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Outdoors, plants can send roots down into the soil where it will be cooler. They can tap into moisture and facilitate the plants' transpiration ( a LOT of it). Most days even when the air is still will still have occasional air currents which help in the transpiration process and its inherent cooling affect. While the humidity might have been high at times, even a puddle on a 99% RH day will evaporate when it becomes hot enough. And even though the CO2 content of any given volume of the outdoors is less than a like volume grow room that has CO2 supplementation, that outdoors is not separated into grow rooms - the CO2 (along with everything else in the air) is pretty stable at that level because it is being constantly refreshed. The roots of a plant that is growing in decent soil are also going to have access to O2. Also, most areas don't start at 100°F the moment the sun rises but instead take a few hours or longer to get to that temperature (but a poorly-cooled grow can jump 20°F or more in an hour) so I would expect that there would be at least some growth (sic) even on the highest peak-temperature days.
Plants seem to be better able to adjust when their green parts are warmer than their white parts. When they have adequate amounts of CO2 - either through supplementation or via constant air-exchange. When their roots are given mad supersaturated dissolved-oxygen levels via the nutrient solution. When their is enough airflow to aid in transpiration.
Higher ambient temperatures make it more important.
But you know all of that, lol, so I guess it was a rhetorical question like, "Why did the chicken cross the road?" (Because he was f'king high.)
And as you mentioned, choice of strains would play an important factor. A native strain or one bred for success in like conditions can oft times be more productive (and have higher "net potency") than the ones that are merely bred for highest potential yield and potency.
great post! +rep. Ive had plants grown in pots out in summer heat and they did just fine, 5gal pots. i try to make my room as close to the outdoor as possible.lol. tons of fresh air coming in from out side and getting sucked right out so everything stays fresh. just like out doors. and i made my hempy buckets to act like the ground out doors, little dry on top but underneath their O2 just like in the out side ground above the hard pan that holds the water under the out side dirt. I have a good friend thats a soil expert and he kinda ran me threw on how the typical type on soil is that seems to make plant thrive, thats what he does for a living testes different types of soils and stuff. and i made my DI buckets to try to mimic the mother nature's ground. my buckets have different layers of mixes just like the outside ground. more aerated mix on top then it gets moister as the roots go down until the have all the moister they want. i am not saying i did it right.lol, but i tried my best. mixing different lays or sunshine and perlite to mimic outside ground.
your right! most area dont start off at 100F* just like my grow room doest, its gets hooter as the sun rises and heats up the outside air. since i am drawing in fresh air from out doors its bringing in the heat from out side also.
allot of led growers are miss lead by sales people! some have told me the same BS. with leds you dont need to run ventilation because they run cool. well if you here this dont buy into their BS because they dont know too much about growing! you do need fresh CO2 and it has to be pulled away once it stale. Fresh CO2 is key to growing good buds. can you grow in a sealed room? yes, but dont expect any crazy yield are really healthy plants. its just a sales scam.
Ive done it before with a good strain with leds in the heat like this and i believe i can do it again, but better without the spider mites.lol.. high temps and spider mites is no joke, never seen something spread that fast and web things up the quick. worst time of my life. but a lesson learned about being clean. who know this grow good go to shit? one way to find out. if so their always out doors.
