How hot can it be in my grow room without experiencing any problems? I know how hot is said, but has anyone had experience with growing in heat? Like could I get away with 90 degrees fahrenheit? I'll have an inline fan and box fan going but my grow box still gets to like 90 sometimes a little over. Will my plants be alright? What type of bud am I looking at if temps are too high? Fluffy low potency or what?
How hot until plants are uncomfortable?
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Captain Keg
Well-Known Member
When it explodes into flames, then you might be in a trouble
Should be fine, I use hps & the heat is a plus but it's pretty cold in the uk anyway.
How far away from the plants are you keeping your light?
did you try using a fan?
Do you have your online fan going 24/7?
How big is your grow room/tent?
Co2?
There's a few details you haven't mentioned that would play a factor.
Should be fine, I use hps & the heat is a plus but it's pretty cold in the uk anyway.
How far away from the plants are you keeping your light?
did you try using a fan?
Do you have your online fan going 24/7?
How big is your grow room/tent?
Co2?
There's a few details you haven't mentioned that would play a factor.
How hot does your grow get? And the bud comes out fine? I'm keeping my lights about 18inches away. That's as close as I get before noticing light burn. Yes but I haven't started growing yet due to my heat issue. I'm using a 20" box fan over the tops and an inline fan. I run both fans 24/7. My grow room is like 2'x4'x4.5'. I do not use co2 although id like to. I have yet to find a cheap way to supplement co2 properly.
Captain Keg
Well-Known Member
Highest I've seen is 33 degrees & that was this summer.
But I use 1 600w hps & 2 400w hps.
Yeah comes out perfect lad, you'll notice if it's burning them.
I've noticed airy popcorn bud if I used something like superthrive in the flower.
Don't worry about that, I've seen hotter lol
Try running bag seed & see how it turns out, that way it's no big loose if it doesn't work out?
Good enough size, what light are you using?
Don't worry about co2 unless your grow is air tight.
Although you can do a DIY set up, check YouTube or try a co2 bag from eBay.
But I'd say get a small fan off eBay or Amazon, it'll help.
I'm working on a new grow room & plan to use 4.
I'm using two 300w leds and one 125w 6400k cfl
Thanks for the tip on a co2 bag I hadn't heard of that
Just measured my grow box I was a bit off lol it's actually 3.3ft long x 1.8ft wide x 3.0ft tall ... I know those are some weird dimensions haha what im using to grow I just threw together and rigged. Also I'm gonna do a scrog cause I'm only working with a few feet of height.
kermit2692
Well-Known Member
Lmao omg people really??... First off the co2 bag it will do nothing for you especially when you don't know what you're doing yet and are using cfls so skip that idea. These people aren't giving you good info AT ALL lol. You need to keep your grow at about 75 and ALWAYS under eighty or you will get shit results. bottom line no exceptions indoors except if you're using bottled co2 in a closed grow room in which case you can go up to 85, but, i still wouldn't. Better quality at lower to mid seventies.
WeedFreak78
Well-Known Member
Environment, environment, environment! If this isn't right, no amount of temp control will matter. You're space is around 18 cu ft. You need a minimum of 65 CFM, preferably 100-125cfm of air flow through the box, especially with 700W in there. Way to much wattage. People have trouble with 600Ws in a 4x4x6 tent @ 96 cu ft, which is 5X the size of your space. Plants will increase room temps. My room runs 65/70 with all equipment running, no plants. Once plants go in and start bulking up, temps go up 10F+. Living things create heat. If your seeing 90 with no plants it'll never work, your going to cook shit.
Growing media also has an effect. Dirt grows handle heat better than hydro, all else being equal.
Your info isn't exactly accurate. There's no hard and fast rules to growing, just guidelines. If you know how to read plants high heat isn't an issue. I run my room up to mid- upper 80's Jun-Sept without issue, no co2. I start seeing negative effects around 90F. Proper environmental control such as good airflow and correct RH is all it really takes. Higher heat requires a moderate amount of airflow and higher RH to provide a cooling effect, but not so much RH to slow transpiration rates. Most ambient air in a home has plenty of Co2 in it for these temps. Unless your growing high altitude indicas, we're dealing with mainly tropical plant crosses that can handle it fine.
Growing media also has an effect. Dirt grows handle heat better than hydro, all else being equal.
GroErr
Well-Known Member
Without CO2 90'sh seems to be the point where it's difficult to keep them happy, I use 85 as my max, beyond that although you can keep them going imo yields suffer, they tend to go fluffy the hotter it is ime. If you're in soil watering is a pain in the ass in a hot environment too. Your best bet is to target 85 or below and do what you need to do to get there.
Alienwidow
Well-Known Member
This all the way ^^^
kermit2692
Well-Known Member
Disagree.. Your quality will increase if you get away from allowing temps over eighty even if you are managing good quality at 85.. Try it
In order to run at 85 in a smaller room indoors and get some level of quality you must skew other factors. You can come up with a perfect storm that will grow decent bud at 85 but the perfect storm that grows good bud at 75 will grow MUCH better bud. Let's see some shots of what you pull out of 85.. No bs swotcheroo
In order to run at 85 in a smaller room indoors and get some level of quality you must skew other factors. You can come up with a perfect storm that will grow decent bud at 85 but the perfect storm that grows good bud at 75 will grow MUCH better bud. Let's see some shots of what you pull out of 85.. No bs swotcheroo
GroErr
Well-Known Member
If you're referring to my answer I was suggesting that as a maximum, keyword maximum. If he's running 90's I doubt he'll get his temps down to 75-80 unless he does a major overhaul of his space.
My personal preference and target is 78-80F and typically running 80F which I found to be the best for my style of growing, it does Ok, some current and recent pulls from that environment.
My personal preference and target is 78-80F and typically running 80F which I found to be the best for my style of growing, it does Ok, some current and recent pulls from that environment.
kermit2692
Well-Known Member
And that will work all day but if you hit 85 too often ime that will have negative effects.
Huckster79
Well-Known Member
If you cant bring temp down look into heavy 16 foliar spray, really helps the heat stress, idk how but it does iv seen it. the other thing thats supposed to help is silica, RAW NPK brand is silicon dioxide which doeant screw up ph like potasium silicate can.
Also higer RH will cut down on heat stress, ,google vpd chart for tomatoes. though very arguable if thats safe to finish, i often do it till week 6 or so then cut the humidity and temp.
I agree upper 80s is max even w co2. and if you finish that way you will finish but i highly doubt it will be of real high quality. i think w no co2 80 is max and thats pushing it.... gotta get more air exchanged, and or draw some air in from a cool part of house, i used to run my exhaust through dryer duct snaked through my cold crawlspace before returning as intake air, mine was sealed system though. that trip through the crawlspace cooled the air considerably. maybe you just duct intake air in from cooler location...
You could google making homade swamp cooler but that could cause some rh problems. i think ur best bet is exchange more air more rapidly....
Also higer RH will cut down on heat stress, ,google vpd chart for tomatoes. though very arguable if thats safe to finish, i often do it till week 6 or so then cut the humidity and temp.
I agree upper 80s is max even w co2. and if you finish that way you will finish but i highly doubt it will be of real high quality. i think w no co2 80 is max and thats pushing it.... gotta get more air exchanged, and or draw some air in from a cool part of house, i used to run my exhaust through dryer duct snaked through my cold crawlspace before returning as intake air, mine was sealed system though. that trip through the crawlspace cooled the air considerably. maybe you just duct intake air in from cooler location...
You could google making homade swamp cooler but that could cause some rh problems. i think ur best bet is exchange more air more rapidly....