Hydrangea macrophylla ‘Hanabi’ is a vigorous shrub, sometimes exceeding 2.5m. It differs from all other varieties of hydrangea by its extraordinary flat inflorescences measuring up to 250mm. These lacecap flowers comprise double ray florets and double true flowers, all of which can be white, pale pink or pale blue depending on soil conditions.
If placed in a shady position with insufficient sun we have found H. m. ‘Hanabi’ reluctant to flower.
Inflorescence: Lacecap, 250mm across. Very confused flower with leaves growing from the peduncles and some ray florets appearing amidst the fertile flowers.The pendulous double ray florets dangle from long pedicels. The true flowers are also double.
synonym: ‘Shooting Star’, ‘Fireworks’, ‘Vuurwerk’, ‘Feu D’Artifice’, ‘Sumida no Hanabi’. Some consider ‘Fuji Waterfall’ to be a synonym of ‘Hanabi’.
Discovered and named by Takeomi Yamamoto, Japan, in 1960.
Zones: 6 to 9
Size: Tall (to 2.5m).
Color in neutral soil:
White with pink true flowers.
Color in acidic soil with AI present:
White with pale blue true flowers.
Ray florets: 12-14 sepals, entire, slightly acuminate, overlapping, 40mm across.
Leaves: Simple, opposite and deciduous. Broadly ovate to broadly elliptic. Margin: serrate. Apex: apiculate. Base: attenuate. Venation pattern: pinnate. Texture of adaxial and abial surfaces: smooth, glabrous, moderately glossy. 140mm l x 60mm w.