Pot size?

Size yes, shape not so much... Unless you have a special need for a particular shape, but the plant doesnt care really
 
The final pot size effects the overall yield. Generally speaking larger final pots helps increase a yield.

Personally speaking, I start my plants in one gallon pots and then transplant them into five gallons
 
I have used up to 15 gallons for plants I vegged for 3 to 4 months, depending on size/strain. Mostly 5 gallons is enough for 2 months or less veg time. For 3 weeks veg time you won't even use all of 3 gallons but when growing organic if you want water only it's great to use large planters.
 
Pot size does greatly affect yields yes. Pot shape not so much. But if your trying to fit as many pots in a certain amount of space, then you will get more plants with square pots vs round. Of course this really only works for a large grow room. If it's a small tent then really it doesn't matter.
 
A bigger pot size will give you more root mass. More root = more fruit

Also, pot dimensions seem to directly reflect on the root/foliage growth relationship.
I notice when i use short wide pots, i get shorter wider plants but using a narrow and long pot will give me a stretched plant.
 
When you get conflicting answers to a question I suggest you look at experience and time in the game.

I use pot size, shape, everything to manipulate my plants to meet my needs. If I want a single-cola plant I will use a tall skinny pot (Ihave some 3 gallon pots that are 19 inches tall). If I want my indicas to be short and bushy I use a 3 gallon pot just 8 inches high and 12 inches wide. Mother plants need larger wide pots that will induce more side-branching to use as potential clones. Just about every aspect of dirt-growing can be manipulated by timing your transplanting and choosing the proper pot for the job.

Good luck, BigSteve.
 
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