How to Fertilize hydrangea 'Sterilis'?
Balanced diluted shrub feed monthly spring up until early autumn months

hydrangea 'Sterilis' · Hydrangea arborescens subsp. discolor 'Sterilis'
Also known as: tree hydrangea
Grow in moist but well-drained, humus rich soil. Mulch annually in spring. See shrubby hydrangea cultivation for more detailed advice
Balanced diluted shrub feed monthly spring up until early autumn months