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.
synonym: H. m. ‘Gertrude Glahn’ (incorrect spelling)
Bred by F. Matthes, Germany, in 1923.
Zones: 5 to 9
Size: Medium (to 1.5m).
Color in neutral soil:
Color in acidic soil with AI present:
Ray florets: 3, 4, or 5 sepals, rounded or with slight serrations, overlapping, 45mm diam.
Leaves: Typical H. macrophylla leaf, rich green, heavily serrated, 110mm l x 75mm w.