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Plant care

Christmas Orchid (Colombian National Orchid) care

Cattleya trianaei

Also called Colombian National Orchid, Flor de Mayo, Christmas Cattleya.

RHS H1bUSDA 11-12Pet-safeIndoor 30-50 cm tall

Watering rhythm

7-10days

When the potting medium is nearly dry, approximately every 7-10 days in active growth; reduce to every 14-21 days in autumn

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Light

Bright indirect light (just back from a sunny window)

Soil

Coarse bark with perlite, or mounted on cork bark

Humidity

50-70%

Temp

12-28°C

Pet safety

Pet-safe

Mature size

30-50 cm tall

Care at a glance

Light

Bright but filtered. Christmas Orchid burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Needs the brightest indirect light available — south- or west-facing windows in the northern hemisphere are ideal. Leaves should be a medium grassy-green; dark green indicates insufficient light and will suppress flowering. 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 christmas orchid: when the potting medium is nearly dry, approximately every 7-10 days in active growth; reduce to every 14-21 days in autumn. 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 bark mix to approach dryness before thoroughly soaking. Reduce watering in late summer to early autumn to encourage flower sheaths to develop before resuming normal watering once sheaths are established.

Soil and pot

Christmas Orchid grows best in coarse bark with perlite, or mounted on cork bark. A very open, fast-draining mix replicates the epiphytic root environment. Repot into fresh bark every two to three years or when the medium begins to break down and become dense. 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

Christmas Orchid sits happiest at around 50-70% humidity and 12-28°C (54-82°F). Moderate to high humidity is preferred. Use a humidifier, pebble tray, or group plants together to maintain 50-60% in centrally heated winter rooms. Good airflow is equally important to prevent fungal issues. If you keep the room above 12 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 christmas orchid sparingly. Feed with a balanced orchid fertiliser at half-strength fortnightly during spring and summer. Switch to a high-potassium (bloom-booster) formula in late summer to harden pseudobulbs before the autumn 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 christmas orchid in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Failure to flower — Insufficient light is the primary cause; secondary causes include skipping the autumn dry-down rest.
  • Root rot — Decomposed bark retaining moisture suffocates roots; repot into fresh coarse mix every 2-3 years.
  • Scale insects — Armoured scale on pseudobulbs and leaf undersides is common, especially in still indoor air.
  • Bud blast — Ethylene from ripening fruit, gas stoves, or draughts causes developing buds to brown and drop.
  • Viral mosaic on leaves — Cattleyas are susceptible to Cymbidium mosaic virus (CymMV); introduced on contaminated cutting tools — sterilise tools between plants.

Companion plants

Christmas Orchid pairs well with Cattleya warscewiczii, Cattleya percivaliana, Oncidium flexuosum, and Rhynchostylis. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Divide clumps at repotting so each section retains at least three to four pseudobulbs with healthy roots. Avoid dividing into fewer than three pseudobulbs as small divisions take considerably longer to rebloom. 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

Christmas Orchid is pet-safe. The ASPCA classifies Cattleya orchids as non-toxic to cats, dogs, and horses. Cattleya trianaei is not associated with any toxic compounds harmful to pets. 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.

Christmas Orchid care — frequently asked questions

What is the common name for Cattleya trianaei?

Cattleya trianaei is most commonly called Christmas Orchid, but it is also known as Colombian National Orchid, Flor de Mayo, Christmas Cattleya. The names refer to the same species, so care instructions for Christmas Orchid apply identically to anything sold as Colombian National Orchid.

How much light does christmas orchid need?

Christmas Orchid grows best in bright indirect light (just back from a sunny window). Needs the brightest indirect light available — south- or west-facing windows in the northern hemisphere are ideal. Leaves should be a medium grassy-green; dark green indicates insufficient light and will suppress flowering.

How often should I water christmas orchid?

Water christmas orchid when the potting medium is nearly dry, approximately every 7-10 days in active growth; reduce to every 14-21 days in autumn. Allow the bark mix to approach dryness before thoroughly soaking. Reduce watering in late summer to early autumn to encourage flower sheaths to develop before resuming normal watering once sheaths are established. 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 christmas orchid toxic to cats and dogs?

Christmas Orchid is pet-safe. The ASPCA classifies Cattleya orchids as non-toxic to cats, dogs, and horses. Cattleya trianaei is not associated with any toxic compounds harmful to pets.

What USDA hardiness zone does christmas orchid grow in?

Christmas Orchid is rated for USDA zone 11-12 (indoor only in most temperate climates; brief cool spells to 10°C are tolerated if dry) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Christmas Orchid deep-dive guides

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

Featured in these plant shortlists

Christmas Orchid qualifies for 7 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

  • Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
  • Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
  • Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
  • Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
  • Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
  • Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
  • Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
  • Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Christmas Orchid is also known as Colombian National Orchid, Flor de Mayo, and Christmas Cattleya.