When to CO2

When is most beneficial to add CO2, during veggie or flowering.
If I could only put it in one room I'd put it in flower room.
Your buds are going to benefit most. What temp are you running.
 
Thanks all of you for your input. I am going to grow White Widow Auto Fem. But just decided to keep them in my grow room with no CO2 until the flowering starts, then I am taking them outside. I know I will be paranoid at times, but is at the back yard hidden and I don't get many visitors. Besides, White Widow auto fem don't grow that tall, so that helps.
 
Your looking at an enclosed system with multiple variables you must control or the benefits will not probably/never materialize to offset the expense of the investment. White Widow is awesome, just finished with auto grow last fall, good choice, nice flavors and the heavier the amber trics the farther down your eyelids go lol GG
 
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