How to Fertilize hydrangea 'Heinrich Seidel'?
Hydrangea shrub feed every four weeks spring through early summer

hydrangea 'Heinrich Seidel' · Hydrangea macrophylla 'Heinrich Seidel'
Best grown in moist but well-drained soil in part shade although tolerant of sun if soil remains moist. See shrubby hydrangea cultivation for more detailed advice
Hydrangea shrub feed every four weeks spring through early summer