One thing I do to keep the roots from going straight to the bottom of a pot is to transplant it at least 3 times from a 8 oz. cup to a gallon, to the biggest size pot. Not sure if this does a thing to help it grow bigger..., A bigger pot will make a bigger plant. Think about it in extreme conditions - How big of a plant are you going to get if it's kept in an 8 oz. pot?