Hoya nabawanensis aka Waxplant

Hoya nabawanensis is considered an easy species to grow, with a cultivation difficulty comparable to the beginner-friendly Hoya lacunosa. It roots readily from cuttings, grows steadily, and blooms reliably even at a young age. This makes it an excellent choice for both new Hoya collectors and experienced growers looking for a low-maintenance, rewarding species.

Hoya nabawanensis thrives in temperatures between 18–26°C (65–80°F), consistent with its tropical Bornean origins. It cannot tolerate temperatures below 10°C (50°F) and should be protected from cold drafts and sudden temperature changes. This species will tolerate slightly cooler conditions than many tropical Hoyas, but sustained cold will cause damage.

Hoya nabawanensis is a prolific bloomer that can flower at a young age — some growers report blooms within nine months of starting from a cutting. The flowers are pubescent (covered in fine hairs), with a pinkish corolla and yellow corona, arranged in typical Hoya umbel clusters of star-shaped blooms. To encourage flowering, provide bright indirect light, allow the soil to dry slightly between waterings, and avoid removing old peduncles as they can rebloom from the same spur.

Hoya nabawanensis flowers produce a very pleasant, sweet fragrance that can fill a room when in bloom. The scent is typically strongest in the evening, which is common among Hoya species as they naturally attract nocturnal pollinators. This sweet aroma is one of the reasons the species is popular among Hoya collectors.

Hoya nabawanensis propagates easily from stem cuttings. Take a cutting with at least one node, and root it in coconut husk chips, sphagnum moss, or a well-draining aroid mix. The species roots readily and is considered straightforward to propagate. Vermont Hoyas reports successful rooting in coconut husk with progressive up-potting to larger containers as the plant establishes.

Hoya nabawanensis is described as a compact growing species that develops into an attractive trailing or climbing vine. It has a moderate growth rate and is smaller in stature compared to many other Hoya species, making it well-suited for hanging baskets, small trellises, or growing along a shelf. The teardrop-shaped leaves feature distinctive silver flecks or splashes.

Two notable cultivated forms of Hoya nabawanensis are available among collectors. The 'splash' form features pronounced silver markings on the leaves, enhancing the species' natural silver flecking. An inner variegated form also exists, displaying variegation in the center of the leaves. Both forms are sought after by Hoya enthusiasts and share the same easy care requirements as the standard species.

Hoya nabawanensis can grow outdoors only in USDA zones 11–13, as it cannot tolerate temperatures below 10°C (50°F). In tropical and subtropical climates, it can be grown on a shaded patio or mounted on a tree trunk as an epiphyte. In cooler climates, it should be kept indoors year-round or brought outside only during warm summer months, always in a sheltered spot with filtered light.

Prune Hoya nabawanensis lightly to control shape and encourage bushier growth. The most important rule is to never cut off old flower peduncles (spurs), as Hoyas rebloom from the same peduncle multiple times. Strategic removal of excess vegetative growth can redirect the plant's energy toward flower production. Trim leggy stems back to just above a node during the growing season.

Repot Hoya nabawanensis when it becomes rootbound, typically every 2–3 years. Hoyas generally prefer being slightly rootbound, and a snug pot can actually encourage flowering. When repotting, move up only one pot size and use a well-draining mix such as coconut husk chips or an aroid blend. Vermont Hoyas has had success with progressive up-potting through increasingly larger containers as the plant grows.

Hoya nabawanensis is pollinated by insects in its native habitat. The fragrant, nectar-producing flowers attract insect pollinators, with scent typically intensifying in the evening. Like other Hoyas, the flowers have a complex pollination mechanism involving pollinia (pollen packets) that attach to visiting insects. Indoor plants rarely set seed without manual pollination.

The most common pests for Hoya nabawanensis are mealybugs and scale insects, which can hide in leaf axils and along stems. Spider mites may appear in dry conditions. Root rot from overwatering is the most serious disease threat — Hoyas are very sensitive to waterlogged soil. Ensure excellent drainage and allow the substrate to dry between waterings. Inspect new plants carefully before adding them to your collection to prevent introducing pests.

Yellow leaves on Hoya nabawanensis most commonly indicate overwatering or poor drainage, which leads to root rot. Check that the soil is drying adequately between waterings and that the pot has drainage holes. Other causes include too much direct sunlight, nutrient deficiency, or natural aging of lower leaves. If multiple leaves yellow rapidly, unpot the plant and inspect the roots for rot — trim any mushy, dark roots and repot in fresh, well-draining substrate.

Brown leaf tips or edges on Hoya nabawanensis typically result from low humidity, direct sun exposure, or inconsistent watering. Brown, mushy spots may indicate overwatering or fungal infection. Move the plant away from direct afternoon sun, maintain humidity above 40%, and ensure a consistent watering schedule. If brown spots are spreading, check for root health and reduce watering.

Drooping in Hoya nabawanensis is most often caused by either overwatering or severe underwatering. Check the soil moisture — if the substrate is soggy, root rot may be developing, and you should reduce watering and check the roots. If the soil is completely dry and the leaves feel thin or wrinkled, give the plant a thorough soaking. Cold drafts or sudden temperature drops can also cause temporary wilting.

Wipe Hoya nabawanensis leaves gently with a damp cloth to remove dust, which can block light absorption and attract pests. Avoid using commercial leaf shine products as they can clog the leaf pores. For pest prevention, periodically spray leaves with a dilute neem oil solution. The thick, waxy leaves are easy to clean and maintain compared to more delicate foliage plants.

Waxplant’s native range is Southeast Asia and Australia.

Waxplant does best in dry soil and should only be watered sparingly.

Waxplant loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

To ensure optimal growth, the Waxplant prefers bright indirect light for 6-8 hours each day. Insufficient light can result in slow growth and leaf drop, so it's important to find a well-lit location for this plant. Place it near a window, within a distance of 1 meter (3 feet), to enhance its potential for thriving.

The Waxplant does not demand additional humidity levels. Water is mostly absorbed by the roots of plants, rather than their leaves, and the best way to provide humidity to your plants is through watering the soil.

Once the Waxplant has doubled in size or after a year has passed, it should be moved to a new pot. By replacing the soil with fresh potting soil containing all the vital nutrients, your plant will receive all the sustenance it needs, negating the requirement for fertilizer. It's important to remember that plants get their energy from the sun, not fertilizer.

No verified data on the toxicity of this plant exists within Ploi's records. Should you, someone in your family, or your pet ingest plant material with an unknown toxicity level, it is recommended to seek medical advice.

The Waxplant does not display a conventional dormancy pattern. If the growth rate slows significantly, verify that the plant is receiving adequate amounts of sunlight and water for healthy growth.