How to Prune rose of Sharon?
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.

rose of Sharon · Hypericum calycinum
Also known as: Aaron's beard; large-flowered St John's wort; Resurrection plant
Grows well in moist but well-drained soil in sun or partial shade. Ideal for under trees. May have the potential to become a nuisance if not managed well
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.