Houseplant · Apocynaceae
String of Hearts
Ceropegia woodii
Hand it bright light and a proper dry spell, and the hearts come tumbling down for years.
Bright indirect
59–86°F · 15–30°C
USDA 10–12
3–12 ft · 0.9–3.7 m
Overview
String of hearts comes from southern Africa, where it scrambles over rocks as a tuberous vine and never looks back. Slim stems string together pairs of small heart-shaped leaves, each marbled silver across a deeper green, and that shape hands the plant its nicknames: rosary vine, chain of hearts, sweetheart vine. Indoors it pours from a hanging pot or a high shelf, the strands stretching several feet as the months roll on.
It earns its easy name fair and square. The plant banks water in its leaves and along its stems, so it laughs off a skipped watering far more readily than a soggy pot. Park it in a bright spot with a gritty, quick-draining mix and it practically runs itself, piling on length through spring and summer.
Two things drive the whole show: bright indirect light and a good dry-out between waterings. Shortchange the light and the vines shoot out pale and bare; overdo the water and the roots collapse. Nail that pair and you land a long-lived, forgiving plant that multiplies into more with almost no effort.
Care
The short version: bright indirect light, a free-draining cactus or succulent mix, and water only once the soil has dried out completely, backing off further through winter dormancy.
Light
Pour on the bright indirect light, the brighter the better right up to harsh midday sun. A west- or south-facing window is the sweet spot, since strong light keeps the vines tight and the hearts boldly marbled. Stuck in a dim corner, the growth goes pale and stretchy.
Water
This is the make-or-break habit. Let the soil dry out completely, then water it thoroughly, because the plant carries its own reserves and rots the moment the pot stays wet. Come winter dormancy it barely sips, so ease right off then.
Soil
Set it in a free-draining cactus or succulent mix, cut with coarse sand or perlite so water shoots straight through. It shrugs at a wide pH range from 6.0 to 8.0, so drainage counts for far more than chemistry.
Temperature
Regular room warmth keeps it cruising, anywhere from 59°F to 86°F (15°C to 30°C). Hold it above 60°F (16°C) through winter and clear of cold drafts, since frost is the one thing it cannot take.
Humidity
Everyday household air suits it fine, and low humidity is no obstacle for a semi-succulent like this. Skip the misting and forget chasing a humidity number.
Feeding
Feed it through the spring and summer growing season with a half-strength balanced houseplant fertilizer, once a month at most. When winter rolls in and the plant rests, cut the feeding out entirely.
Pruning
Cut back any vine that runs too long or thin and the plant bounces into fuller, bushier growth. Save every trimming, because each strand roots with ease into a brand new plant.
Repotting
This one thrives crowded, so hold off repotting until you really must. The giveaways are roots packing the pot, soil that dries almost the second you water, and growth that has stalled out.
Size & spacing
35–144 in (90–365 cm) tall
Troubleshooting
Nearly every string of hearts hiccup traces to two culprits: not enough light or too much water. Get good at reading the vines and the soil and you will head both off fast, before they gain any ground. Spot your symptom below and jump on it early.
Yellowing leaves with soft, mushy stems at the base
Yellow leaves teamed with soft, mushy stems spell root rot from overwatering, the one slip that can take this plant down. A mix that stays soggy turns the lower stems squishy and the roots brown and soft. Drop the watering can, let everything dry out fully, and repot into a free-draining cactus or succulent mix, snipping off the rotted tissue as you go. If the rot has spread, grab a few healthy cuttings or tubers as backup and start fresh.
Fix:
- Stop watering and allow the mix to dry out completely
- Repot into a free-draining cactus/succulent mix and remove rotted tissue
- Take healthy stem cuttings or tubers as backup if rot is advanced
Sticky film, warped growth, or bugs riding the vines
Sticky film or twisted new growth usually means aphids, mealybugs, or scale have moved in to feed. Hunt for white cottony tufts, tiny raised bumps, or clusters of soft-bodied insects along the stems and leaf undersides. Swab them off with a cotton bud dipped in isopropyl alcohol, hit them with insecticidal soap, and keep the plant away from the rest of the collection until it clears.
Fix:
- Wipe off pests with a cloth or cotton swab dipped in isopropyl alcohol
- Treat with insecticidal soap as needed
- Isolate the plant to prevent spread
Long, thin strands with big gaps between the hearts
Stretched, gappy vines are the plant shouting for more light, plain and simple. The hearts turn out pale instead of crisply marbled, and the stems race on with little to fill them. Shift it to a brighter window with bright indirect light, then trim the leggy runs to fire off denser, fuller growth.
Fix:
- Move to a brighter spot with bright indirect light, such as a west- or south-facing window
- Trim leggy growth to encourage denser branching
Toxicity
Great news for pet owners and parents: string of hearts is broadly counted as non-toxic and safe around cats, dogs, and the whole household. The milky sap can leave sensitive skin a touch itchy, so rinse your hands after taking cuttings, but a curious nibble is nothing to sweat.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
String of hearts counts as non-toxic, so a cat that grabs a heart or two will be perfectly fine. Any houseplant wolfed down in bulk can trigger a bit of drooling or a passing stomach upset, but nothing serious is in play.
Dogs None
Dogs can share their space with these dangling strands and stay in the clear. The plant packs no known toxin for them, though a hearty chew on the stems might stir up mild, short-lived stomach upset, like any non-food plant.
Horses None
Horses have zero to worry about here. It is a compact indoor vine they will almost never run into, and it holds nothing that could harm them.
Rabbits None
Rabbits are safe right beside string of hearts. The foliage carries no poison, so a stray bite does no damage, though keeping the strands out of reach protects the plant.
Livestock None
Grazing animals face no threat from this plant, which lives indoors in a pot far from any pasture. Nothing inside it is toxic to them.
Birds None
Pet birds can perch and peck around this vine with no trouble, since it holds no toxin known to harm them. An occasional nibbled leaf is nothing to worry about.
People None
String of hearts poses no real risk to people. The milky sap can leave sensitive skin a touch itchy, so wash your hands after taking cuttings, and it is simply not food.
As with any houseplant, discourage pets and children from chewing the foliage, and the milky sap of Apocynaceae plants may cause mild irritation in some individuals.
Varieties
Most growers run the plain species, but one named form pops up often enough to keep on your radar.
Ceropegia woodii 'Variegata'
A variegated form splashed with pink, cream, and green that puts on growth at a slower clip than the plain species.
How to propagate
Hardly any houseplant gives back like this one. Every long vine is a stash of new plants, whether you snip a cutting, root a single bead, or layer a stem while it still clings to the parent.
Stem cuttingsEasy
Active growing season (spring to summer) · A few weeks to root, especially with bottom heat
Stem cuttings are the easiest way in, hands down. Take them during the active growing season across spring and summer, tuck them into a free-draining mix, and they strike roots within a few weeks. A shot of bottom heat underneath really gets them going.
Offsets & pupsEasy
Active growing season · A few weeks once in contact with soil
Scan the vines and you will spot small aerial tubers, the bead-like tubercles that handed the rosary vine its name. Press one onto the soil during the growing season and it roots all on its own, throwing up a new plant within a few weeks.
LayeringEasy
Active growing season · A few weeks
Layering lets you root a plant before you cut anything. While a trailing stem still holds onto the parent, pin it so the tubercles press into the soil, give it a few weeks of active growth to root, then snip the new plant loose.
Myths
String of hearts has to be watered constantly to stay lush, just like a regular leafy houseplant.
Not so: this is a drought-tolerant semi-succulent, not some thirsty leafy plant, and it genuinely wants to dry out completely between drinks. Overwatering is what finishes it off, rotting the roots beyond rescue. Once winter dormancy kicks in and growth halts, back off the water even more.