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

hydrangea 'Renate Steiniger' · Hydrangea macrophylla 'Renate Steiniger'
Grow in moist but well-drained, humus rich soil, ideally in light shade, though this cultivar will tolerate full sun if soil is not too dry. Mulch in spring, and provide shelter from cold, drying winds. Soil additives may be required to maintain specific flower colours. See shrubby hydrangea cultivation for more detailed advice
Hydrangea shrub feed every four weeks spring through early summer