Heat vs. Containers

I was on here a lot last year when I did outdoor and learned a ton from you all (thanks a lot by the way!)

One thing I learned is as long as you have a 50-100 gallon container then the plants can withstand the heat and even thrive like they do underground.

So my question is:
Would that same concept work indoors? I Was thinking transplanting a 2 gallon container into a 10 or 20 gallon container a couple days before 12/12.
Is there any flaws anyone can think of other than waisting soil? I would think that would be enough soil to buffer the roots from the heat?

How hot does your room get? I wouldn't worry about root heat unless it gets above 100 degrees

I personally like using larger pots indoors. I use 10gallon smart pots, 4-5 per 1000w depending on strain. veg for 3-4 weeks and kill it

CA MTN MAN said:

How hot does your room get? I wouldn't worry about root heat unless it gets above 100 degrees

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Right now 80 tops, but I was trying to plan because what I put in flower now will be in flower during the hottest time of the year. Going to run lights at night though, highest temp should be 90(ish). I was just concerned it might make them stretch a lot or do weird things. I've also heard beneficials die off above 85 degrees?

So as long as it's below 100 shouldn't be anything to worry about?

707humboldt said:

I personally like using larger pots indoors. I use 10gallon smart pots, 4-5 per 1000w depending on strain. veg for 3-4 weeks and kill it

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For sure, that's def what I'm gonna do this time, especially since i will have higher temps later on this summer. Would blow to have to be watering like 2x/day.


Oh hey one quick question:

My night time temps will be just as high if not higher than my daytime temps. Would you happen to know if this will do anything weird?

I aim to keep my temps below 80 while the lights are on and I run co2. When lights are off I like to be in the 70 range. Ive never experienced those high of temperatures indoors so I'm not sure, its not good for your plants though for sure. Its definitely better to be around 80. Why don't you get an AC? It gets in the 100s here in the summer (its already hit the 90's a couple days this week) and i wouldn't be able to grow without one. Hotter temperatures are going to produce more airy/fluffy buds.

With my 10's indoors, I have to water/feed every 2-3 days towards the end of flower when they are drinking/feeding the most. They finish off around 4-5' tall depending on strain.

707humboldt said:

I aim to keep my temps below 80 while the lights are on and I run co2. When lights are off I like to be in the 70 range. Ive never experienced those high of temperatures indoors so I'm not sure, its not good for your plants though for sure. Its definitely better to be around 80. Why don't you get an AC? It gets in the 100s here in the summer (its already hit the 90's a couple days this week) and i wouldn't be able to grow without one. Hotter temperatures are going to produce more airy/fluffy buds.

With my 10's indoors, I have to water/feed every 2-3 days towards the end of flower when they are drinking/feeding the most. They finish off around 4-5' tall depending on strain.

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Because that is not an option. I am not worried about fluffy buds. I am aware what temps should be. I generally get the best results with 75 during the day & 65 at night. That's crazy you have to water that much in 10 gallon containers. I've been running sour d's and blue dreams in 5 gallon containers that finish out as 5.5-6.5 ft tall bushes and I only have to water once every 4 days during their peek needs. Once every 7 days majority of their life. (Temps being 75-80) Your soil must not retain as much water or something?


You mentioned buds may get airy.. That is a lot of what I am trying to find out; why is it that if you have a big enough container outdoors temps can reach even up to 110 degrees and the plants still thriving + getting rock hard buds? I am assuming there is enough soil there to buffer the roots? How come that same concept can't be applied indoors? How big of a container for how small of a plant would be needed to reach that indoors?

I use a 66% ocean forest/ 33% perlite mix so I have a lot of drainage in my soil, that might have something to do with it. Outdoors I have plants with the same soil mix in 100g pots that need water every other day during peak season.

Imo, temperatures out doors normally reach that temp july/august and its not constantly that hot. In september when the plants are in full flower and really bulking up, the temperatures generally are not that hot. If it reaches 110 its never for more than a few days in a row and imo its not long enough to affect the plants that much.

707humboldt said:

I use a 66% ocean forest/ 33% perlite mix so I have a lot of drainage in my soil, that might have something to do with it. Outdoors I have plants with the same soil mix in 100g pots that need water every other day during peak season.

Imo, temperatures out doors normally reach that temp july/august and its not constantly that hot. In september when the plants are in full flower and really bulking up, the temperatures generally are not that hot. If it reaches 110 its never for more than a few days in a row and imo its not long enough to affect the plants that much.

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I gotcha. I've just been using straight ocean Forrest with no perlite so that must be why. I only use perlite in the winter when they are drinking less in order to speed up growth.

I agree with you on temperatures during the time of year outdoors. But last year I did light dep during the hottest time of the year and through out their whole flowering period temps never dropped below 100 & the usual was 103-108 & those buds came out denser, stinkier & frostier than the ones I let go the whole season that flowered out with lower temps. I've also watched many light dep grows on here where people experienced the same thing. So why is that? I think it's because the sun is stronger that time of the year, but how come you can still get nice dense buds outdoors In the heat, but people claim that indoors it will cause all sorts of issues? That is what I am trying to compare to in order to figure out what will work best for my situation indoors. Btw I should be able to keep temps 80 or below running at night, but I haven't ran this much in the summer here with my current set up so am just trying to prepare for worse case scenario if temps do reach 90+ indoors.

Yea my july/august deps always come out the best as well. But they don't come out as good as my indoor in a completely controlled environment. I think they will grow at those high temps indoors and even produce pretty well but they just wont be the best they could be IMO.

Outdoor plants have a bigger root mass that takes a lot more to heat up, and can cool down at night. Indoors the root mass is smaller so heats up quicker and if the dark cycle is during the day, won't cool down as much. Just an idea, but I'm guessing all the UV in the middle of summer helps make those dense resinous buds, whereas later on for full season we might not get a sunny finish and the sun is lower in the sky, so not as much UV?

707humboldt said:

Yea my july/august deps always come out the best as well. But they don't come out as good as my indoor in a completely controlled environment. I think they will grow at those high temps indoors and even produce pretty well but they just wont be the best they could be IMO.

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Thanks G I appreciate all the advice and info. I'm just gonna play around with it and see how it goes. Hope you have a great, abundant grow this year!

calicocalyx said:

Outdoor plants have a bigger root mass that takes a lot more to heat up, and can cool down at night. Indoors the root mass is smaller so heats up quicker and if the dark cycle is during the day, won't cool down as much. Just an idea, but I'm guessing all the UV in the middle of summer helps make those dense resinous buds, whereas later on for full season we might not get a sunny finish and the sun is lower in the sky, so not as much UV?

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Yeah I thought about outdoors night time temps drop low where here they won't. I appreciate you pointing all that out. That's some good info I was looking for. That would make good sense as far as the strength of the UV rays where as indoors you don't gave that with hps/mh lights