Dischidia ovata

Watermelon Dischidia is a climbing epiphytic herbaceous perennial in the dogbane family (Apocynaceae). It is native to wet tropical areas of New Guinea to North Queensland, Australia, and thrives in shaded and humid conditions. Its common name originates from its resemblance to a watermelon rind. This plant is a small, delicate, cascading vine that trails or climbs and has small, thick, waxy, oval green leaves with a silvery-like striped variegation. The leaves will have a pinkish-reddish tinge when exposed to bright sunlight. Watermelon Dischidia is both epiphytic and lithophytic and will cling to surfaces as it grows.  Its flowers are small white or cream-colored and inconspicuous. The plant will grow 2 to 3 inches tall and spread 2 to 3 feet. This plant is closely related to plants in the Hoya genus.

This plant prefers humid and well-ventilated conditions and bright, indirect light. Direct sunlight will scorch its leaves. It thrives in moist, well-drained, porous soils that will provide good air circulation for its roots. A soil mixture that contains some perlite, vermiculite, coconut husks, or sphagnum moss will provide good drainage. The plant is very sensitive to overwatering. Humidity levels should be 60 to 80% and temperatures between 65 to 85 degrees Fahrenheit. Drafts and sudden temperature fluctuations should be avoided. Repotting is suggested every 2 to 3 years or as the plant outgrows its container. Stem cuttings are the easiest method of propagation. 

The striking foliage and trailing or climbing habit make the Watermelon Dischidia a perfect houseplant for hanging baskets or trellises to create vertical interest. It may also be placed on a shaded patio or shaded outdoor spaces in warmer climates. It is best practice to wear gloves when handling this plant because its milky, white sap may cause skin irritation. Reportedly, the sap may also be toxic if ingested; therefore, exercise caution in the presence of small children or pets. 

Insects, Diseases, and Other Plant Problems:  Monitor for mealybugs, spider mites, and scale insects. Overwatering or poor drainage may cause root rot. Leaf spots may occur in humid conditions or from wetting the leaves when watering. Leggy growth occurs from inadequate light. Leaf drop may be caused by sudden changes in temperature, humidity, or watering pattern.