Hydrangea macrophylla ‘Altona’ is a free-flowering, medium-sized shrub with noticeably serrate sepals. Suitable for growing in containers.
Inflorescence: Mophead, 220mm across. As the season progresses, flower colour can change from blue to purple regardless of soil acidity.
Bred by Heinrich Schadendorff, Germany, in 1931.
Zones: 6 to 9
Size: Medium (to 1.25m).
Color in neutral soil:
Color in acidic soil with AI present:
Ray florets: 4 sepals, serrated, overlapping. 45mm diam.
Leaves: Simple, opposite and deciduous. Broadly ovate to broadly elliptic. Margin: serrate. Apex: apiculate. Base: attenuate. Venation pattern: pinnate. Texture of adaxial and abaxial surfaces: smooth, glabrous, moderately glossy. 160mm l x 110mm w.