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Plant care

Soidao Wax Plant (Soidao hoya) care

Hoya soidaoensis

Also called Soidao wax plant, Soidao hoya, Khao Soi Dao hoya.

RHS H1bUSDA 10-12Pet-safeIndoor Up to 3 m as a vine indoors with a support

Watering rhythm

10-14days

Every 10–14 days in growth; reduce to every 3–4 weeks in cooler months

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Light

Bright indirect light (just back from a sunny window)

Soil

Extremely well-draining epiphytic mix

Humidity

60–80%

Temp

18–30°C

Pet safety

Pet-safe

Mature size

Up to 3 m as a vine indoors with a support

Care at a glance

Light

Bright but filtered. Soidao Wax Plant burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright, filtered light mimicking a forest canopy is ideal; avoid harsh midday direct sun which bleaches the foliage. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering soidao wax plant: every 10–14 days in growth; reduce to every 3–4 weeks in cooler months. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water thoroughly then allow the medium to dry out almost completely before the next watering; this species is sensitive to wet roots and should never sit in a saucer of water.

Soil and pot

Soidao Wax Plant grows best in extremely well-draining epiphytic mix. Combine orchid bark, perlite, and a small amount of coco coir; a chunky, airy mix that dries quickly between waterings prevents root rot in this species. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Soidao Wax Plant sits happiest at around 60–80% humidity and 18–30°C (64–86°F). Being a Thai forest epiphyte, it benefits from consistently high humidity; use a humidifier or enclosed cabinet in drier climates, especially in winter. If you keep the room above 18–30°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed soidao wax plant sparingly. Apply a dilute balanced liquid fertiliser (half strength) monthly from spring to late summer; withhold feeding during winter dormancy. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on soidao wax plant in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Failure to flower — H. soidaoensis is considered a challenging bloomer; it requires bright indirect light, adequate humidity above 60%, and a well-established root system before it will produce flowers — do not remove old peduncles (flower spurs), as new blooms arise from the same spurs each season.
  • Root rot in dense media — Standard potting compost retains too much moisture for this species; yellowing at the base and soft, dark stems indicate rot. Repot immediately into a chunky bark-and-perlite mix and cut back on watering frequency.

Propagation

Root stem-tip cuttings containing two to three nodes in moist sphagnum moss or a perlite–bark mix; enclose in a clear bag to maintain humidity around 80% until roots appear (typically 4–8 weeks). Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Soidao Wax Plant is pet-safe. The Hoya genus is considered non-toxic to cats and dogs by the ASPCA. No toxic compounds are documented for H. soidaoensis; mild digestive upset is possible if a pet consumes large quantities of plant material. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Soidao Wax Plant care — frequently asked questions

What is the common name for Hoya soidaoensis?

Hoya soidaoensis is most commonly called Soidao Wax Plant, but it is also known as Soidao wax plant, Soidao hoya, Khao Soi Dao hoya. The names refer to the same species, so care instructions for Soidao Wax Plant apply identically to anything sold as Soidao hoya.

How much light does soidao wax plant need?

Soidao Wax Plant grows best in bright indirect light (just back from a sunny window). Bright, filtered light mimicking a forest canopy is ideal; avoid harsh midday direct sun which bleaches the foliage.

How often should I water soidao wax plant?

Water soidao wax plant every 10–14 days in growth; reduce to every 3–4 weeks in cooler months. Water thoroughly then allow the medium to dry out almost completely before the next watering; this species is sensitive to wet roots and should never sit in a saucer of water. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is soidao wax plant toxic to cats and dogs?

Soidao Wax Plant is pet-safe. The Hoya genus is considered non-toxic to cats and dogs by the ASPCA. No toxic compounds are documented for H. soidaoensis; mild digestive upset is possible if a pet consumes large quantities of plant material.

What USDA hardiness zone does soidao wax plant grow in?

Soidao Wax Plant is rated for USDA zone 10-12 (indoor in most climates) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Soidao Wax Plant deep-dive guides

Every aspect of soidao wax plant care, each with its own calibrated guide:

Featured in these plant shortlists

Soidao Wax Plant qualifies for 12 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Soidao Wax Plant is also known as Soidao wax plant, Soidao hoya, and Khao Soi Dao hoya.