How to Fertilize hydrangea 'Red Beauty'?
Hydrangea feed in spring and again early summer

hydrangea 'Red Beauty' · Hydrangea macrophylla 'Red Beauty'
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
Hydrangea feed in spring and again early summer