How to Propagate Himalyan tree hydrangea?
Propagate by softwood cuttings in early summer

Himalyan tree hydrangea · Hydrangea aspera subsp. robusta
Also known as: robust hydrangea
Grow in moist but well-drained soil in partial shade or sun if the soil remains reliably moist. See shrubby hydrangea cultivation for more detailed advice
Propagate by softwood cuttings in early summer