Coptis japonica

Physical Characteristics

Coptis japonica is an evergreen Perennial growing to 0.2 m (0ft 8in) by 0.5 m (1ft 8in). See above for USDA hardiness. It is hardy to UK zone 7. It is in leaf all year, in flower in May. The species is hermaphrodite (has both male and female organs). Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Distribution

E. Asia - Japan.

Habitats

Woodland Garden Dappled Shade; Shady Edge; Ground Cover;

Edible Uses

None known

Medicinal Uses

Antibacterial Antiinflammatory Dysentery Stomachic The root is a pungent, very bitter, cooling herb that controls bacterial and viral infections, relaxes spasms, lowers fevers and stimulates the circulation[238]. It is locally analgesic and anaesthetic[238] and is also anti-inflammatory and stomachic. It is used in the treatment of intestinal catarrh[4, 61, 174], dysentery, enteritis, high fevers, inflamed mouth and tongue, conjunctivitis etc[238]. The root is harvested in the autumn and can be used fresh or dried[238].

Known Hazards

Although no specific mention of toxicity has been found for this species, it belongs to a family that contains many species that are mildly toxic and so it is wise to treat this plant with some caution.