On 11 Jan 2013, mj wrote in rec.gardens:

I have 2 pretty big Rose of Sharron plants I would like to move.
They are over 5 feet tall and have been the ground about 5 years.
Can I get enough of the root structure to move them or will I just
kill them? Also when would be the best time to do this, I am
assuming before they leaf in the spring? Thanks in advance for and
advice. MJ

I don't really know, and this is not at all scientific, but I have a
Rose of Sharon that is at least 15 years old that I've cut back to
within a couple of feet of the ground 3 or 4 times... and it springs
back with astounding vigor every time. The thing seems to be
unkillable! If I ever needed to move it, I wouldn't hesitate.