What size pots should i use?

I use my own compost mix for all of my grows and the plants seem to grow through it very easily but I think my pots are small. I thought 2 gal pots would be big enough but after about 3-4 weeks from seed a notice ALOT of yellowing. I couldn't figure it out until I looked at the bottom of my pots and notice massive amount of roots protruding from my pots. The roots looked like they were turning brown. I quickly transplanted them outside and it fixed the problem. So what size pots should I use for my inside grow? 2 gal pots are too small for a full cycle, so I'll keep them for my clones to go into flowering right away. I have a 4.5 by 4.5 area and I think I should just go strait to 5 gal pots just to make sure it will have plenty of space. where can you purchase cheap 5 gal pots online?

get 15 litre's they are perfect for medium sized plant's indoors

or you can go with 12 , but there only good for little plant's

My 3 gallon smartpots seem to be fine for a 3ft Tall Indoor lady.
The air pruning does a root system good.

7 gallon smart pots on sale on Amazon for $9. Good pot for pot. Peace

ye you need a bigger 18 to 30 liters or 5 or 7 gallon will be more than fine, or round there, but you 100 percent its nothing else apart from root bound stress,symptoms eg yellowing of the bottom leafs or a regular basis as there sacrificed for new growth,(this tends to be more aggressive in flowering or as the plant matures , having to run low ppm/ec's, plants burning on really low ec levels, increased watering, when it happened to me in coco, it just turned me into a hydro pump on a timer 5 to 6 times a day lol. Are you noticing slightly more vertical growth, plants tend to go up rather than out when root bound or root bound sort of speak, as ive grown monster in 2 gallon pots, but suffered all the above

I've got about the same sized area you got and 4 5 gallon pots are all that will fit under my 600w. Using these pots which I found at a hydro shop for $3, they are sturdy and have a good lip to grab onto when picking them up

http://1000bulbs.com/product/91054/GROW-HG5PHD.html?utm_source=SmartFeedGoogleBase&utm_medium=Shopping&utm_term=GROW-HG5PHD&utm_content=Plastic+Pots+and+Containers+-+Round&utm_campaign=SmartFeedGoogleBaseShopping&gclid=CLfkp56c_7YCFaYWMgodFVcAAQ

I use 5 gallon. But 7 would not hurt. Bigger pots bigger plants

That's what I'm talking about.

Are the smart pots really better than the plastic ones and if so how. Also would 5 gal smart pots be the best for my space and root system? Thanks for all the help.

What size pots should i use?

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ok I used to think that big pots big plants and this is true if you feed with nutes 1-2 a fortnight(soil nutes). If you feed with hydro nutes every watering 6.5ph'd ,5-7 days a week you can have 3-4 foot flowering plant in a one gallon pot. You need to water this much as pots dry daily which is ideal for health of root sytems. When roots don't have to reach for food/water they don't grow much allowing you to keep them in the small pots till the end avoiding transplant shock ,over watering,droop etc.