rootmaker and smartpots
Who has used these air/constriction root pruning systems?
If I were to try to grow some trees for eventual planting out in them, I have questions:
1. How do you know when "it's time" to pot up? Do you do it as soon as the root branching has occurred to a point where you can see roots at the outside of the soil ball, or let them "rebranch" a couple times first? Is there a good rule of thumb?
2. Does the "4-inch rule" touted by Carl Whitcomb apply more or less to most plants?