99% RH & High Temps

BlueDieselDog

BlueDieselDog

Well-Known Member
Alright troops.
I am currently on my first 100% indoor grow. My 4 ladies, Durban Poison fems @msln, have been in flower for 30 days under 800w led floodlights (1x500w + 1x300w bright white) I started from seed & vegged for 60 days. I am growing in soil which I put together with what I could get my hands on & guessed amounts. Inc. Potting soil, vermicompost, peat moss, bat guano, perlite & vermiculite, dolomite lime, azomite, rock phosphate, bone meal, calcium nitrate & magnesium sulphate. Growing is in 5 gal cloth pots.
At present RH in the early morning is 99% with Temps of 80f on average. The RH drops to around 78% in the afternoon with max Temps around 90f to 95f.
I have a 12" extractor fan at the top of 1 wall to drag hot air out. Also have a 10" wall fan dragging air in from a shaded area at the bottom of another wall (switched off from 6pm until 1pm the following day). For air circulation I have 2 x 8" oscillating fans from 2 directions.
Girls look very healthy & have been daily pruning a bit to help with air circulation & also lollipopped all 4 for the same reason.
Feed when soil is very dry with 3-9-9 @ pH from 6.4 to 6.8, always RO water. Foliar feed very lightly now & again.

My question is: Has anyone out there had success with such high temps & rh%?
 

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growingforfun

Well-Known Member
BlueDieselDog said:
Alright troops.
I am currently on my first 100% indoor grow. My 4 ladies, Durban Poison fems @msln, have been in flower for 30 days under 800w led floodlights (1x500w + 1x300w bright white) I started from seed & vegged for 60 days. I am growing in soil which I put together with what I could get my hands on & guessed amounts. Inc. Potting soil, vermicompost, peat moss, bat guano, perlite & vermiculite, dolomite lime, azomite, rock phosphate, bone meal, calcium nitrate & magnesium sulphate. Growing is in 5 gal cloth pots.
At present RH in the early morning is 99% with Temps of 80f on average. The RH drops to around 78% in the afternoon with max Temps around 90f to 95f.
I have a 12" extractor fan at the top of 1 wall to drag hot air out. Also have a 10" wall fan dragging air in from a shaded area at the bottom of another wall (switched off from 6pm until 1pm the following day). For air circulation I have 2 x 8" oscillating fans from 2 directions.
Girls look very healthy & have been daily pruning a bit to help with air circulation & also lollipopped all 4 for the same reason.
Feed when soil is very dry with 3-9-9 @ pH from 6.4 to 6.8, always RO water. Foliar feed very lightly now & again.

My question is: Has anyone out there had success with such high temps & rh%?
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While it's possible you'll manage to escape this without losing a lot to budrot at harvest, I wouldn't bet on it. I'd put your odds under 1% that at harvest you wont lose a fair bit to mold. A lot of times you wont even know till the last few days, or as your trimming then it was be all kicks in the nuts.
It's a rough game, because higher humidity can actually make the buds bigger an grow faster so things can look fantastic till it's too late.
 
hotrodharley

hotrodharley

Well-Known Member
growingforfun said:
While it's possible you'll manage to escape this without losing a lot to budrot at harvest, I wouldn't bet on it. I'd put your odds under 1% that at harvest you wont lose a fair bit to mold. A lot of times you wont even know till the last few days, or as your trimming then it was be all kicks in the nuts.
It's a rough game, because higher humidity can actually make the buds bigger an grow faster so things can look fantastic till it's too late.
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Agreed. Check this out.

https://www.growweedeasy.com/bud-rot
 
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Beachwalker

Well-Known Member
Septoria also loves your conditions, I'm planning to add a large dehumidifier this fall for that very reason, have you considered looking into a 30-50 pint dehumidifier?
 
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growingforfun

Well-Known Member
BlueDieselDog said:
Ok thanks.
My minimum Temps drop to around 77f & I have excellent air circulation.
What would you say would be the maximum rh% I could get away with? Please don't hit me back with 50%.....its never gonna happen.
https://www.thcfarmer.com/community/threads/for-you-folks-obsessed-with-humidity-some-valuable-information-must-read.32374/#post-566415
You may find the above article an interesting read.
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At the end of the day this is your grow an your welcome to do whatever you want, and some people can have plants thrive in differant conditions based on where they live. I believe that if you have high temps an high humidity it's high odds of heartbreak. The exact RH% isnt set in stone, but I'd worry over 55% I can tell you that much.
 
Huckster79

Huckster79

Well-Known Member
I like warm n humid for first few weeks of flower, tho not that much... id do all you can to get it down for the second half of flower... craigslist an AC unit asap if your on budget... theres directions online how to rig a vent for a window shaker even without a window...

I finished hot like that once- they survived but they tasted like hay no matter how much i cured and the effects were ok but lasted all of about 15 mins! After that i bought a window shaker and built the duct work to vent it out as i had no window for it, it works great...
 
BlueDieselDog

BlueDieselDog

Well-Known Member
Beachwalker said:
Septoria also loves your conditions, I'm planning to add a large dehumidifier this fall for that very reason, have you considered looking into a 30-50 pint dehumidifier?
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I have a portable air con with dehumidify option. It's a last hugely expensive to run option.
 
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growingforfun

Well-Known Member
BlueDieselDog said:
I have a portable air con with dehumidify option. It's a last hugely expensive to run option.
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Naw dude start running it. Let's do some quick math though to find out if it's worth it or not.. how much are you hoping to yield from this? Is that 800 true watts of led? I'm going to assume its 800 true watts since you started 300+500, so that should get you about a pound. So let's say you do nothing. You can expect to lose around 30+% to mold, and the remainder will have a poor taste because it was partially contaminated. So your looking at a minimum of a qp lost. Minimum. So what the going rate of a qp where you live? Low quality zips can be found for 40$, some places get 150$ a zip. So we are looking at a loss of between 160-600$ minimum to not run the aircon for its dehum function. Cost to run it 24/7 assuming its 1000 watts in most areas will be 60 bucks a month.

So decide where you land in that mix.
 
BlueDieselDog

BlueDieselDog

Well-Known Member
growingforfun said:
Naw dude start running it. Let's do some quick math though to find out if it's worth it or not.. how much are you hoping to yield from this? Is that 800 true watts of led? I'm going to assume its 800 true watts since you started 300+500, so that should get you about a pound. So let's say you do nothing. You can expect to lose around 30+% to mold, and the remainder will have a poor taste because it was partially contaminated. So your looking at a minimum of a qp lost. Minimum. So what the going rate of a qp where you live? Low quality zips can be found for 40$, some places get 150$ a zip. So we are looking at a loss of between 160-600$ minimum to not run the aircon for its dehum function. Cost to run it 24/7 assuming its 1000 watts in most areas will be 60 bucks a month.

So decide where you land in that mix.
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Lights pull around 765 true watts. Air con pulls 845 watts. Problem I have is my g/f's parents moaning, cos I'm doing it in their gaff....
 
Huckster79

Huckster79

Well-Known Member
I hate hearing my girl friends parents moan... kinda gross

Serious tho:

Heres the thing i got a boat, decent old tub... problem is gas is expensive... how fun is my boat without gas? Sure i can relax n float aroud in her but i cant drop the hammer down n scream around the pond without some really expensive liquid...you cant grow indoors without some kilowatts...

Btw speaking of expensive liquid make sure ur not blowing ur grow budget on expensive bottles at hydro store- wasted money on mystery bottles could pay for many kilowatts..

Ur grow ur call but none of us gunna lie to u and say ur just fine no prob there... i get it stinks but this isnt part of growing u can cut corners on,,,
 
BlueDieselDog

BlueDieselDog

Well-Known Member
I use cheap 3-9-9 nutes...closest I could get delivered here. I've switched it on for an hour to see the difference. I can only have it on 12 hours, so over night is my best option...... Cheers!
 
Huckster79

Huckster79

Well-Known Member
BlueDieselDog said:
I use cheap 3-9-9 nutes...closest I could get delivered here. I've switched it on for an hour to see the difference. I can only have it on 12 hours, so over night is my best option...... Cheers!
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Not sure on those nutes good or bad, they are different than "normal" doesnt mean you cant learn , nor havent already, how to use em, im just glad to see you havent taken out a loan to buy the full line up from fill in the blank overpriced nute company with 28 bottles of mystery liquid!
 
Lucky Luke

Lucky Luke

Well-Known Member
I don't think the temps is to much of a problem, It will at least finish and you will get a harvest. I flower in those temps, and warmer, in summer. That Humidity however is a problem and a major one.
You have to be no more than 70%RH with lots of airflow and movement preferably under 60%RH.
Leave your air intake and extraction fans on 24/7. May be even go passive intake and use both fans for extraction to help clear that damp air.
 
Huckster79

Huckster79

Well-Known Member
Lucky Luke said:
I don't think the temps is to much of a problem, It will at least finish and you will get a harvest. I flower in those temps in summer. That Humidity however is a problem and a major one.
You have to be no more than 70%RH with lots of airflow and movement preferably under 60%RH.
Leave your air intake and extraction fans on 24/7. May be even go passive intake and use both fans for extraction to help clear that damp air.
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I cant find flaw in any of this... this is good advice..
 
Huckster79

Huckster79

Well-Known Member
Luke is right if u have to triage it rh first then temp... but dont add to temp usi g that ac i n dehuey mode either
 
blowincherrypie

blowincherrypie

Well-Known Member
I agree with LL keep your extraction fans on and up. Also, idk if youre having your lights on at night but I think keeping your night/day temps from fluctuating too much might help you out some.

on a bright note.. your plants look way better than I was expecting from what I was reading. Once they start bulking up you're going to need to keep your air game strong tho. Good luck!

edit: idk what your space is like but it also seems like I have better control over rh etc in my tent than my buddies do who have grown without. Idk how many plants your doing etc. but it may be something else to consider?
 
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