[Overview]
A climbing perennial whose stems often become woody.
A white milky sap comes out when the stems or leaves are damaged.
The leaves are simple and opposite or whorled, with a glossy upper surface and entire margins.
The flowers are borne in racemes arising from the leaf axils or the stem tips.
The flowers are funnel-shaped, with 5 lobes at the tip.
The fruit is a follicle, and the seeds are hairy.
[Cultivation]
Propagate by cuttings.
Cut a piece with about 2 nodes, wash off the white milky sap by rinsing the cut end in water or soaking it right away, and then insert it.
At 15–20 °C, roots form in about a month.
For overwintering, it is best to keep it at 10 °C or higher, and potted plants are brought indoors into a sunny place in winter.
It prefers sunny, well-drained soil.
For potted plants, water thoroughly from spring to autumn when the soil surface dries, and keep it on the dry side in winter.
For plants in the ground, rainfall is sufficient.
In spring to summer, apply slow-release fertilizer about once a month.
Pests and diseases include aphids.
