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Is high humidity really a bad thing?

T

theroadwarrior

Member
I am running two rooms. One has ac and dehumidifier. The other is fan cooled with dehumidifer.​

The fans run almost continually to cool the room during lights on. I turned the dehumidifier off during lights on because it was running the entire time the fans were on to keep up with the 70% humidity in the air. It really had no effect other than producing loads of water. I turn it back on during lights off and maintain 45-50%.​

I guess my question would be is it ok that my room is 70% humidity lights on? I know it seems like a no-no but my outdoor plants are in the exact same humidity and they do just fine. Why is it that high humidity indoors is so bad and outdoors it seems to be ok? And I am using the same clones for inside and outside so its not genetics.​

My friend says outdoor plants get so much breeze and natural airflow it stirs the air around the plants. Not sure if I buy it but does seem to make sense. My fan cooled girls seem to be as happy as both the outdoor and ac room so I am crossing my fingers for now. The room does have a pretty good breeze and the air is well circulated.

Hoping someone can give me some clarity. Thanks
 
G

Guest 150314

Besides mould, lower RH in flower will speed up flowering. I can't say why but I notice the plants closest to my dehumidifier ripen faster.
 
I

In~Plain~Site

70% is ok in veg, but it's definitely high for flower.I swear that by keeping my humidity right @ 45-50% helped me eliminate a mite issue.PM loves high RH as well.

I agree with the poster above, more than a couple of variables, I think the headaches you'll surely avoid are worth it.It's hit or miss as you have it now.

More air flow at the very least,if lowering RH isn't an option...we just went through it here few weeks back.

GL
 
J

Jdizzel

Member
If u hav TON ofi would say maby But if ur air movement is just ok or above average i m gonna say ur just asking for MOLD. Keep the RH down during bloom,
 
poindexterous

poindexterous

Member
What I've noticed over many rounds is:

80% humidity: bud rot very likely in all but most resistant strains.
70% humidity: bud rot rare but may strike a few larger buds.
60% humidity: never had bud rot once in anything.

Another major factor that most people don't realize is the horrible accuracy of most humidity gauges, both dial and electronic. Most hygrometers will be 10% off and easily up to 30% off or worse. best way to know for sure is to get a sling psychrometer, they are accurate and not very expensive, though not as convenient as looking at a hygrometer. I use a high end dial hygrometer and calibrate it with the sling psychrometer monthly, and hygrometer does drift without calibration.

A friend just had bud rot who's new electronic gauge read 60%, I checked it with the sling and it was over 80%. So be weary of humidity gauges.
 
V

vdog

I cant help you directly but I can say that on the opposite end of the spectrum..... 24% rh in the desert is where Im at. So you have to be very careful how long you let things hang dry, we hang dry 1 day for every 10% in humidity, and with smaller, lighter, less dense buds (autos outdoors) we only hang for 2 days before putting into jars. Thicker, denser stuff goes 3 days of hang dry in the desert, but remember, no matter your humidity, you can always cure out moisture from a jar, but when they get to dry to quick its no good to have to add moisture in the beginning of the curing process if you let them hang dry to long. Again, I apologize, I realize this is opposite of your problem as I just wanted to throw it out there.
 
L

london

New member
i had high humidity in a grow years ago all seeds come from the same pack the plants in room a looked completly different from room b room b being high humidity the bud was stringy looked more like tai weed than skunk (strain was White Rhino) so i would say yes high humidity is a no no
 
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