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Plant care

Wonderful Wax Plant (Mirabilis hoya) care

Hoya mirabilis

Also called Wonderful wax plant, Mirabilis hoya.

RHS H1bUSDA 10-12Pet-safeIndoor Typically 1–2 m as a container houseplant when given a support or trailing from a hanging basket.

Watering rhythm

7-14days

Every 7–14 days in the growing season, monthly in winter

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Light

Bright indirect light (just back from a sunny window)

Soil

Airy, bark-based epiphytic mix

Humidity

55–75%

Temp

16–30°C

Pet safety

Pet-safe

Mature size

Typically 1–2 m as a container houseplant when given a support or trailing from a hanging basket.

Care at a glance

Light

Bright but filtered. Wonderful Wax Plant burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. A bright, east- or north-facing windowsill provides ideal conditions; too little light results in slow growth and rare flowering, while harsh direct sun causes leaf scorch. 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 wonderful wax plant: every 7–14 days in the growing season, monthly in winter. 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. Allow the potting medium to dry out between waterings; the epiphytic roots are very susceptible to root rot if kept constantly moist.

Soil and pot

Wonderful Wax Plant grows best in airy, bark-based epiphytic mix. Combine orchid bark, perlite, and a small amount of coco coir; excellent aeration around the roots is more important than moisture retention. 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

Wonderful Wax Plant sits happiest at around 55–75% humidity and 16–30°C (61–86°F). Moderate to high humidity reflects its Southeast Asian forest habitat; use a humidity tray with pebbles and water or group plants together to maintain adequate moisture in the air. If you keep the room above 16–30°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 wonderful wax plant sparingly. Feed monthly during spring and summer with a balanced liquid fertiliser at half strength; withhold feeding entirely from autumn through winter when growth slows. 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 wonderful wax plant in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Failure to flower without adequate light — Hoya mirabilis requires consistently bright indirect light to set flower buds; plants kept in low-light positions may grow well but rarely produce blooms.
  • Mealybugs and aphids — Soft, waxy growth points attract mealybugs and occasionally aphids; check new growth and stem joints regularly and treat with neem oil or insecticidal soap at the first sign of infestation.

Propagation

Root 10–15 cm stem-tip cuttings with two to three nodes in moist sphagnum moss or a perlite-coir mix at 22–26°C; keep humidity high around cuttings until rooted, which typically takes four to six 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

Wonderful Wax Plant is pet-safe. The Hoya genus is listed as Non-Toxic to Dogs, Non-Toxic to Cats, and Non-Toxic to Horses by the ASPCA. As with all plants, ingestion of large quantities may cause mild gastrointestinal upset. 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.

Wonderful Wax Plant care — frequently asked questions

What is the common name for Hoya mirabilis?

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

How much light does wonderful wax plant need?

Wonderful Wax Plant grows best in bright indirect light (just back from a sunny window). A bright, east- or north-facing windowsill provides ideal conditions; too little light results in slow growth and rare flowering, while harsh direct sun causes leaf scorch.

How often should I water wonderful wax plant?

Water wonderful wax plant every 7–14 days in the growing season, monthly in winter. Allow the potting medium to dry out between waterings; the epiphytic roots are very susceptible to root rot if kept constantly moist. 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 wonderful wax plant toxic to cats and dogs?

Wonderful Wax Plant is pet-safe. The Hoya genus is listed as Non-Toxic to Dogs, Non-Toxic to Cats, and Non-Toxic to Horses by the ASPCA. As with all plants, ingestion of large quantities may cause mild gastrointestinal upset.

What USDA hardiness zone does wonderful wax plant grow in?

Wonderful 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.

Wonderful Wax Plant deep-dive guides

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

Featured in these plant shortlists

Wonderful Wax Plant qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Wonderful Wax Plant is also commonly called Wonderful wax plant or Mirabilis hoya.