What's the optimum temp/humidity for cannabis?

[kinesis]

Hi, I'd like to know just what the title says.... IF I cant maintain humidity in my room ill install a vicks vapor inhaler on a timer 1 hour per day in my grow chamber, that way i dont have to worry. so what's the ratings?

 

[Jnugg]

70-78F Lights on and 65-70 Lights off with an RH% of 50-65%....you'lll want to drop the RH% just a tad once you're half way into flowering.

 

[Guest]

Jnugg is right, unless you're injecting co2... then you want temps at 85-89 with 1500ppm for optimal results.

 

[bongman1221]

what should it b if you are useing co2

 

[Stone Skunk]

so co2 can be used as a solution to uncontrolably high temps? I've been wondering if i could use a paintball co2 tank just barely turned on to leak slowly.

 

[Guest]

From most of the books/mags/posts I've seen, along with my own experience, 1500ppm of CO2 maintained along with temps from 85-90. I usually run the injections/monitor until the temp hits 91, then the fans kick on until it drops to 85 and cycle repeats.

Again, that is only with a constant CO2 level - dont attempt that with a bottle of yeast/sugar.

 

[Jnugg]

so co2 can be used as a solution to uncontrolably high temps? I've been wondering if i could use a paintball co2 tank just barely turned on to leak slowly.

Ummm I'd buy a regular 20lb Co2 tank and then spend the $150 on a regulator and other accessories you'll need....you wouldn't want to kill yourself if there were too much co2 would you?!

 

[DIGITALHIPPY]

86 max.
the hotter it gets the more 'stomas' open on the leafs, plant lungs lets say, that also mean the more CO2 its breathing... but at 86 its at 100% open, any hotter and it starts stressing, it cant 'breathe' any more, now CO2 is more effective when its warmer, because heat, as you know, causes things to expand, and the air is included, so that also mean less molicules of gas to contain co2. i hope im making sence. 70-75 no co2 80-85 when there is co2 and ull be ok, when it gets much hotter the plants will strech and have 'fluffier' nugs.
co2 from a airgun