This semi-upright growing, non-registered cultivar which is a form of H. montana is from Japan. A large size plant, it grows to around 20 inches in height. It has blue-green foliage that changes to dark green as the season progresses. The leaves are moderately wavy, cupped and have a long petiole. They have thick substance and are whitish on the bottom side. Lavender flowers bloom from July into August.

'Cho' means long, 'Dai' means large