A small string of hearts hung on a shelf in the corner of the living room — mostly because that is the spot that looks good with something trailing in it — will grow. The vines get longer, and it is easy to feel pretty smug about it until a closer look shows that the top half of every single strand is bare wire with nothing on it, and all the leaves are bunched at the bottom ends. Length is not the same thing as health: a plant in poor light can keep getting longer while that is the only thing it manages to do.
Long bare vines on this plant are almost always a light problem, an age problem, or both at once, and the fix for the second one is not the fix most people reach for.
Quick triage: new growth coming in with leaves spaced an inch or more apart, colours washed out, vines all leaning toward one side of the room? Not enough light. Bare stretches only on the older upper sections while the trailing ends still look full? That is normal shedding on old growth, and it will not refill by itself. Leaves went thin and wrinkled before they dropped, and the soil has been bone dry for long stretches? Watering swings. Leaves dropped fairly suddenly and there is white cottony fuzz down in the tangle where the stems meet the soil? Mealybugs.
Not enough light, which is the usual answer
String of hearts gets sold next to pothos and philodendrons as a nice easy trailing plant, and that shelving decision has probably cost more of these plants their leaves than anything else. It is a semi-succulent from rocky slopes in southern Africa. It wants a lot more light than a trailing vine usually implies, and in a dim corner it does what any stretching plant does: it puts its energy into extending the stem toward the nearest light source and skips most of the leaves along the way.
The tell is spacing. On a well-lit plant the leaves sit close together in tidy opposite pairs, maybe half an inch apart, and they colour up with silver marbling and purple undersides. On a light-starved one the gap between pairs stretches out to an inch or two and the leaves that do form stay small and flat green. This is the same stretching response covered in the general guide to leggy houseplants, it just shows up more dramatically here because the stems are so thin that bare sections look like bare thread.
A spot right at an east or south window is not too much; a couple of hours of direct morning sun is usually fine for this plant. If your brightest window is still dim, a basic grow light on a timer will do it. What will not work is moving it two feet closer to the same dim corner and hoping.
Old vines shed their leaves and never fill back in
This is the part nobody tells you when you buy one. As a strand gets long, the oldest leaves near the crown naturally yellow and drop off, and the nodes they came from do not produce replacements. A node fires once. So even a perfectly healthy plant in great light will slowly go bare at the top and full at the bottom, and the longer the vines get the more obvious it becomes.
The instinct is to cut the bare sections off, which does tidy things up but leaves you with a smaller plant and the same crown that will just go bare again. The better move is to coil the vines back over the surface of the soil and pin them down with a bent paperclip or a hairpin so the nodes touch damp soil. Those nodes root in a few weeks and start new growth from the top of the pot, which is how you get a plant that looks full at the crown instead of one long bare curtain. It costs you nothing and it is the single best habit to pick up with this plant.
Watering swings the tubers cannot ride out
Under the soil this plant keeps a lumpy grey tuber, and that tuber is a water tank. It buys the plant a lot of tolerance for being forgotten, which is why string of hearts has a reputation for being tough. But the tank is not bottomless. Go too long between waterings, repeatedly, and the leaves thin out, wrinkle at the edges and drop, working from the oldest growth outward. It looks similar to the shrivelling described in the string of pearls troubleshooting guide, which makes sense given both are trailing succulents relying on stored water.
Overwatering causes leaf loss too, just faster and messier: the leaves go soft and translucent rather than wrinkled, and the tuber can rot out from under the whole plant. If you are not sure which way you have erred, the texture test in the guide to telling overwatered from underwatered plants sorts it out, and if the stems near the soil are mushy, read up on root rot before you water again. The pattern that actually works here is a proper soak until water runs out the drainage hole, then nothing at all until the soil is dry all the way through.
Mealybugs hiding in the tangle
Mealybugs love this plant, and the mat of overlapping vines at the top of the pot is the perfect place for them to sit unnoticed for a month. They show up as small white cottony specks tucked where leaf stalks meet the vine, or down at soil level around the tuber. The leaves above them yellow and drop, which reads as a watering problem if you never lift the vines and look underneath.
Worth doing a deliberate inspection every few weeks: lift the strands, look at the crown, check the undersides. Isolated spots come off with a cotton swab dipped in rubbing alcohol. A wider infestation needs the whole plant treated with insecticidal soap, repeated weekly for a month, because the eggs hatch in waves.
A few things people ask
Will the bare part of the vine ever grow leaves again? No, not from the nodes that already dropped their leaves. Growth on this plant comes from the growing tips and from new shoots at the crown. That is why coiling vines back onto the soil beats waiting.
Should I just cut the bare vines off? You can, and the cuttings root easily in soil, so nothing is wasted. But if the plant is bare because the light is poor, trimming it gives you a shorter plant with the same problem. Fix the light first, then tidy up.
Why are some of my leaves purple instead of silver and green? That is a good sign, not a problem. Strong light brings out anthocyanin pigments in the undersides and stems. A plant that is all flat green is usually one that is not getting enough.
Is it safe around pets? Ceropegia woodii is not on the ASPCA toxic list and is generally treated as non-toxic to cats and dogs. The dangling vines are still an invitation to a bored cat, so a high shelf saves everyone trouble.
Once the bare vines are sorted out, the thing that keeps them from coming back is the everyday routine: how much light it sits in, how long you leave the soil dry, and when to stop feeding it. That is all laid out in the string of hearts care guide, along with what to do with the little bead-like tubers that appear along the stems. Next reads: String of Pearls Care Guide: Light, Water, and Propagation, Why Are My Pothos Leaves Turning Yellow? and Why Is My Tradescantia Losing Its Color?.