How to Fertilize hydrangea 'Sandra'?
Apply an acid-forming hydrangea fertilizer every 3–4 weeks from spring to summer.

hydrangea 'Sandra' · Hydrangea macrophylla 'Sandra'
Grow in a moist but free draining, neutral or acid soil in partial shade or sun.
Apply an acid-forming hydrangea fertilizer every 3–4 weeks from spring to summer.