Hydrangea macrophylla ‘Gertrud Glahn’
synonym: H. m. ‘Gertrude Glahn’ (incorrect spelling)
Bred by F. Matthes, Germany, in 1923.
Hydrangea macrophylla ‘Gertrud Glahn’ is a medium-sized shrub with large flowerheads. Flower colour can be pink or light blue depending on soil conditions. The flowering period is June to August.
Inflorescence: Mophead, 140mm across, bright pink or light blue.
Colour in neutral soil: Pink
Colour in acidic soil with Al present: Light blue