Houseplant · Apocynaceae
Sweetheart Hoya
Hoya kerrii
Water it like a succulent, give it bright light, and the sweetheart hoya barely asks for a thing.
Bright indirect
45–80°F · 7–27°C
USDA 10–12
Overview
The sweetheart hoya gets its name from those thick, waxy leaves shaped like plump little green hearts. It's a slow-growing climber from the forests of Indo-China and Malesia, where it scrambles up tree trunks as an epiphyte. Indoors, though, it stays small and pretty laid-back, and that's exactly why you'll see it on so many windowsills.
Most people run into it as a single rooted heart in a little pot, usually around Valentine's Day. Here's the thing, though: that adorable version is just one leaf, and it tends to stay one leaf. Want a plant that actually vines? You'll need a cutting with a stem and a node, and given some time it trails out into long strands of overlapping hearts.
The whole game with this one is holding back. Those fleshy leaves store their own water, so being too generous with the watering can is honestly the fastest way to lose it. Give it light, let it dry out, and leave it a little snug in its pot, and it'll thank you with clusters of star-shaped flowers.
Care
The short version: bright indirect light, water like a succulent and only once the soil's dried out, a fast-draining mix, and a pot it can stay a bit crowded in.
Light
Pop it in bright indirect light near a south, east, or west window and it'll keep its color and bloom way better. Sure, it puts up with medium light or a bit of shade, but growth slows and flowers hardly ever show up. Just keep it out of harsh direct sun, which scorches those waxy leaves.
Water
Water it like a succulent and you're golden. The thick leaves store plenty, so let the soil dry out completely between drinks, waiting until the top third to half is dry or the leaves start to pucker a bit. Ease way off through winter, because overwatering is the main cause of root rot and the quickest way to stop it flowering.
Soil
Go with a fast-draining, loose mix that never stays soggy. A blend of one part potting soil, one part orchid bark, and one part perlite dries fast and works great. It's not picky about pH either, and it's happy anywhere from 6.0 to 8.0.
Temperature
Regular room warmth is perfect, somewhere around 45°F to 80°F (7°C to 27°C). Keep it above 45°F (7°C) and away from cold drafts, since it really can't take a chill.
Humidity
Everyday household humidity suits it just fine, so there's no number to chase. The waxy leaves hold their own moisture, which makes this plant way more forgiving about dry indoor air than most tropicals.
Feeding
Feed it once a month with a dilute liquid houseplant fertilizer while it's growing, from spring through fall. A formula with an NPK ratio around 2:1:2 or 3:1:2 does the trick. Then just skip feeding in winter while it rests.
Pruning
This slow grower barely needs any pruning. The one rule that really matters: never cut off the bare flower spurs after the blooms fade, because the plant reuses those same spurs to flower again, and lopping them off costs you next year's show.
Repotting
Only repot every few years, since hoyas bloom better when they're kept a bit potbound. Bump it up a size when roots poke out the drainage holes, water runs straight through, or the plant dries out almost the second you water it.
Troubleshooting
Just about every problem with this plant comes down to water, light, or expecting a single leaf to do more than it can. Find what matches below, then tweak things before a small slip turns into rot.
A soft, dark base and a plant flopping over at soil level
A soft, dark, mushy base is root rot, and it pretty much always traces back to too much water or a pot that holds onto it. Those thick leaves already carry their own water, so wet mix smothers the roots in no time. Stop watering, snip off anything rotted, and pop it into a fast-draining mix in a pot with drainage holes. And if the base is already gone? Just take a healthy cutting with a node and start fresh.
Fix:
- Stop watering and let the soil dry out
- Remove rotted tissue and repot into a fast-draining mix in a pot with drainage holes
- Take a healthy cutting (with a node) to start over if the base is lost
Leaves looking wrinkly and thin, like they've deflated
Wrinkly leaves can mean two totally different things, so check the soil before you jump in. If the mix is dry and the roots feel firm, the plant just got thirsty, and a good drink plumps everything right back up. But if the mix is wet and the roots feel mushy, that's overwatering wrecking the roots so they can't pull up water, and the answer there is better drainage and a chance to dry out.
Fix:
- If too dry, water thoroughly and resume a regular let-it-dry cycle
- If overwatered, correct drainage and let the soil dry before watering again
Gunky leaves, weird new shoots, or tiny bugs crawling around
Sap-sucking bugs like mealybugs, aphids, spider mites, and scale do turn up on hoyas now and then. You'll spot white cottony fluff, tiny soft insects, fine webbing with speckled leaves, or little bumps along the stems. Just wipe them off and treat with insecticidal soap or horticultural oil, then keep the plant away from the others and repeat until it's all clear.
Fix:
- Wipe off pests and treat with insecticidal soap or horticultural oil
- Isolate the plant and repeat treatment until clear
That single heart just sitting there, never vining
Ever wonder why that potted heart just sits there? It's almost always a single leaf with no node, and without a node there's no growth point to send out a stem. So it can stay plump and green for years, but it's never going to vine on its own. If a trailing plant is what you're after, start with a stem cutting that's got at least one node on it.
Fix:
- Accept that the leaf will likely remain a single leaf (it can stay green and alive for years but will not vine)
- If you want a vining plant, obtain a stem/tip cutting that includes at least one node
A perfectly happy plant that won't flower
No flowers yet? Usually it just wants more light, so scoot it over near a south, east, or west window where the light's bright but not direct. Go easy on the water too, since soggy roots keep blooms away. And keep in mind that single leaves and really young plants aren't old enough to flower anyway, so give them time. Whatever you do, don't trim off those old flower spurs, because the plant blooms from the very same ones again.
Fix:
- Move to a brighter spot with bright indirect light near a south/east/west window
- Reduce watering and let the soil dry between waterings
- Be patient and do not cut off the flower spurs
Toxicity
Good news if you've got animals around: the sweetheart hoya is non-toxic and pet-safe. Both the ASPCA and NC State Extension list it as safe for cats, dogs, and horses, and the rest of the household is fine too. A pet that overdoes it on any plant might get a quick stomach ache, but there's really nothing toxic to worry about.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Got a cat? No stress here, because the ASPCA and NC State Extension both call this hoya non-toxic to cats. If a cat really goes to town on any houseplant, it might drool a bit or get a quick upset stomach, but that sorts itself out.
Dogs None
Dogs are fine too, and it's the same non-toxic listing from the ASPCA and NC State Extension. A determined chewer might end up with a little short-lived tummy trouble, and honestly that's about it.
Horses None
Horses don't have to steer clear either, since both the ASPCA and NC State Extension mark this one non-toxic to them.
Rabbits Safe
A rabbit's got nothing to worry about here, since there are no toxins in play. Still, with any new greenery, keep the portions small so a big mouthful doesn't upset a delicate gut.
Livestock Safe
This one lives indoors, so grazing animals hardly ever run into it, and it wouldn't hurt them even if they did.
Birds Safe
A pet bird can hop around and peck at the waxy leaves without any trouble, because there's nothing in there known to bother them.
People Safe
There's nothing poisonous in this hoya for people, so if a kid sneaks a taste, don't panic. That said, it's not grown to eat, so there's really no reason to munch on it.
Considered pet-safe; no special handling for toxicity is required, though pets eating any plant may have mild, transient GI upset
Varieties
The plain green form is what you'll usually see, but there's one named variety that pops up in plant shops and it's worth knowing about.
'Variegata'
You'll know this one by the green middle on each heart-shaped leaf wrapped in a soft creamy-white edge, which makes it look a good bit brighter than the plain green kind.
How to propagate
There's basically one dependable way to make more of this plant, and the whole trick is just making sure your cutting has a node.
Stem cuttingsEasy
Spring to summer · Roots in a few weeks
Take a stem or tip cutting with at least one node in spring or summer, while the plant's actively growing. Stick it in a fast-draining mix and it'll root in a few weeks. Just don't bother with a bare single leaf, because it'll root and live but has no node, so it never turns into a vine.
Myths
Give that lone potted heart enough time and it'll grow up into a proper vine.
A bare leaf will root just fine, but with no node it's got no growth point, so it stays one leaf and that's that. Penn State Extension doesn't mince words about the cute potted heart: it's simply a single leaf of H. kerrii that stays just as it is and never becomes a vine. Want something that trails? You'll need a cutting with a node and a bit of stem on it.