As I have grown older I have become more in tune with older things ... distressed finishes on pots and galvanised buckets, ancient lumps of wood, discarded…
Either cut the old stems down to the ground in winter, or leave in situ to be dusted by frost in the winter and remove in early spring, as the new growth appears.
By division in early spring or autumn, or by softwood cuttings in early summer.
Pests, diseases or disorders
Powdery mildew is common and aphids may be a problem.