of how temp and humidity interact. Obviously you know that warm air holds more water than cool air.
But operating at higher than 50% and close to 60% is unnecessary in any stage and the higher runs a risk of mold. You can do it, with good circulation and temp regulation, but you can seriously drop those humidity levels.
In early stages when roots aren't established you can kick the humidity up to 70% or more, it's how it gets water. Watch that temp though, keep it under 25C with lights on.
It changes in veg as the roots start taking on more water and the plant itself uses evaporation to cool. Lower the humidity about weekly through veg. You guys might take it to 50, but so many strains do better at lower. Take it to 40%.
With temps slightly higher here evap is good, stay under 27 or 28C
Keep dropping that shit for flowering. If you're not at 40%, get there, obvioulsy temp is dropping a bit for flowering too.
This is where I differ from you guys. About two weeks from cutting, maybe while flushing, I'm dropping humidity to 30% definitely less than 40%.
There are some plants that we are putting at 20% humidity in flower and those are about 40% during veg.
Keeping temp and RH down during the flowering period can be a bitch and getting the late stage lights on/off temp difference to increase with these lower levels of humidity are very important.
And a bitch to do sometimes. I think my thoughts on how it can be and is done is for another post though.