Sweetheart Hoya
Hoya kerrii · the Sweetheart Plant
It climbs the warm forests of Southeast Asia as a slow waxy vine. But the houseplant trade sells it as a single fat, heart-shaped leaf in a tiny pot near Valentine's Day, and most of those leaves will never grow into the vine on the label.
Family
Apocynaceae
Origin
Southeast Asia
In the wild
Climbs to 4 m
Indoors
0.3–0.9 m
Growth
Slow
With pets
Safe
Where it's from
Southeast Asia and Indochina
Climbs to 4 m
Woody twining stems scramble up trees, sending out long bare feelers before they leaf out.
Across Indochina
South China, Vietnam, Laos, Cambodia and Thailand, reaching the island of Java.
Outdoors: zones 10–12
Frost-tender tropical. A houseplant everywhere colder, summering outdoors in shade.
A leaf, not a plant
New stems and leaves grow only from a node, the joint where a leaf meets the stem. A single leaf sold with no piece of stem has no node, so it will root and stay green and chubby for years but can never sprout a vine. You bought a leaf, not a plant.
Green for years
A lone leaf roots and survives a long time, which is why the gimmick works.
It needs a node
Only a cutting that includes a piece of stem can grow new leaves and vine.
Flowers only on a vine
A mature plant can bloom after a few years. A single leaf never will.
How to keep it
LightBright, indirect
Shade it from hot direct sun, which scorches. More light raises the chance of flowering.
WaterLet it dry well
Semi-succulent leaves store water. Soggy mix is the main killer. Keep barely moist in winter.
HumidityAverage is fineTolerates dry air better than thinner-leaved tropicals. No fuss needed.
Temperature16–24°CTender. Keep above about 10°C, cooler and drier in winter for a rest.
SoilFast-draining, airy mixLoam-based or peat-free compost with extra grit, perlite or bark.
FeedingMonthly in growthA balanced liquid feed in the growing season. Stop in winter.
DifficultyEasyA full plant is forgiving and low-fuss. Notoriously slow.
With petsSafeNon-toxic to dogs, cats and horses. The cut sap is a milky latex that can mildly irritate.
PropagationCutting at a nodeA stem cutting with at least one node roots in water or moist mix. A bare leaf never will.
RepottingRarelyIt resents repotting and flowers better slightly pot-bound. It can stay put for years.
What the data says
What it costs
A cheap seasonal gift plant. The single rooted leaf is a mass-produced Valentine's product.
$8–25
Variegated forms and well-grown vines run higher, roughly $25 to $80. No four-figure bubble.
IUCN · Not assessed
In the wild
Not on the Red List, and the trade is overwhelmingly nursery-grown, not wild-dug.
Hoya kerrii has no published Red List assessment, and the genus is not CITES-listed. The commercial supply is propagated in nurseries for the gift trade, so pressure on wild populations is low. The real tension here is commercial, not conservation: millions of single leaves sold as plants that were never going to grow.
When it sulks
Single leaf never growsIt has no node, so it biologically cannot vine. Only a cutting with stem will.
Mushy, yellowing leavesRoot rot from overwatering or heavy wet mix, the number one killer.
Shrivelled, wrinkled leavesUnderwatering, or rotted roots that can no longer take up water.
No flowersToo young, too little light, or recently moved. Blooms only on mature vines.
PestsMealybugs love the leaf joints. Also scale, aphids and spider mites.
Varieties & company
The varieties
Plain greenVariegataReverse VariegataSplash
Pairs with · keep apart from
Hoya carnosaSucculentsHindu RopeCalatheaFernsFittonia
A new plant, every week.
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