How to Fertilize Himalyan tree hydrangea?
Hydrangea shrub feed every four weeks spring through 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
Hydrangea shrub feed every four weeks spring through early summer