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I start with the smallest I could get, let them go till I can see roots out the bottom, then transplant to a couple inches up... I usually go from smallest to 6" then to 10" as needed.
3 to 5 gal should be good. depends on how long you veg. larger pots for longer veg. i do a 4 week veg in 5 gal pots with about 4 gals worth of soil. no transplanting either, just rockwool clones right into 5 gals.
I remember reading somewhere that as a general rule, for each gallon of pot size the most plant height you can get is 2 feet. So a 1 gallon pot can produce a 2 foot high plant, and a 2 gallon pot can produce a 4 foot high plant, a 3 gallon pot a 6 foot tall plant, etc. But that is pushing the limits of each pot, they'll get rootbound. As MedGuy510 said, a 3 to 5 gallon pot should be more than enough for an indoor soil grow.
sorry Bangkok but i would disagree.. Height depends on light and other factors and absolutely not on how much soil space the roots have.
I have flowered in a 1 gal pot and veg for 2 to 3 weeks and it's got bud.
I would say though that the more soil you have, the more but your plant will have. I'm not sure on the science but for this grow i had 2 plants in 3 gal pot and 2 plants in 1.5 gal pots. The 3 gal pots gave more yield althought the smaller gallon pots produced trichomes much earlier... but had less yield. I do think though that if you are an expert, you can have very good success with smaller pots but since this was my first time flowering in such a small pot, it didn't yield as much as the other.. hope i helped
Usually if you use more soil, your plant will get bigger...
Common sense guys...
It just really depends what type/size of grow you are doing. There are plenty of factors to consider when choosing what size pots to use and in what time of the growing cycle...
If you have the room, go as big as possible. Even if you are not growin huge plants, use the biggest size pot that will fit in your floor space. From my experience, the more space for roots, the more growth above ground.....direct correlation. Feeling hesitant or that big pots will just be overkill? Try a side by side, one plant in a 3-5 gallon pot and one in a 10 gallon, I think the results will show you what I mean. Be wise to your roots!!! But I am a little biased!!
I go from cube to 2 liter pots then _______into 14 ltrs _______ into 12/12 average yield 120g bone dry Blueberry original with which I got from Amsterdam.. 10 yrs ago .
Good luck
The doctor.