How to Propagate Spiraea nipponica?
Propagate by softwood or semi-ripe cuttings in spring to late summer or hardwood cuttings in winter

Spiraea nipponica · Spiraea nipponica
Grows well in most moist soils, tolerant of all but the most extreme conditions, in full sun or light shade. Especially suitable for large borders and woodland planting
Propagate by softwood or semi-ripe cuttings in spring to late summer or hardwood cuttings in winter