Hydrangea involucrata is a small, fascinating, relatively rare, member of the hydrangea genus. The flower buds, fully enclosed in involucral bracts, open with white ray florets surrounding bright mauve fertile flowers.
Inflorescence: Lacecap, 80mm across. Exquisite, intensely coloured small flowerheads.
Imported from Japan to Europe by Philip Franz von Siebold (1796-1866).
Synonyms: the Japanese name ‘Tama Ajisai’.
Zones: 8 to 9
Size: Small (to 1m).
Color in neutral soil:
Bright mauve fertile flowers surrounded by white ray florets.
Color in acidic soil with AI present:
Involucral bracts enclose the flower bud.
Ray florets: 5 sepals with acuminate tips, entire, wavy edges, overlapping, 20mm diam.
Leaves: Pointed, slender, bristly (like suede) – similar to H. aspera, but small 70mm l x 20mm w.