mr sunshine
Well-Known Member
Mid 80s if you're running co2.. 76 to 78 if you're not.
Best temperature range for growing cannabis?
- Thread starter HydroNito305
- Start date
Alienwidow
Well-Known Member
Ya theres green in the 59 degree box. Im sorry but at 59 degrees weed grows like crap. I hate to say it but that chart is a chart of lies or not for cannabis.
Alienwidow
Well-Known Member
You agree with that chart? Ya figure weed grows good at 95 degrees or 59 degrees? Personally i think that charts totally wrong.
ArcticOrange
Well-Known Member
No i said its a nice guidline. The chart expresses the kind of humidity level required at 95 degrees doesnt suggest it grows well.
GrowerGoneWild
Well-Known Member
Its not a guideline for growing temps, I think he was trying to show the relationship for RH, Temp... The hotter air can hold more moisture in a happy zone is what that chart is for.
Connoisseurus Rex
Well-Known Member
I grow at 60 degrees in the seedling stage. My temps go below that, sometimes down to 56. Never had an issue.
I don't drop them that low again until late flowering but I have yet to notice any ill effects.
Connoisseurus Rex
Well-Known Member
Humidity was a tad low but it'll be back up in about 15 mins.
The canopy is at a cool 67. No slowed growth. No excess drinking. No problems at all.
ArcticOrange
Well-Known Member
Precisely, nice to see someone else alaska grown on here.
Lord Kanti
Well-Known Member
I vote "other" because every strain is different. Even the same strain can have different phenotypes as shown in the Alien × Triangle autos I'm growing.
daloudpack
Well-Known Member
i get my happiest plants at 72-75 lights on and 58-62 at night
holy shit that seems cold, have you ever tried raising your temps to see if they grow faster?
Connoisseurus Rex
Well-Known Member
Yea. I've run all the way up to 80 for seedlings. I like to stress them out of the gate. Growth rate in the seedling stage, at least in my experience, grows hardier when raised in true spring temperatures. These fuckers pop when night temps are still going down into the 40s and day temps may only reach low 50s with only a few hours of light here and there.
They thrive in nature. Ever seen an outdoor grow? It's not just because of the lighting. A side by side grow, same pot size, same nutes, just one outside and one inside with the best light in the world. I'll put my money on the outdoor for the best grow.
The more stress you put on them, the hardier they will be, the more resilient they will be and the stronger they will grow. Just my experience though.
ttystikk
Well-Known Member
I understand your confusion. The chart is for VPD, not optimal temps for growing cannabis or anything else.
Set/find the temperature range you want for the crops you're growing- such as your preferred range for cannabis, then read across to find the optimal RH range for best growth... AND, it turns out, CO2 uptake.
If the air is too moist, the plant can't take up sufficient nutes. If too dry, it has to close its stomata to defend against wilt. The sweet spot in between allows the plant to transpire and draw up nutrients efficiently while also keeping its stomata open for effective CO2 uptake.
Thus, if you want your ladies to make the most of the CO2 in the room whether it's supplemented or not, keep your conditions in line with optimal VPD.
Alienwidow
Well-Known Member
Well why didnt someone tell me it was just a happy zone chart. That makes more sence because it doesnt look like an optimal grow temps chart. And now i am in the happy zone.
guardogz
Member
anything below 60 and my plants get purple. then i might start chasing my tail. temps are 63 at night and 77 during lights on. i have low rh so that may be diff than those w rh control. late in flower i sometimes let the temps go below 60 for some xtra color etc. and like others have said diff strains like diff temps
HydroNito305
Well-Known Member
Vapour Pressure Deficit
yeah makes total sense, guess they call it weed for a good reason, its hard as hell to kill it lol but yeah people get ridiculous with the outdoor grows, 15ft plants and shit lol
Alienwidow
Well-Known Member
I think you mean the happy zone. THERES NO LABLE ON THE CHART. Ok, now back to the happy zone....
kiwipaulie
Well-Known Member
I try to keep between 22-25c, but let them run hotter later into flower, say up to 29c
Connoisseurus Rex
Well-Known Member
That's how I see it. It also helps to weed out weaker plants to push for stronger genetics.