>> Maybe ok for some perennials and not so good for annuals?
I've heard blood-chilling advice about how root-pruning is "good for" many plants, and is the only solution to pot-circling totally root-bound plants. Someone posted a photo where he chopped off a third of a root ball and tore the rest up (well, he unraveled it), and it survived.
I plan to be more aggressive this year about unraveling hopelessly dense root balls ... and as always, try to find time to plant them when they NEED to be planted!
