Moth Orchid
Phalaenopsis · the Phal
In the wild it is an epiphyte, growing on the trunks and branches of trees in warm, humid forests across tropical Asia. It is not parasitic and it never grows in soil. The flat, rounded flowers were named for a moth, from the Greek phalaina.
Family
Orchidaceae
Origin
Tropical Asia
In the wild
On tree trunks
Indoors
0.2–0.9 m
Growth
Slow
With pets
Non-toxic
Where it's from
India and southern China through Southeast Asia to Australia
Canopy epiphyte
On tree trunks and branches in warm, humid lowland and montane forest, in the shaded, dappled light under the canopy.
Outdoors: zones 10–12
A houseplant almost everywhere. Outdoors only in frost-free tropics, mounted in bark under tree shade.
Not invasive
An epiphyte with no naturalisation or weed problem reported.
A CITES plant at the supermarket
Every wild Phalaenopsis is on CITES Appendix II, yet the plant on your windowsill is legal and dirt-cheap because lab tissue-culture clones are exempt. The same plant is both the world's best-selling potted flower and an internationally regulated species.
It runs CAM, like the snake plant
It fixes carbon dioxide at night, an adaptation to the water-stressed life of an epiphyte. A real night-breather quirk.
Blue orchids are dyed
A blue Phalaenopsis is almost always a white-flowered plant injected with dye. The next bloom comes back white.
Months of flower
The arching sprays of moth-like flowers last four months or more, the whole reason it leads the potted-plant market.
How to keep it
LightBright, indirect
No direct sun. Categorised as a low-light orchid. An east-facing windowsill is ideal.
WaterWeekly, in the morning
Water thoroughly with tepid water, letting the bark dry slightly between. Silvery roots mean water, green roots mean wait. Standing water is the main killer.
Humidity50 to 60% or moreUse a pebble humidity tray or humidifier. Misting the leaves is not needed and can invite rot.
Temperature20–25°C dayNights above 16°C. A few cool autumn nights near 13°C trigger a flower spike. Avoid anything below about 13°C.
SoilCoarse orchid barkNever standard potting mix, which causes rot. It is an epiphyte and needs air to the roots.
FeedingWeakly, weeklyA dilute balanced orchid fertiliser in growth. Ease off when dormant.
DifficultyEasy to moderateForgiving except about soggy roots and cold.
With petsNon-toxicListed safe for cats, dogs and horses by the ASPCA. A genuinely pet-safe flowering plant.
PropagationKeikiA baby plantlet that sprouts on the flower spike, potted up once it has its own roots. Commercial stock is tissue-cultured.
RepottingEvery 1 to 2 yearsWhen the bark breaks down or roots overflow the pot. Best done after flowering.
What the data says
What it costs
A cheap commodity flower as a hybrid, with a small collector layer for novelties and species. Orchid premiums are modest next to the variegated-Monstera bubble.
$15–40
Supermarket hybrid
A standard blooming plant, mass-produced by tissue culture.
$40–150+
Novelty or species
Peloric, harlequin, fragrant and variegated-leaf forms, plus true botanical species.
$15–40Supermarket hybrid
$40–150+Novelty or species
Hover the points. Almost every plant sold is a complex hybrid grex, not a named species.
It does not clean your air
Phalaenopsis was not even in the 1989 NASA study, so the lab claim does not apply to it. People extend the air-purifier idea anyway.
100–1,000
plants you would need to match a single window's air exchange (Cummings and Waring, 2019). It runs CAM and releases a little oxygen at night, but at one-plant scale the effect is negligible.
IUCN · CITES Appendix II
In the wild
Billions of nursery clones sit in homes, yet every wild species is regulated and some are squeezed by collection and deforestation.
All wild orchids are CITES-listed and Phalaenopsis species sit in Appendix II. Habitat loss and over-collection of wild plants are leading threats. The supermarket flower and the protected wild plant are the same lineage. Thriving in our homes, vanishing in the wild.
When it sulks
Limp, wrinkled leaves with mushy rootsOverwatering and root rot, the most common problem. Repot into fresh bark and cut dead roots.
Shriveled leaves with dry silvery rootsUnderwatering.
Buds drop before openingBud blast from temperature swings, dry air, drafts, or ripening fruit nearby.
No rebloomingIt needs a few cool autumn nights to trigger a spike, and enough light.
Bleached patchesSunburn from direct sun.
Varieties & company
The varieties
Standard hybridPeloricHarlequinVariegated leafBotanical species
Pairs with · keep apart from
FernsBromeliadsAnthuriumSnake PlantZZ PlantCacti
A new plant, every week.
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