is 75-80 really optimum for marijuana?

i was just checking the temperature today in lahore, pakistan and it's 38*C... it's going to be 44*C in a few days...

now, i'm not an expert but marijuana manages to grow fine in these areas... and in fact being outdoors, yields considerably more.

i've been doing good 85f,but i like it a lil warm

Think about where the plants are typically found naturally and it will give you a sense for what conditions they like. Most strains will enjoy arid and hot weather. Resin development is not for our pleasure as much as we would think - its a natural defense the plant uses to prevent (among other things) water loss from the hot weather typically in the late summer during its peak harvest. To promote that development you will want to mimic those same conditions - i.e., warmer, dryer air. I usually average about 78 in the dark and light cycle, and 91 in the light with relative humidity about 35% (flowering).

kash959 said:

i was just checking the temperature today in lahore, pakistan and it's 38*C... it's going to be 44*C in a few days...

now, i'm not an expert but marijuana manages to grow fine in these areas... and in fact being outdoors, yields considerably more.

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While true to some extent, and the strains in these regions may like it a little warmer than most, the largest and most productive growing regions in these areas are typically high up in the mountains... This is where the strain "hindu kush" gets it name, that is a mountain range stretching through pakistan and afganistan. Likewise, the Parvati region in india, well known for its 6 ft+ monster trees is at a high elevation. Where relative humidity is very low from the altitude and temperatures generally stay in the 60-85f degree range.

I think many generations of growers would know what they're talking about.

aficionado said:

Think about where the plants are typically found naturally and it will give you a sense for what conditions they like. Most strains will enjoy arid and hot weather. Resin development is not for our pleasure as much as we would think - its a natural defense the plant uses to prevent (among other things) water loss from the hot weather typically in the late summer during its peak harvest. To promote that development you will want to mimic those same conditions - i.e., warmer, dryer air. I usually average about 78 in the dark and light cycle, and 91 in the light with relative humidity about 35% (flowering).

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91 is REALLY high, unless that is including radiant temps. to measure pure air temperature just cover the thermometer with shade, at about the top of the canopy. I use an index card taped to the wall.

91 is the temp I avg with Co2 burners going (propane) for the organic soil grows I do - towards the high end. I do end up watering more, but I have had great results thus far with no real loss to heat stress (unless I miss a watering day - but thats a whole other story). The theory that I run with is that these are late flowering summer plants grown in moderately high temps and arid conditions, so to bring out their best, align with what would be naturally found in the 'wild.' I believe stress due to heat (within reason) helps encourage resin development and can be a good thing for latter stages of flowering.

aficionado said:

91 is the temp I avg with Co2 burners going (propane) for the organic soil grows I do - towards the high end. I do end up watering more, but I have had great results thus far with no real loss to heat stress (unless I miss a watering day - but thats a whole other story). The theory that I run with is that these are late flowering summer plants grown in moderately high temps and arid conditions, so to bring out their best, align with what would be naturally found in the 'wild.' I believe stress due to heat (within reason) helps encourage resin development and can be a good thing for latter stages of flowering.

Click to expand...

thank you for mentioning CO2 cause thats why you try and keep your grow under 85, your plants stomata open up, and will start needing more carbon with higher temps and if your plants are outside theres plenty of CO2. ill go look for the thread with all the info i just read through it agian today

My room stays in the mid-80's, about 40% humidity. My plants are going pretty good. I'm not happy about the temps but we can live with them.

my uncle has grown monsters outdoors in the mojave desert. summer temps 115. i think if you can control the humidity alittle in a dry heat you will be fine, they grow in afganistan also

those numbers are more for indoor growing, now use a little common scene here and realize a sativa strain from south east asia may not do as well as a Afghan strain that would be right at home in your reign