Viet, "I have 5 of them in the permanent location and they are doing great." Which trees have done well using your technique? Usually I do not make a giant transition like 4" to 5 gal. I did do it with 'Oridono nishiki.' It has grown more lushly than any other tree I care for. I thought the more vigorous cultivars take advantage of the space because of their robust nature. Same experience with 'Matsugae.'