Answer: You can transplant hostas now, but expect the foliage to wilt and look puny for the remainder of the season. Or, you can dig and transplant them in early spring, just as they begin leafing out.
It is a bit late in the season to cut your privet hedge back. Pruning encourages a flush of growth which may not have time to fully harden off before first frost. If possible, wait until early spring to do your hedge pruning.
Rose of Sharon is by nature a large shrub. You can prune to keep it at about 6' if you start early in the season and do some selective pruning throughout the summer months. Since it blooms on new wood, pruning it back each spring will encourage lots of new flowering stems.
Best wishes with your landscape!
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