Hydrangea macrophylla ‘Blue Danube’
synonyms: H. m. ‘Blaue Donau (German), H. m. ‘ Danube Bleu’ (French)
Probably of German origin (details unknown)
Hydrangea macrophylla ‘Blue Danube’ is a small shrub with large flowerheads. Ideal for growing in a container.
Inflorescence: Mophead, 180mm across. These photographs would indicate a deep pink flower colour but Hydrangea macrophylla ‘Blue Danube’ can be the darkest of blues in acidic soil.
Colour in neutral soil: Deep pink
Colour in acidic soil with Al present: Rich, deep blue
Ray florets: 4-5 sepals, entire, rounded, overlapping, 45mm diam.
Size: Small (to 1m).
Leaves: Simple, opposite and deciduous. Dark green. Broadly ovate to broadly elliptic. Margin: serrate. Apex: apiculate. Base: attenuate. Venation pattern: pinnate. Texture of adaxial and abaxial surfaces: smooth, glabrous, glossy. 150mm l x 90mm w.