Rubber vine (Cryptostegia grandiflora) is a member of the milkweed family, originated in Madagascar. Rubber vine may be found on a wide range of soils in the tropics. It is usually found in wooded areas or along watercourses where trees provide support for its vines and the good water supply allows vigorous growth.
Rubber vine is a woody climbing plant. Its rampant growth permits it to climb over trees up to 45 feet. In the open it forms loose many-stemmed shrubs from one to two metres high.
It has fleshy, shiny, dark green leaves . They are arranged in pairs opposite each other on long smooth succulent stems. When broken the stems exude a milky sap.
It has large, showy, white to lilac flowers with a broad funnel-shaped tube and five spreading lobes. The tubular portion is sometimes tinged with red. Flowers are about 2 inch across.
Plant is poinonous
Hardy zone 10
Cover the seeds very lightly with a porous potting mixture. Keep warm and in bright light. Water, when soil is dry to the touch.