If the pot is to big for the plant it will be difficult for the bottom to dry out which can lead to ph problems and yellowing of the plants. There are many different stlyes to grow with. How big or small do you want the plants to finish? Basically I say under a foot one gallon. Some people use smaller then that. I would say get a solid root structure to keep the plants from stretching first but it all depends on different variables. Can I ask what you are working with and your goals. I think you are refering to soil but well tell me more.

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