Im not saying you cant use Co2 in veg. I prefer not to. I like the plant to get a good start before pumping them with Co2. I notice the leaves droop just a little with Co2 on and if I turn it off for a day the leaves will stand straight up. Different stains do different things. I just go with what works best for the strain im using at that time.

Quote Originally Posted by Stuper Star
First of all...such a great thread Tran. Really. Cheers :beer:
I actually came back to read it thru again as I'm considering going to a fully sealed setup. I came across a couple new posts since I was around last and have a question for ya regarding the above quote...
In my experience, everytime, without fail....not having some sort of fresh air coming into a vegging room has held the plants back. For example, lets talk about a 6K setup with 200clones. If the ventilation stays off for a few days (usually cuz it's so cold and dry outside that it'll pull the room humidity down way too low)...but anyways, the plants will be looking droopy, even tho they are growing ok. Within 10minutes of turning the outside ventilation on however...BOOM! The plants just perk right up and start rockin hard.
So I'm a little confused.
You're saying your room is 100% sealed up and no CO2 until wk1 of bloom...so that's a week or 2 of no CO2 and no outside air. I'm having a hard time getting my head around that....