How big of a factor is the room humidity?

Chrisuperfly

Chrisuperfly

Well-Known Member
Good Morning everyone. My current grow set-up temp is usually a rock solid 80 degrees during the day and ~70 degrees at night but my humidity is never above 25-30% at any given time. How much of a factor will this play in overall growth? I have been thinking about adding a small mist humidifier to raise the humidity to around 50%. Any help would be appreciated.

Oh, by the way, the dimensions of my room are 3 feet deep and 4.5' wide. I have 8 plants going right now in a soil medium.
 
the widowman

the widowman

Well-Known Member
it should'nt matter although high humidity during veg is preferred. but a low humidity must maintained for a bud to form so no higher than 30% during flowering or as low as possable.
 
shamegame

shamegame

Well-Known Member
the widowman said:
it should'nt matter although high humidity during veg is preferred. but a low humidity must maintained for a bud to form so no higher than 30% during flowering or as low as possable.
Click to expand...
What are you talking about? I have grown many a bud in all kinds of humidity- 30,50,80% - dosen't matter ?
 
M

mdgtptrl

Well-Known Member
The resin, thc, acts as an insulator for the plant to keep water from evaporating from the plant. As such, in a room with low humidity, the plant produces more thc during flowering. High humidity can also give you mold, i think.
 
the widowman

the widowman

Well-Known Member
somebodys been changing my posts again man cause thats not my post iam looking at. i rememmber looking through it before i posted man so somebodys out to get me again. it'l be the dealers making sure everyones growing ditchweed. and by the way high humidity during flowering risks all sorts of problems. :joint::mrgreen:
 
rezo

rezo

Well-Known Member
high humidity can act as a perfect enviorment for mold or should i say ......powder mildew
 
4

420bugmenot

New Member
there's some decent advice in here

Greenhouse conditions for veg, low humidity above the root line for flowering will give you the stickiest yummy stuff
 
tahoe58

tahoe58

Well-Known Member
my RH was between 25-35% for the entire grow, and seems to have worked well for my plants....so far.....cheers!
 
Serotonin

Serotonin

Well-Known Member
I always read that temps around 80 and higher with low humidity is bad since the plant restricts the stoma to save H2O... thus leading to a decline in CO2 which obviously will fuck your buds up.

I have around 40-50% in flowering and my buds are sexy. :O

edit: I would be interested in some empirical evidence of low humidity improving resin production if anyone has it... links to a study perhaps. Typically plants will have waxy cuticles to survive in low humidity but from my understanding the role of cannabis resin is different from that. Especially since most transpiration takes place out of the fanleaves and not the buds and the amount of resin is minimal to non-existent on fanleaves as opposed to buds.

Honestly though, cannabis has grown naturally for millenia in various climates.
 
I

infamouse21

Well-Known Member
i would also bet stagnant air will be a big factor for mold ect.. our humidity is around 65% we are on week 2 flower so will be u know how it goes so far things are looking sweet
 
scias

scias

Well-Known Member
right, low humid for flowering preferred and high humid (50-60%) for veg. too high (70%+) encourages mold. too low slows root developement
 
Chrisuperfly

Chrisuperfly

Well-Known Member
I purchased a small mist humidifier and have it in very close proximity to the grow set-up. The Humidity is now ~45-55%. I have not noticed a difference as of yet but, it has only been a little over a day since I started it up. Will post results.
 
Chrisuperfly

Chrisuperfly

Well-Known Member
Well I have to say this past week was definitely an eye-opener. With the Humidity ~45% during the day and 50% at night I have seen a jump in growth that leads me to believe the humidity plays a very large role. The plants have almost doubled in size. So thumbs up to the higher humidity.
 
H

home grown 420

Active Member
im in the same boat, mines usually around 35 sometimes 38 and sometimes lower. ive been considering a humidifier but i havent noticed any problems .
 
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