That ain't true...i had a 2 gallon container...and i still ended up with a 6 foot bitch. It is strain dependant on how tall it will grow.The rule of thumb is 1 foot for every gallon so a 3 gallon i would veg to 2 ft then start your 12/12 by the time the plants are done they should round 3 ft. If you grow too big your plant will be more likely to get stressed out.
i grew 6 ft plants in 3 gal pots but it dont mean that they wouldnt be happier and have a higher yeild than the smaller pots. In my last grow i put a mj in a 9 gallon pot just to see if it made a difference i had 9 oz of it wen the ones in 3 gallons had a yeild of 4 oz or less. The overall vigor of the plant in the 3 gallon failed to caompare with the 9 gallon pot and they were the same agethat ain't true...i had a 2 gallon container...and i still ended up with a 6 foot bitch. It is strain dependant on how tall it will grow.
And the general rule of thumb is that a plant will stretch 1-4x the plants veg height!
I didn't say anything about yield...just rather making a point that it won't matter the size of pot you grow in...the plant will always stretch, and depending on genetics, it could stretch alot.i grew 6 ft plants in 3 gal pots but it dont mean that they wouldnt be happier and have a higher yeild than the smaller pots. In my last grow i put a mj in a 9 gallon pot just to see if it made a difference i had 9 oz of it wen the ones in 3 gallons had a yeild of 4 oz or less. The overall vigor of the plant in the 3 gallon failed to caompare with the 9 gallon pot and they were the same age