For the most tender ears, pick them one or two days after the silks emerge. A. Potting up plants into extremely large containers, especially slow-growing woody plants, is likely to cause two problems. The first concerns watering. The large volume of soil can remain wet for long periods of time leading to root rot. Second, it is difficult to be sure that the young plant is receiving the right amount of fertilizer.
Nutrients are likely to leach out of the pot before they can be absorbed by the roots.
When repotting your shrub, choose a pot that will give you roughly an inch of fresh soil on each side of the existing root ball.