Hey there Another Margaret – Do you believe your Rose of S. is younger? (2-3years) As they get older their root systems get pretty deep. You can move it now – they are adaptable. I would imagine it is beginning to show signs of life yes?
IF you want to practice patience – wait till fall…kind of a good rule to follow for most tree’s and shrubs.
I work and learn in a nursery (as well as on the side) in the zone 5 area code so I get to learn about how they grow in pots as well as in the ground. I transplanted a Rose of Sharon last year, in the beginning of the season – and all is well this year and last!