Hydrangea macrophylla ‘Alpenglühen’ is one of the best ‘reds’ as it resists blueing in acid soils. With deep red mophead flowers, this shrub will do well in sun or shade if kept moist. Suitable as a solitary shrub or plant in groups or even as a hedge.
Inflorescence: Mophead, 170mm across. Possibly the most reliable red-flowering cultivar in this species, but can turn to mauve or purple in extremely acidic soil.
synonym: H. m. ‘Forever Pink’, ‘Alpengluhen’ translates to ‘Alpen Glow’. Considered by some to be different from ‘Glowing Embers’.
Bred by Brügger, Germany, in 1950.
Zones: 6 to 9
Size: Medium (to 1.25m).
Color in neutral soil:
Very deep pink, almost red.
Color in acidic soil with AI present:
Mauve to purple.
Ray florets: 3-5 sepals, entire, acuminate, overlapping, 35mm diam.
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. 140mm l x 90mm w.