How to Fertilize Hydrangea paniculata 'Shikoku Flash'?
Hydrangea feed in spring and again early summer

Hydrangea paniculata 'Shikoku Flash' · Hydrangea paniculata 'Shikoku Flash'
Thrives in humus rich soil, that is consistently moist but not waterlogged. Position in sun or part-day shade; in warmer areas, plants may benefit from shade from hot afternoon sun. Mulch in spring, and provide shelter from cold, drying winds. See shrubby hydrangea cultivation for more detailed advice
Hydrangea feed in spring and again early summer