Finishing Flower Humidity

[ZookieBoy]

Last few weeks of flower. What is everyone’s rh range ? Do you use vpd? Do you use a humidifier during lights on if it gets low? Or just as dry as possible ? During lights on the humidifier kicks on pretty frequently I don’t want that to effect trichomes or cause any other issues but I also don’t want it super dry causing problems in that sense. Also rh is higher lights off which I don’t like. Any help or input would be appreciated

 

[PadawanWarrior]

Try not to make multiple threads about the same thing.

 

[calvin.m16]

Day/Night VPD keeping kPa between 1.2-1.6 is key.

VPD Chart

Vapor pressure deficit (VPD) chart & calculator for horticulture in controlled environment. Cannabis, tomatoes, leafy greens, cucumber.

vpdchart.com

 

[ZookieBoy]

Last few weeks of flower. What is everyone’s rh range ? Do you use vpd? Do you use a humidifier during lights on if it gets low? Or just as dry as possible ?

Try not to make multiple threads about the same thing.

lol I asked a similar question in someone else’s thread and it was about other topics.. so wanted to make one that was just about the last week or two and rh

 

[70's natureboy]

I get very nervous at 60%. I was just feeling my lower branches today and was shocked how damp they were. That is definitely too humid. I didn't even look at the gauge I just turned down the dehumidifier and added another fan down low. I wouldn't worry about too dry unless it was under 40%

 

[Billy the Mountain]

VPD is not applicable during dark time; the stomata are closed and the plant is not transpiring.

60% RH is a reasonable limit assuming ample air movement

 

[NanoGadget]

I grow mostly indica/indica dominant plants with dense, chunky colas. 45% or lower for the last 3 to 4 weeks for me. fuck bud rot.

 

[calvin.m16]

VPD is not applicable during dark time; the stomata are closed and the plant is not transpiring.

60% RH is a reasonable limit assuming ample air movement

They are mostly closed to my understanding, they expel oxygen still right? If anything my nighttime humidity is lower than my daytime to be on the safe side. I'd rather run cooler temps lower humidity than higher temps more humidity. I haven't switched to LED yet in bloom though so my situation is different than most people.

 

[Star Dog]

They are mostly closed to my understanding, they expel oxygen still right? If anything my nighttime humidity is lower than my daytime to be on the safe side. I'd rather run cooler temps lower humidity than higher temps more humidity. I haven't switched to LED yet in bloom though so my situation is different than most people.

They do expell moisture and keep consuming nutrient during the dark period, obviously not so much without light but the plants are still actively growing during the night.