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I go for 8 mains, that means 3 times. It's really grower preference. Sativa dominant strains tend to be pinched harder.

You'd do the main center once. That then splits into 2. You can split each of these again.

The complete sublimation of 1 pound of dry ice produces 8.8 cubic feet of carbon dioxide. That's 1,000,000 ppm. In an 8x10 room with 8 foot ceilings: 640 cubic feet, you'd need 3 quarters of a pound every hour with no ventilation to keep levels at 1500 ppm. If you're cycling your ventilation...

I said Good day, Sir.

Good day, Sir.

Dude, I said repeatedly that with proper ventilation CO2 won't be a problem. You produced 1 weak blog post some stoner wrote about a closet. CO2 levels aren't going to drop that dramatically, even with minimal ventilation. Can you please Google "hardening off " and then respond? It is the...

Without ventilation? Where did that even come into the equation? Have you ever worked in a commercial greenhouse? I have. For 4 years while earning my degree in Horticultural Sciences. I'm not saying you can bring temps slowly to 105 and keep them there. You said that. I am saying that after a...

Actually, now that I have had a sober morning to think about it, I would attribute the heat tolerance to the plants being hardened off. Almost all plants that are started indoors need a hardening off period before they can be put outdoors. Just so they kind of get used to the weather extremes...

To deplete a room of CO2, we must assume that room has very little or no ventilation. Even an 8x10 closet with a small 50CFM fan would replace the air 12 times an hour. I would venture a guess that the indoor plants haven't been hardened off like most outdoor plants require. Soil temp also...

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...

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

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.

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...

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?

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...

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.

I go to the second set of true leaves. Cotyledons don't count. You'll get a pair of leaves, then a second pair, then more, I rip off the more. Look up "mainlining".

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.

What he said. ⬆

I think the PH is around 6-6.5 and the espoma lime seems to work for the entire grow for me in 5 gallon buckets. The Fox Farms soils already have PH buffers in them and shouldn't need much if any lime. I don't think liquid feeding will affect PH much at all. Don't go crazy with nutes, a dab...