How to Propagate hydrangea 'Kardinal'?
Propagate by softwood cuttings in early summer or hardwood cuttings in winter

hydrangea 'Kardinal' · Hydrangea macrophylla 'Kardinal'
Grow in any moist but well-drained soil in partial shade or grow in sun if soil remains reliably moist. See shrubby hydrangea cultivation for more detailed advice
Propagate by softwood cuttings in early summer or hardwood cuttings in winter