Ideal humidity for flowering?
- Thread starter The Hippy
- Start date
TheRealDman
Well-Known Member
Humidity levels depend on temps..dial in your VPD (Vapor Pressure Deficit). Typically, the higher your temps, the higher your humidity should be. The gold fields on the chart are optimal ranges for Cannabis.
The Hippy
Well-Known Member
What are the numbers on the chart itself? What did I miss here?
zoic
Well-Known Member
From my observations the humidity tends to level off at 40-50 when I switch to 12/12. I expect it would depend on many things like hot much heat your lights chuck, how big your space, how much air flow etc.. I have had a few occasions when the humidity was 70%, so I just open the tent for awhile to let some air our, LOL
GreenHighlander
Well-Known Member
I run 40-50% in flowering depending on time of year. Sometimes in winter it will even be closer to 30% with lights on. Lights off it stays around 60-70% at most.
I will say they prefer higher humidity in veg, but I am ok with running lower humidity in flowering.
Cheers
I will say they prefer higher humidity in veg, but I am ok with running lower humidity in flowering.
Cheers
HotKarl2
Well-Known Member
Took a look at that chart. At 29c my humidity should be 75-80%? Can you say bud rot and mildew? I've gotten bud rot indoors at 60% humidity and 80-90F (27-32C). I'd say that chart is a bit off.
My duhumidifier keeps my room at 50% during flower to avoid bud rot especially on large dense colas.
The Hippy
Well-Known Member
I felt it seemed like too much humidity as well. The chart seems to favor TOO humid imo. But I never claim to be an expert....unless it's hating on the LP's...then I'm a pro.
I agree Karl....70% seems to high to me????
HotKarl2
Well-Known Member
I still don't understand the numbers in the middle of the chart. I must be blasted or stupid or both.
I think that must be the humidity at/in the canopy and not in the room. Keep your ROOM at 50% and your canopy will be higher.
The Hippy
Well-Known Member
sounds good until someone says better...where are you located Karl?
natureboygrower
Well-Known Member
from what i understand,and a different chart ive read somewhere,you drop humidity the further into your flowering weeks.weeks 1-2 humidity is stupid high(not any buds formed),3-4 its a little lower,and so on.i had a humidifier in my cab at one point to try and match that chart but stopped.i moved indoors to avoid rot.I still don't understand the numbers in the middle of the chart. I must be blasted or stupid or both.
HotKarl2
Well-Known Member
Depends Karl moves around a lot. Central Ontario sounds good.
HotKarl2
Well-Known Member
Yep that is totally true. Reduce humidity especially towards the end of the cycle or you will get rot. Rot sucks. And watch your canopy humidity. Packed colas have much higher chance of rot.
The Hippy
Well-Known Member
Ya me too.....I just wait for the tractor to hook onto my trailer and see where they leave me.
Actually I'm in the KW cities.
TheRealDman
Well-Known Member
I still don't understand the numbers in the middle of the chart. I must be blasted or stupid or both.
The gold fields are ranges of ok (7.5), to optimal (10.5).
Do your plants pray towards the light? If so, chances are your VPD is on point.
Budrot indoors is a result of high humidity, with a lack of adequate air movement...IMO.
The Hippy
Well-Known Member
Range of what? 7.5 what?
MichiganMedGrower
Well-Known Member
This chart is actually for Greenhouse agricultural crops. People started posting it a while back on weed sites and now it’s ideal for cannabis?
I keep my room at 50-60% rh max to avoid mold. And 75-77 degrees Fahrenheit for best potency and terpenes.
Too dry causes excessive transpiration.