Hydrangea macrophylla ssp. serrata ‘Intermedia’
synonyms: H. japonica ‘Intermedia’, H. serrata ‘Acuminata’
Origin Japan, before 1860. Native to Korea and Japan.
Hydrangea serrata ‘Intermedia’ is unusually vigorous and easily grown. Its decorative value is not very high compared to other cultivars, as the ray florets twist over and face the ground immediately after pollination.
Inflorescence: Lacecap, 150mm across, with white sepals which turn crimson before inverting.
Colour in acidic soil: White, aging to crimson
Colour in neutral soil with Al present: White, aging to crimson (no change)
Ray florets: 3 or 4 sepals, rounded, serrated, overlapping, 35mm diam.
Zones: 6 to 9
Size: Medium (to 1.5m).
Leaves: Mid-green turning burgundy in autumn, serrated, acuminate with elongated tip, 130mm l x 70mm w.