Smilax nipponica

Smilax nipponica belongs to the Smilacaceae family. Its native range spans China and temperate East Asia. Plants For A Future lists Japan, Korea, and Taiwan within that range. It grows in mountain meadows and thickets in Japan. In China, it occurs in forests and on grassy slopes. It also grows in damp ground beside streams. These Chinese habitats lie at 656–4,593 feet [200–1,400 metres]. It is not native to Britain or Ireland.

Plants For A Future describes a perennial climber reaching 6.6 feet [2 metres]. Kew's WCVP data instead records an annual life cycle. The supplied sources thus disagree on how long plants live. They give no species-level detail on bark or leaf shape. The RHS page describes the wider genus, not this species. Those general traits do not establish this plant's appearance. Its climbing form is the clearest species-level guide to its garden shape.

Flowers appear from April to May, according to Plants For A Future. Male and female flowers grow on separate plants. A lone plant cannot fertilise itself. Both sexes must grow together for seed production. Seeds ripen from August to September. The fruit consists of blue-black berries about a quarter-inch across. The evidence does not describe the flowers' colour or scent. Nor does it identify which animals pollinate them.

Plants For A Future places this climber at woodland edges. It lists both sunny sites and light shade as suitable. Its profile says the plant prefers moist soil. It also lists sandy, loamy, and clay soils as suitable. The listed pH range runs from mildly acid to mildly alkaline. Yet its care notes draw on the genus's general needs. These are not firm results from trials of this species. British winter hardiness remains unconfirmed in that account.

Plants For A Future lists leaves and young shoots as food. They can be eaten raw or cooked. It also records cooked roots as edible. Dried roots can provide flour for mixing with cereals. The source gives the plant an edibility score of three out of five. It records traditional root remedies for spasms and digestive gas. These records do not establish medical benefit or safe doses. It reports no known hazards, but offers no pet-safety assessment. The supplied evidence names no specific pests or diseases.