How to Propagate hydrangea 'Last Post'?
Propagate by softwood cuttings in early summer, or by hardwood cuttings in winter

hydrangea 'Last Post' · Hydrangea paniculata 'Last Post'
Grow in moist but well-drained, humus rich soil, in sun or part-day shade. Mulch in spring, and provide shelter from cold, drying winds. See shrubby hydrangea cultivation for more detailed advice
Propagate by softwood cuttings in early summer, or by hardwood cuttings in winter