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Plant care

Green-flowered Wax Plant (Wax plant) care

Hoya chlorantha

Also called Green-flowered wax plant, Wax plant.

RHS H1bUSDA 11–12Pet-safeIndoor Vines typically reach 1–2 m in a container with support or allowed to trail.

Watering rhythm

7-12days

Every 7–12 days in the growing season; every 2–3 weeks in winter

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Light

Bright indirect light (just back from a sunny window)

Soil

Well-draining peat-free mix

Humidity

55–75%

Temp

16–29 °C

Pet safety

Pet-safe

Mature size

Vines typically reach 1–2 m in a container with support or allowed to trail.

Care at a glance

Light

Green-flowered Wax Plant is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Best positioned in a bright east- or north-facing window; the thin leaves are more susceptible to sun scorch than thicker-leaved Hoyas, so avoid prolonged direct afternoon sun. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water green-flowered wax plant every 7–12 days in the growing season; every 2–3 weeks in winter. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water abundantly in the growing season, but allow the top 3–5 cm of mix to dry between waterings; this species produces abundant nectar which can drip, so a drip tray is helpful.

Soil and pot

Green-flowered Wax Plant grows best in well-draining peat-free mix. Combine peat-free potting mix with perlite and coarse sand in roughly equal thirds to prevent waterlogging while retaining just enough moisture for the active root system. 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

Green-flowered Wax Plant sits happiest at around 55–75% humidity and 16–29 °C (61–85 °F). Being native to the humid Pacific Islands, this species appreciates humidity above 55%; a pebble tray with water beneath the pot provides a simple boost. If you keep the room above 16–29 °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 green-flowered wax plant sparingly. Apply a diluted balanced liquid fertiliser monthly from March to September; a high-potassium feed in late spring can encourage flower production. 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 green-flowered wax plant in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Nectar drip mess — Flowers produce copious nectar that drips and can become sticky on furniture; place a drip tray or position away from soft furnishings when in bloom.
  • Spider mites in dry conditions — Fine webbing and stippled, pale leaf surfaces indicate spider mites, most common when humidity falls below 40%; increase humidity and treat with insecticidal soap or neem oil spray.

Propagation

Stem cuttings of 10–15 cm with one or two nodes root readily in sphagnum moss or water at 22–26 °C; high humidity during rooting shortens the time to establishment. 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

Green-flowered Wax Plant is pet-safe. The ASPCA classifies the Hoya genus as non-toxic to dogs, cats, and horses; no toxic principles are identified. The abundant nectar drips may attract pets but does not cause harm beyond possible 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.

Green-flowered Wax Plant care — frequently asked questions

What is the common name for Hoya chlorantha?

Hoya chlorantha is most commonly called Green-flowered Wax Plant, but it is also known as Green-flowered wax plant, Wax plant. The names refer to the same species, so care instructions for Green-flowered Wax Plant apply identically to anything sold as Wax plant.

How much light does green-flowered wax plant need?

Green-flowered Wax Plant grows best in bright indirect light (just back from a sunny window). Best positioned in a bright east- or north-facing window; the thin leaves are more susceptible to sun scorch than thicker-leaved Hoyas, so avoid prolonged direct afternoon sun.

How often should I water green-flowered wax plant?

Water green-flowered wax plant every 7–12 days in the growing season; every 2–3 weeks in winter. Water abundantly in the growing season, but allow the top 3–5 cm of mix to dry between waterings; this species produces abundant nectar which can drip, so a drip tray is helpful. 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 green-flowered wax plant toxic to cats and dogs?

Green-flowered Wax Plant is pet-safe. The ASPCA classifies the Hoya genus as non-toxic to dogs, cats, and horses; no toxic principles are identified. The abundant nectar drips may attract pets but does not cause harm beyond possible mild gastrointestinal upset.

What USDA hardiness zone does green-flowered wax plant grow in?

Green-flowered Wax Plant is rated for USDA zone 11–12 (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.

Green-flowered Wax Plant deep-dive guides

Every aspect of green-flowered wax plant care, each with its own calibrated guide:

Featured in these plant shortlists

Green-flowered Wax Plant qualifies for 11 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Green-flowered Wax Plant is also commonly called Green-flowered wax plant or Wax plant.