How to Fertilize hydrangea 'Libelle'?
Hydrangea feed in spring and again early summer

hydrangea 'Libelle' · Hydrangea macrophylla 'Libelle'
Grow in moist but well-drained soil in partial shade but sun is tolerated if soil remains reliably moist; acid soils with pH of less than 5.5 produce blue fertile flowers and soils with a pH of more than this produce pink fertile flowers. White ray florets are not affected by pH
Hydrangea feed in spring and again early summer