I have my plants growing out doors and I was wondering if co2 tanks would be a good investment, or if co2 is better for indoor use. The girls are in an area about 20x10 ft and surrounded by brick. Also, if I do use co2 should I use it throughout the entire veg and flowering process? Thank you

You should preload the area with CO2 for a few months prior to planting, then run it 24/7.. Depending on the wind, 500-600 tanks/day should be sufficient.. Would get pretty pricey though.. I guess another option would be to get a genetically engineered hamster/wolverine/killer-bee cross and let him both supply the plants with CO2, and guard them from thieves..

lol

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And - don't forget an air-conditioner to control the temperature!

not for outdoor

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You can use it in a greenhouse, If you can somehow manage to wrap the hose around your outdoor plants I suppose it can work, but not as good as it would indoors.

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Best outdoor CO2 supplimentations are things like busy roads, bakeries, or industry being in the vicinity..

LOL at the OP. I guess he doesn't understand that CO2 is a gas and doesn't just plop out of the tank and sit beside your plants when you turn it on

no person is born with all the knowledge in the world.

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Well it is about 1.5x as dense as typical air, and he is in a courtyard of sorts, but a small breeze will flush all that CO2 in seconds without a ceiling.. On the otherhand, 10x20' isn't impossible to cover with clear plastic, but then back to the original hand, that kills intensity quite a bit, and intensity/CO2 go hand in hand.. I'm really torn as to whether that would be beneficial or counter-productive, but considering the extra cost, and need for wiring if it doesn't exist in that area, I'd probably just let nature do its thing..