Hoya kerrii (Wax Hearts)

Hoya kerrii, commonly known as Sweetheart Hoya, Valentine Hoya, or Lucky Heart Plant, is a slow-growing evergreen climber native to Thailand, Laos, Cambodia, Vietnam, southern China, and the Indonesian island of Java. A member of the Apocynaceae family, it is one of the most recognizable Hoyas thanks to its thick, nearly circular heart-shaped leaves, which have made it a popular Valentine's gift. In nature it climbs tree trunks in warm tropical forests, using aerial roots to anchor itself and absorb moisture from the humid environment. Mature vines can reach 10 to 13 feet (3 to 4 m) in length, although container-grown plants usually remain much smaller.

The thick, succulent leaves act as water reservoirs, helping the plant withstand occasional dry periods. Established plants produce clusters of small, star-shaped flowers, usually with creamy white to pale yellow corollas and reddish to pink centers. The blooms are long-lasting, often lightly fragrant, and rich in nectar. Like many Hoyas, this species grows best in bright, indirect light, a very well-drained potting mix, and moderate watering after the soil has partially dried. Single rooted leaves are often sold as novelty plants, but only cuttings that include a stem node can eventually develop into full vines. Hoya kerrii is well suited to hanging baskets, trellises, and containers, although its slow growth requires patience. Hardy in USDA Zones 10-11, it is commonly grown indoors or as a patio plant in cooler climates. Variegated cultivars with cream or yellow leaf markings are also popular among collectors.