Japanese hydrangea vine is a deciduous, woody-stemmed, climbing vine which is valued for its toothed, heart-shaped, deep green leaves and large, flat-topped, lace cap hydrangea-like clusters of white flowers which bloom in early summer. Foliage turns yellow in fall. Attaches to and grows up flat vertical surfaces such as masonry walls by stem-borne adhesive rootlets. Reddish-brown stems provide some interest in winter. Best grown in rich, medium wet, well-drained soil in part shade to full shade. Prune in late winter to early spring.