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Plant care

Tiger Orchid (Giant Orchid) care

Grammatophyllum speciosum

Also called Giant Orchid, Queen of Orchids.

RHS H1bUSDA 11-12Mildly toxic to petsIndoor Canes commonly 1.5-3 m long

Watering rhythm

1-3days

Abundant in growth (every 1-3 days); much drier in rest

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Light

Bright indirect light (just back from a sunny window)

Soil

Very coarse epiphytic mix in a large container

Humidity

60-80%

Temp

18-32°C

Pet safety

Mildly toxic to pets

Mature size

Canes commonly 1.5-3 m long

Care at a glance

Light

In the wild tiger orchid grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Wants very bright light, brighter than most orchids, approaching that of Vanda or Cymbidium. Give strong filtered light with some gentle direct sun; insufficient light is the main reason mature plants fail to bloom. Acclimate gradually to avoid leaf scorch. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for abundant in growth (every 1-3 days); much drier in rest for tiger orchid, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water heavily and often through active growth, especially as spikes emerge, letting roots approach dryness between soakings. After growth matures, give a distinct drier, cooler rest to ripen the canes and encourage the sporadic, spectacular flowering.

Soil and pot

Tiger Orchid grows best in very coarse epiphytic mix in a large container. Use big chunks of bark, charcoal, and coarse drainage material in a large, sturdy, free-draining pot or basket able to anchor the heavy plant. The thick roots need air and rapid drainage; fine, water-retentive mixes rot this giant epiphyte. 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

Tiger Orchid sits happiest at around 60-80% humidity and 18-32°C (64-90°F). Thrives in high humidity with strong airflow, matching its tropical lowland origins. Provide a humid, breezy environment such as a greenhouse or sheltered tropical garden; combine ample moisture in growth with ventilation to keep the large canes healthy. If you keep the room above 18 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 tiger orchid sparingly. Feed generously during active growth with a balanced orchid fertiliser at half strength every one to two weeks, as this huge plant is a heavy feeder; a higher-phosphorus feed can be used as canes mature. Flush regularly and reduce feeding during the dry rest. 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 tiger orchid in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Never flowers — By far the commonest issue: the plant must be very large and mature, given strong light and a distinct dry rest. Patience over years, bright light, and a ripening rest are essential to trigger spikes.
  • Root and base rot — From overly fine or wet media in such a large plant. Use very coarse, fast-draining mix and a sturdy container, and respect the drier rest period.
  • Leaf scorch — Bleached or burnt patches when moved too quickly into strong sun. Increase light gradually so leaves acclimate to high intensity.
  • Scale and mealybugs on canes — Pests lodge among the large pseudobulbs and leaf bases. Inspect regularly and treat with horticultural oil or systemic controls, repeating to clear hidden crawlers.

Propagation

Propagate by division of large established clumps, taking sections with several connected canes and strong roots, ideally as new growth begins. Because the plant is slow to reach flowering size, keep divisions warm, bright, and humid and expect a long establishment period. 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

Tiger Orchid is mildly toxic to pets. Grammatophyllum is not individually listed by the ASPCA; treat with caution and verify with a vet. The Orchidaceae family is broadly regarded as non-toxic and the ASPCA lists Phalaenopsis as non-toxic to cats and dogs, but this genus has no specific ASPCA assessment, so keep it out of pets' reach and consult a vet if any part is ingested. 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.

Tiger Orchid care — frequently asked questions

What is the common name for Grammatophyllum speciosum?

Grammatophyllum speciosum is most commonly called Tiger Orchid, but it is also known as Giant Orchid, Queen of Orchids. The names refer to the same species, so care instructions for Tiger Orchid apply identically to anything sold as Giant Orchid.

How much light does tiger orchid need?

Tiger Orchid grows best in bright indirect light (just back from a sunny window). Wants very bright light, brighter than most orchids, approaching that of Vanda or Cymbidium. Give strong filtered light with some gentle direct sun; insufficient light is the main reason mature plants fail to bloom. Acclimate gradually to avoid leaf scorch.

How often should I water tiger orchid?

Water tiger orchid abundant in growth (every 1-3 days); much drier in rest. Water heavily and often through active growth, especially as spikes emerge, letting roots approach dryness between soakings. After growth matures, give a distinct drier, cooler rest to ripen the canes and encourage the sporadic, spectacular flowering. 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 tiger orchid toxic to cats and dogs?

Tiger Orchid is mildly toxic to pets. Grammatophyllum is not individually listed by the ASPCA; treat with caution and verify with a vet. The Orchidaceae family is broadly regarded as non-toxic and the ASPCA lists Phalaenopsis as non-toxic to cats and dogs, but this genus has no specific ASPCA assessment, so keep it out of pets' reach and consult a vet if any part is ingested.

What USDA hardiness zone does tiger orchid grow in?

Tiger Orchid is rated for USDA zone 11-12 (warm greenhouse or tropical outdoor culture) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Tiger Orchid deep-dive guides

Every aspect of tiger orchid care, each with its own calibrated guide:

Featured in these plant shortlists

Tiger Orchid qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Tiger Orchid is also commonly called Giant Orchid or Queen of Orchids.