Majesty Palm
Ravenea rivularis · Majestic Palm
It grows huddled along riverbanks, lagoons and shallow swamps in southwest Madagascar, forming ribbons of green through otherwise semi-arid desert. It is a thirsty, light-hungry tree palm that wants more water, light and humidity than most living rooms can give.
Family
Arecaceae
Origin
Madagascar
In the wild
Riverbanks and swamps
Indoors
1.5–3 m
Growth
Moderate
With pets
Non-toxic
Where it's from
Southwest Madagascar
Green through desert
It huddles along riverbanks and lagoons and in shallow swamps, forming humid corridors inside semi-arid desert.
Endemic to Madagascar
A few isolated populations in the southwest of the island, and nowhere else on earth.
Outdoors: zones 10–11
Frost-free regions only. A patio plant summered outside and brought in elsewhere.
Vulnerable in the wild
A palm that big-box stores sell for about twenty dollars as a throwaway houseplant is, in the wild, Vulnerable, down to roughly 900 mature trees clinging to a few river valleys in Madagascar. The mass cultivation is completely decoupled from those wild stands, so the nursery trade isn't the threat, habitat loss and mining are.
Around 900 wild trees
The 2018 assessment put it at roughly 900 mature individuals in a few fragmented river valleys.
Beware the look-alike
Its real danger to pets isn't itself but the highly toxic sago palm, a look-alike sold on the same shelf. Check the tag says Ravenea rivularis.
An insurance reservoir
The huge global nursery stock acts as a vast ex-situ backup for a species scarce in nature.
How to keep it
LightVery bright, indirect
Bright indirect light indoors, full sun outdoors in its range. Too little light is a leading cause of failure.
WaterKeep evenly moist
A riverbank plant. Keep the soil reliably moist, never bone dry, but never standing in stagnant water.
HumidityHighLow indoor humidity is the usual cause of brown, crispy frond tips.
Temperature18–29°CWarm. Protect from cold drafts, air conditioning and direct heat. No frost.
SoilRich, moisture-retentiveOrganic and moisture-holding but not waterlogged, near-neutral pH.
FeedingPalm fertilizer in seasonA palm feed high in magnesium. A common palm deficiency causes yellowing.
DifficultyModerate to hardEasy to buy, hard to keep alive indoors. It is fussy about light, water and humidity.
With petsNon-toxicListed non-toxic to cats, dogs and horses. The toxic look-alike sago palm is the real risk, not this plant.
PropagationSeed onlyA solitary, single-trunked palm with no offshoots to divide and no cane propagation. The full pot look is several seedlings grown together.
RepottingEvery 2–3 yearsWhen crowded or root-bound.
What the data says
What it costs
One of the cheapest large floor palms in the big-box and grocery trade. No collector form exists.
$15–50
Large full floor specimens cost more, but there is no variegated or rare variant and so no rarity premium.
The air-purifier claim
It is lumped onto air-purifier lists, but it wasn't even in NASA's study, and that study used a sealed lab chamber.
100–1,000
plants per square metre would be needed to match a room's normal ventilation (Cummings and Waring, 2019). NASA's 1989 test used a sealed box with no airflow. Keep it for the soft tropical greenery.
IUCN · Vulnerable
In the wild
The textbook houseplant paradox: sold by the million, down to roughly 900 wild trees.
NaN+mature trees left in a few fragmented Madagascar river valleys (IUCN, 2018).
Assessed Vulnerable with a restricted range and continuing decline, threatened by slash-and-burn agriculture, logging and sapphire mining. It is listed on CITES Appendix II. The houseplant trade isn't the threat, habitat loss is, and the vast nursery stock acts as an insurance reservoir.
When it sulks
Brown, crispy leaf tipsThe classic. Low humidity, underwatering, or salt buildup from tap water. Raise humidity and use filtered water.
Yellowing frondsOften a magnesium or potassium deficiency, sometimes too little light or overwatering.
Overall decline and leaf dropUsually not enough light, humidity and steady moisture. The core reason store plants fade.
Mushy base, root rotWaterlogged, poorly drained soil.
PestsSpider mites in dry air, plus mealybugs, scale, aphids and thrips.
Varieties & company
The varieties
Straight species
Pairs with · keep apart from
Boston FernCalatheaPeace LilySnake PlantZZ PlantCacti
A new plant, every week.
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