Hydrangea involucrata var. izuensis ‘Oshima’

Collected on the Japanese island of the same name, this represents a large growing form of the species, potentially reaching 4m tall under ideal, i.e. humid and semi-shaded conditions. The foliage is slightly thicker and hairier and the lacecap heads of flower are produced late in the season in August and September, being lavender blue with white ray florets.