I know that allot of people used to say a gallon for every month. is it better to use a smaller pot so there is more of a root zone or a larger one so they don't dry out as fast?
the circumference of your container is in direct relation to the circumference of your plant.
although trees can be grown in cups it becomes increasingly more difficult to deliver necessary resources
in a timely manner unless automated. 2 to five is ideal to finish in indoors I think