Why can temps be higher growing outdoors vs indoor

[Mount]

I only recently started indoors but have grown outdoors for years... the temps was an adjustment for me as it would be in the 80's, 90's and occasionally the 100's outdoors, but indoors it seems 76 is kinda the sweet spot without CO2..even though I can't say with science, I agree with thegreensufer... root temps... indoors the rootzone is more or less directly exposed to the temps within the grow space, but outdoors it is protected underground...I will say, when the temps outside were in the 90's and 100's at the end of flower, the buds weren't as dense..

 

[J Bleezy]

While it is true that plants will handle higher temperatures if supplemented with CO2, I am not sure if it's because they deplete the room of CO2.

It seems like common sense to me. If they use more co2 at higher temps, then when temps rise, they are gonna use more than normal and there won't be much co2 left in the room.

 

[Kevin the Great]

It seems like common sense to me. If they use more co2 at higher temps, then when temps rise, they are gonna use more than normal and there won't be much co2 left in the room.

So by that logic, if I have 1 plant in a big room with plenty of air around, I can safely run higher temps since the room CO2 won't be used as fast by the single plant.
Nope.

 

[J Bleezy]

It was a nice try to take my comment out of context, but.....FAIL
#1 A big plant will use just as much co2 as a bunch of small plants, it's more about how much foliage than the # of plants (not sure where # of plants came in here).
#2 when people "safely" run higher temps as you put it, they are pumping up to 1500 ppm of co2. The measly 300-500 in your house isn't gonna cut it. Like I said, they will use that up in no time at high temps.
Outdoors whole different story. They aren't gonna use up all of the co2 outdoors.

 

[thegreensurfer]

I only recently started indoors but have grown outdoors for years... the temps was an adjustment for me as it would be in the 80's, 90's and occasionally the 100's outdoors, but indoors it seems 76 is kinda the sweet spot without CO2..even though I can't say with science, I agree with thegreensufer... root temps... indoors the rootzone is more or less directly exposed to the temps within the grow space, but outdoors it is protected underground...I will say, when the temps outside were in the 90's and 100's at the end of flower, the buds weren't as dense..

It would be interesting to compare soil to hydro. Since you can control water temp in hydro.....Run an experiment with elevated temperatures and see if the hydro has an advantage because its roots stay cool.
Maybe it's already been done...I don't know....

 

[Kevin the Great]

It was a nice try to take my comment out of context, but.....FAIL
#1 A big plant will use just as much co2 as a bunch of small plants, it's more about how much foliage than the # of plants (not sure where # of plants came in here).
#2 when people "safely" run higher temps as you put it, they are pumping up to 1500 ppm of co2. The measly 300-500 in your house isn't gonna cut it. Like I said, they will use that up in no time at high temps.
Outdoors whole different story. They aren't gonna use up all of the co2 outdoors.

Alright, then let's change parameters. Are you saying that a potted plant in a ventilated greenhouse will consistently handle higher temps? If I were to open a window on a 105° day so fresh air blew in but temps remained high, would my girls be just as happy as in-ground outdoor plants? No.
1 small plant in a big room cannot handle elevated temps. Does the room quickly run out of oxygen if you do pushups? So much so that you start to feel faint? Didn't think so. Your plants don't feel that way either, unless you have very, very poor ventilation.
Besides, supplementing CO2 is only more efficient at elevated temps, allowing a few degrees. Adding CO2 doesn't mean your temps can be 100+ all day.

 

[J Bleezy]

Lol yes I am saying a potted plant would be fine in a well ventilated greenhouse in 105f temps. It happens all the time.
Are you saying otherwise?
So, if plants didn't use up co2, then why do people spend so much $ on enriching their rooms? Why not just pump it up to 1500ppm one time and it should stay there forever according to you? These people are wasting their money

 

[bryangtho]

I have a few set up a round the place. This summer one of my rooms reached over 120 in temp the plants were fine it was 109 out side

 

[Kevin the Great]

Lol yes I am saying a potted plant would be fine in a well ventilated greenhouse in 105f temps. It happens all the time.
Are you saying otherwise?
So, if plants didn't use up co2, then why do people spend so much $ on enriching their rooms? Why not just pump it up to 1500ppm one time and it should stay there forever according to you? These people are wasting their money

I'm not saying that CO2 enhancement is a waste of money. I just don't think the CO2 levels will drop that dramatically. With proper ventilation, I don't see why inside CO2 would be that far off from outside.
Out of curiousity, what are your temps? I keep mine below 82. Are yours 105?

 

[J Bleezy]

Mine range from 85ish to 70ish depending on time of year. Can somebody not know something about high temps without running high temps? As I already said it DOES cause problems indoors, so I guess my questionto you is, why would you think mine are 105f? And why are you so argumentative?
And also, yes people can breath up all of the oxygen in a sealed room and die from co2 poisoning. Look up the California laws of acceptable co2 levels indoors in businesses

 

[J Bleezy]

www.theweedblog.com/co2-and-marijuana
Check out the article by dr who. You won't have to read too far until he mentions what I'm talking about...

 

[Kevin the Great]

Mine range from 85ish to 70ish depending on time of year. Can somebody not know something about high temps without running high temps? As I already said it DOES cause problems indoors, so I guess my questionto you is, why would you think mine are 105f? And why are you so argumentative?
And also, yes people can breath up all of the oxygen in a sealed room and die from co2 poisoning. Look up the California laws of acceptable co2 levels indoors in businesses

My apologies, I'm not trying to be read as argumentative, we're discussing a topic and expressing our views. Just as most conversations go... I didn't assume your temps were 105 but you are advocating for high temps so hard that I figured I could make the point of asking why your temps aren't high if you think cooking them is OK.
I read the entire article. It clearly states that with proper ventilation CO2 isn't a problem.

 

[Kevin the Great]

On a side note, my next investment will be a good CO2 meter so I can accurately measure concentration levels and run a few high temp tests of my own. I've also read that at elevated temps the stomata close in an attempt to save water, thus, more or less pausing plant growth until temps drop again.

 

[J Bleezy]

here you go champ, I took a screen shot of it for you.
"If 6 plants in a closet and there is no ventilation, your plants can use the co2 in a few hours. Then they stop growing"

 

[Kevin the Great]

View attachment 3645826 here you go champ, I took a screen shot of it for you.
"If 6 plants in a closet and there is no ventilation, your plants can use the co2 in a few hours. Then they stop growing"

Yep. Did you read the part about no ventilation? I know that I did.

 

[J Bleezy]

???
Dude, are you serious right now?
That is what I've been saying this whole time is with good ventilation it isn't a problem. And then you went on some rant about how plants cannot use up a rooms supply of co2, then I posted a link that talks about such and now you bring up ventilation? What does ventilation have to do with the fact that you said plants cannot deplete a room of co2?
I'm about done here, it's like arguing with a wall.

 

[J Bleezy]

My apologies, I'm not trying to be read as argumentative, we're discussing a topic and expressing our views. Just as most conversations go... I didn't assume your temps were 105 but you are advocating for high temps so hard that I figured I could make the point of asking why your temps aren't high if you think cooking them is OK.
I read the entire article. It clearly states that with proper ventilation CO2 isn't a problem.

Honestly, I think you misread one of my posts somewhere as I have never purposely ran high temps or told anyone else to for that matter.
It's all good

 

[Kevin the Great]

Honestly, I think you misread one of my posts somewhere as I have never purposely ran high temps or told anyone else to for that matter.
It's all good

I'm not trying to argue. Just clarification for future. The original question was about why a plant in a pot indoors can handle less heat than a plant outdoors in the ground. I do not believe there is much if any CO2 depletion IF THERE IS ADEQUATE VENTILATION. Sure, plants change CO2 to O2 in the whole 6CO2+12H2O+672kcal of light energy=C6H12O6+6O2+6H2O scheme but like the article said, you'd have to fill a closet and not have any ventilation before it would be a problem. CO2 depletion is more than likely not the reason why indoor potted plants are less heat tolerant than their in-ground counterparts.

 

[J Bleezy]

I think it's a pretty good guess of one of the reasons as it would be preety tough for them to deplete the earth of co2.
Since you've argued against my comments for days now, care to offer your opinion on why plants can handle more heat outdoors?

 

[chronnie49]

I didn't mean the outdoor plants had to be in the ground, they could be in pots also. I've done a lot of searching and still can't find a definite answer, but still a good debate goin here.