How to Water hydrangea 'Red Ace'?
Consistently moist acidic soil, never allow root ball to dry out completely

hydrangea 'Red Ace' · Hydrangea macrophylla 'Red Ace'
Grow in moist but well-drained, humus rich soil, in a lightly shaded spot with shelter from cold, drying winds. Mulch annually in spring. Red flower colours are best maintained by growing in slightly alkaline soil, though plants may become chlorotic in strongly alkaline soils. See shrubby hydrangea cultivation for more detailed advice
Consistently moist acidic soil, never allow root ball to dry out completely