Seedling pot sizes....

JoNny Pot sMokeR said:

I agree with you to a certain Point I grow out doors and i know that a plant can easily reach 4 to 6 ft in the ground with circumfrence of about the same. A 5 gal bucket is far from that. so if you transplant 2 times then you can kinda control the way your roots grow, and prevent getting root bound. If you put a seed in a 5 gallon pot and let it go you will be well root bounded by the time you even go in to flower. I know from experiance. i just up sized pots today for the 3rd time. and im showing no signs of stress or droopage. it also gives you a chance to see what your roots are doing and if they are healthy or not.

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If your girls are thriving under your regimen, Great! Go for it. I farm in 10 gallon containers, even my 12 foot+ Sativas have never bound up in those tubs.
I will ALWAYS start my DRY seed in a peat or coconut cup. At the third set of leaves, they go into the 10 gal. tub and DONE! NO stress, no strain, and no reason to complain! It's ALL good, lol........BB

That's just ridiculous Let's count. One, two, three, four. Four. You transplant a minimum of 4 times before flower. It may be your way, it may work for you, but it's some of the worst advise you could give to a new or fellow grower.

18 gallon? Are you growing outside eventually or throughout the whole grow? Even that I wouldn't understand.

For indoor grows 5 gal max is recommended if you're working with 7-8 foot ceilings. You can either throw the germinated seed(I would not germinate seed in 5 gal, use paper towel method) right into the 5 gal and start to finish with one container, NO TRANSPLANTING. Or, what I do is start in a square 6"x6"x6" container(I use to use solo cups but found through trial and error starting bigger is better) I throw germinated seed in one of those, veg for 3 weeks then transplant ONCE into 5 gal. Another 5-10 days in veg, or more depending how tall you want your girl then into flower. My way, my opinion. Less stress the better. Any grower or wannabe that tells you transplanting doesn't cause stress is lying. Other than cloning, transplanting is the very worst thing you can do to your plant for stress.
Another old thread I replied to before I realized it was old. lol whatever.