Hydrangea serrata ‘Diadem’ is an early flowering lacecap which reliably breaks into flower by the end of May in our BC lower mainland gardens (zone 8).
Inflorescence: Irregularly-shaped lacecap, 70mm diam. Suitable for growing in pots.
Bred by Michael Haworth-Booth, UK, circa 1950.
Synonym: H. s. ‘Hoshikuzu’. Other possible synonyms include H. s. 'Hidcote Pink/Blue' and H. s. 'Koreana'.
Zones: 6 to 9
Size: Small (to 1m).
Color in neutral soil:
Color in acidic soil with AI present:
Ray florets: 4 sepals, entire, overlapping. 30mm diam.
Leaves: Yellowy-green, ovate with acuminate tips, 100mm l x 40mm w.