Hoya nummularioides aka Hoya Nummularioides

Hoya nummularioides prefers bright, indirect light similar to the filtered sunlight it receives under the forest canopy in its native Southeast Asian habitat. Direct sunlight can scorch its delicate velvety leaves, but the plant needs sufficient light to encourage blooming. A spot near an east or west-facing window with sheer curtains, or a few feet back from a south-facing window, provides ideal conditions.

This tropical plant thrives in temperatures between 65-85°F (18-29°C), with an optimal range of 65-90°F. It's hardy in USDA zones 10a-11b and can tolerate brief exposure to temperatures as low as 50°F (10°C), but prolonged cold below 60°F will stress the plant. Keep it away from cold drafts, air conditioning vents, and windows during winter. Frost will cause significant damage to leaves and stems.

Yes, Hoya nummularioides is prized for its intensely fragrant flowers that bloom during summer and fall. The small star-shaped blooms emit a sweet, powerful scent often compared to honey or vanilla, with some detecting a soft spicy note. The fragrance is strong enough to fill an entire room, making this plant particularly popular for keeping near living areas when in bloom. The flowers themselves are white with pink or burgundy centers.

Hoya nummularioides produces clusters (umbels) of 7-20 tiny, star-shaped flowers primarily during summer and fall, with autumn being the peak blooming season. Each flower is about 7mm across, featuring a creamy white corolla with a deep pink or burgundy center and yellow accents. The blooms are intensely fragrant with a honey-vanilla scent. Like other Hoyas, this species can rebloom repeatedly from the same flowering stalk (peduncle), so never cut these off. Adequate bright indirect light and slight stress from being slightly root-bound encourage more prolific blooming.

Propagate Hoya nummularioides from stem cuttings, though this species can be challenging as cuttings tend to rot more easily than other Hoyas. Take 4-6 inch cuttings with at least 3-4 leaves just below a node in spring or summer. Let cuttings callous for 12-24 hours to prevent rot, then root in water or well-draining soil mixed with plenty of perlite. Keep warm and humid in bright indirect light. Water propagation allows you to monitor root development, while soil propagation (in a small pot with added perlite) has shown better success rates for this particular species.

Repot Hoya nummularioides only every 2-3 years, as this plant prefers being slightly root-bound and actually blooms better in this condition. Repot in spring or early summer when you see roots growing from drainage holes, water running straight through without absorption, or significantly slowed growth despite proper care. Move up only one pot size (1-2 inches larger) to avoid overwatering issues from excess soil. Use a well-draining mix of orchid bark, perlite, and coco husk to replicate its epiphytic nature.

Hoya nummularioides is a compact, small-growing Hoya with vining stems that typically reach 1-3 feet (30-90 cm) in both height and spread. With proper care, vines can extend to 60-100 cm in length over 2-4 years. Growth rate is moderate - the plant takes about 2-3 years to reach full maturity under optimal conditions. It actively produces new foliage in spring and summer but slows down and goes semi-dormant during fall and winter. The small, coin-shaped leaves (3-5 cm) are densely packed along slender stems, creating a full trailing appearance.

Gently wipe the small, velvety leaves of Hoya nummularioides with a soft, damp cloth every few weeks to remove dust that can block light absorption and reduce photosynthesis. Be gentle due to the fuzzy texture of the leaves. Avoid leaf shine products, which can clog the pores of the succulent-like leaves. You can also give the plant a gentle shower with lukewarm water, allowing it to fully drain afterward to prevent water from sitting in leaf axils where it could cause rot.

Common pests include mealybugs (white cottony masses), scale insects (hard shells on stems/leaves), and aphids (small sap-suckers causing sticky honeydew). Treat infestations by isolating the plant and spraying with neem oil solution, insecticidal soap, or rubbing alcohol mixed with water. The primary disease concerns are fungal issues like Botrytis gray mold and root rot from Pythium, Phytophthora, or Rhizoctonia, which occur when plants are overwatered. Ensure proper drainage and allow soil to dry between waterings to prevent these diseases.

Minimal pruning is needed for Hoya nummularioides. Trim back overly long vines in spring to maintain desired shape and encourage bushier growth. Remove any dead, damaged, or yellowing leaves as they appear. Most importantly, never cut off the peduncles (flower stalks) after blooming, as Hoyas rebloom from these same stalks year after year. Light pruning can redirect energy toward new growth and flowering, but avoid heavy pruning which can stress this slow-to-moderate growing plant.

Hoya Nummularioides presents a moderate level of care, which allows plant enthusiasts with some experience to expand their skills and knowledge.

Hoya Nummularioides’s native range is Southeast Asia and Australia.

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

Hoya Nummularioides 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.

No additional humidity is required for the Hoya Nummularioides. Plants take in most of their water through their roots, not their leaves, therefore, watering the soil is the most effective way to supply humidity to your plants.

Repotting the Hoya Nummularioides is necessary either when it has doubled in size or once every year, whichever happens first. With fresh potting soil replenished annually, the plant will receive all the necessary nutrients, rendering the use of fertilizer unnecessary. Keep in mind that the source of a plant's energy is the sun, not fertilizer.

Hoya Nummularioides is not known to cause harm to humans or pets.

The Hoya Nummularioides does not exhibit a standard dormancy pattern. If a substantial slow-down in growth is noticed, double-check that the plant is getting sufficient sunlight and water for optimal growth.