We recommend 5-7 gal pots
But just so you know, weed will grow in anything if you take care of it. Of course we’re talking about growing inside. We don’t like pots outside above ground unless you can keep your eyes on them. It’s very difficult to keep track of watering during the summer months and they dry out so fast, one missed watering will ruin your plants.
At this time I recommend using 5 gal fabric pots for ease of use. I use Smart Pots.
One may think using larger pots indoors will give you a larger plant but I’ve found that using a 5 gal pot produces the same sized plant as a 10 gal and is easy to move around etc. when growing stealthy indoors. Of course there are many other factors involved; available lumens, heat, humidity, pests, nutrients, your skill etc… that can and will affect yield no matter what size pot you use.
We are using plastic pots as a container and now using fabric pots inside them; except for seedlings and truth be told, fabric is like the magic nutrient snake oil salesmen have been fooling people with for years (no such thing-your plants only need certain nutrients and can take only so much).
Check out 5 gallon fabric grow pots for yourself; you’ll notice a difference in your plants.