Plant in moist, fertile soil and do not allow the soil to dry out while the plant is getting established. This hydrangea flowers on the previous season’s wood, so if you need to prune it back, do so in late autumn or early spring, but drastic pruning may restrict flowering the following year. It does best in shady areas of the garden. Showy, lacy, white flowerheads appear in late spring and early summer.
H. petiolaris comes from Japan, Korean Peninsula, Sakhalin Islands and Siberia. Schizophragma hyrdangeoides
A vigorous, sprawling, deciduous, woody vine that clings and climbs by twining and aerial rootlets along the stems, typically maturing over time to 10 metres. It also has a tendency to grow branches at 90 degress to the supporting structure. Fragrant white flowers in flat-topped clusters (to 20cm wide) bloom in late spring to early summer. An added bonus is that during winter stems are exposed revealing exfoliating bark of a reddish brown colour.
We are just not quite sure what we have growing in our garden. Further investigation will need to be undertaken. It may be that the plant is acrually Schizophragma hydrangeoides. The next flowering season will tell us what it is because in the flower heads of Schizophragma it has one solitary heart-shaped sepal. Hydrangea has 4 sepals.