Hydrangea sargentiana (central China)
(= H. aspera ssp. sargentiana)
Habit: Extended, upright, impressive normal shrub with thick shoots and few branches, domed; 2 m tall and wide, slow-growing.
Flowers: Plate-shaped, 15-20 cm long inflorescences on one-year shoots, marginal shoots, inner flowers light violet, bluish when withering; very persistent from July to August.
Leaves: Conspicuously large, with tassels, broadly ovoid leaves; 20-40 cm long, velvety dark green, no autumn colours.
Demands: Light shade to semi-shade, needs warmth, sensitive to frost, shoots after damage; needs wind protection.
Soil: Nutritious, acidic-humic to acidic sandy-loamy substrates, fresh to moist, sensitive to drought.
Hardiness: Zone 6a