How to Water Hydrangea involucrata?
Consistently moist root zone, add extra water during warm dry weather

Hydrangea involucrata · Hydrangea involucrata
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
Consistently moist root zone, add extra water during warm dry weather