Why can temps be higher growing outdoors vs indoor

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chronnie49

Well-Known Member
I have never grown outdoor but I live in an area where it gets over 100 degrees in the summer and people are growing great buds. It seems like most people agree that indoor temps shouldn't be higher than mid 80s, so why can outdoor temps be higher than indoor to grow quality medicine?
 
Immortalpeace

Immortalpeace

Well-Known Member
chronnie49 said:
I have never grown outdoor but I live in an area where it gets over 100 degrees in the summer and people are growing great buds. It seems like most people agree that indoor temps shouldn't be higher than mid 80s, so why can outdoor temps be higher than indoor to grow quality medicine?
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I wonder this as well. Outdoor grown buds actually will test out with a higher thc percent and more terpenoid profiles than indoor. My greenhouse has been up to 100 when it's 105 to 110 outside.

Aurora indica organic greenhouse. First time growing it.
 

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a mongo frog

a mongo frog

Well-Known Member
Immortalpeace said:
I wonder this as well. Outdoor grown buds actually will test out with a higher thc percent and more terpenoid profiles than indoor. My greenhouse has been up to 100 when it's 105 to 110 outside.

Aurora indica organic greenhouse. First time growing it.
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Do you have any test results from your out door we can see?
 
superbak3d

superbak3d

Well-Known Member
You can make the argument that the higher leaf temps result in more trich production.

Resin is how a cannabis plant protects itself. It's a pretty durable and adaptable plant for the most part.

I know tall growing sativas thrive in high temps, they just need plenty of water
 
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chronnie49

Well-Known Member
superbak3d said:
You can make the argument that the higher leaf temps result in more trich production.

Resin is how a cannabis plant protects itself. It's a pretty durable and adaptable plant for the most part.

I know tall growing sativas thrive in high temps, they just need plenty of water
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So do you think if i grew a sativa indoors and the temp reached 100 it would still turn out good? The only thing I can think of is the co2 levels might be higher and the airflow is better outdoors allowing for higher temps.
 
Bulletproof_Love

Bulletproof_Love

Well-Known Member
I think it has to do with your light source and light burn which is why temps need to be lower. For example the sun is 92 million miles away and lumens per sqfoot of sun is crazy high. But an HPS 2 inches away will burn the tips of the plant. I dunno. I can't grow outdoors anyways.
 
superbak3d

superbak3d

Well-Known Member
As long as the humidity is high enough to prevent the leaves from drying out, the higher temps can trigger more vigorous resin production.

Hell, if you're running LED cobs like I am, the canopy temp needs to be at 80-85F anyways. Can very easily go up to 90 if you offset with an increase in humidity.

Just be prepared to shorten your watering times, cause they'll drink like a MF!
 
superbak3d

superbak3d

Well-Known Member
chronnie49 said:
So do you think if i grew a sativa indoors and the temp reached 100 it would still turn out good? The only thing I can think of is the co2 levels might be higher and the airflow is better outdoors allowing for higher temps.
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Offset it with high humidity and plenty of water for the roots to have access to.

100 is really pushing it, you'd need to maintain like 70-80% humidity with very good airflow.

Humidity is the difference between a tropical jungle and an arid desert.
 
MeJuana

MeJuana

Well-Known Member
Pull your plants back from the light they can take the temps.. The light coming from your HPS is several times hotter than infarred light.. As it was mentioned above you can't put a plant under direct HPS when temps are ovef 85F.. Actually though that number is really 80F for most strains I've tried.. It is that very hot HPS that ends the fun.. Leaf temps exceed what they would get outdoors at these temps
 
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chronnie49

Well-Known Member
MeJuana said:
Pull your plants back from the light they can take the temps.. The light coming from your HPS is several times hotter than infarred light.. As it was mentioned above you can't put a plant under direct HPS when temps are ovef 85F.. Actually though that number is really 80F for most strains I've tried.. It is that very hot HPS that ends the fun.. Leaf temps exceed what they would get outdoors at these temps
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That makes sense, thanks:)
 
Kevin the Great

Kevin the Great

Well-Known Member
I was under the impression that growth started to stall after about 85 degrees and with the indoor environment able to be completely manipulated for ideal environment, 85 was a rule of thumb max. I've had a fan failure in the past and my temp probes maxed at 110. A night time watering and they were fine in the morning. I wouldn't recommend it, but they turned out fine. I've also heard that trichome degradation occurs much faster at higher temps. Another possible advantage of lower temps.
 
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Indicafatbud

Active Member
I think you need to take into account the extra protection from heat in the root zone as the number one reason for the ability to withstand higher temps outdoors. Container plants outdoors in the smaller veriety say 50 gallons or less still run into this issue. I'm pretty sure if you threw a 300 gallon smart pot indoors you could run your temps at 95 no problem. Another thing to account for is the spectrum of light, the sun has everything a plant needs. our indoor lights, despite their bostes and claims, don't. UVB I belive being one of these things. This is also the reason why putting plants outdoors in veg can Regenrate them, helping to protect your plants genetic viability.
 
J Bleezy

J Bleezy

Well-Known Member
I always read that when temps rise indoors, the plants deplete the room of co2 quickly and that's when it becomes a problem.
 
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