Cynanchum japonicum

Family: Asclepiadaceae

What it is like

Cynanchum japonicum is a PERENNIAL CLIMBER growing to 0.6 m (2ft). It is in flower from May to June. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Height (m): 0.6

Where it is found

Thickets and grassy slopes near seashores, C. and S. Japan.

E. Asia - Japan.

Conservation Status:

Countries/locations it is found in

How it is used

Food

Rating: 0

Medicine

Rating: 2

The plant is antitussive and expectorant. (The part of the plant used is not specified.) A decoction is used in the treatment of lung congestion, fullness of chest and sides, shortness of breath and rasping throat.

Antitussive: Prevents or relieves coughing.

Expectorant: Clears phlegm from the chest by inducing coughing.

Other

Rating:

How it is grown

We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it could succeed outdoors in many parts of this country. It probably does not have any special cultivation requirements and will probably succeed in most soils in a sunny position.

Propagating it: Seed - sow spring in the greenhouse. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Division in spring.

Best place to grow: Woodland Garden Sunny Edge; Dappled Shade; Cultivated Beds;

Habit: Perennial Climber

Hardiness:

Growth:

Soil: Light (sandy), medium, heavy (clay)

Shade: Semi-shade, no shade

Moisture: Moist

Things to keep in mind

There are some reports of toxins in this genus.

Its other names

Local names

Synonyms

C. grayanum. Vincetoxicum japonicum.