How to Care for a String of Dolphins (Senecio peregrinus)

String of dolphins (Senecio peregrinus, also classified as Curio peregrinus) is the houseplant that makes people stop and look twice. Each curved, fleshy leaf is shaped uncannily like a tiny leaping dolphin, complete with a dorsal fin and flippers, strung in rows along trailing stems. It is a hybrid, a cross between string of pearls (Senecio rowleyanus) and the candle plant (Senecio articulatus), and it inherited the trailing habit of one parent and the chunky leaf substance of the other. That makes it a true succulent, and it should be cared for like one.

String of dolphins is genuinely rarer and a little more demanding than its cousins, mostly because it needs more light than people expect and is unforgiving about overwatering. It is not difficult once you internalize the two rules that govern all succulents: give it as much bright light as you can, and let it dry out hard between drinks. Get those right and you will be rewarded with cascading stems of leaping dolphins, and possibly small, fuzzy, cinnamon-scented flowers in the warmer months.

This guide covers the light, water, soil, temperature, feeding, and propagation that keep a string of dolphins firm, plump, and clearly dolphin-shaped, plus how to fix the leaf-shape and stretching problems that signal something is off.

Light: This Succulent Wants Sun

More than anything else, string of dolphins needs bright light, and this is where most plants fail. It wants the brightest spot in your home: very bright indirect light at minimum, and ideally several hours of gentle direct sun each day. An east- or west-facing window, or a position close to a bright south-facing window, suits it well. With enough light the leaves stay plump, tightly spaced, and distinctly dolphin-shaped, the very feature you bought the plant for.

Deprive it of light and the plant degrades fast. Stems stretch and the gaps between leaves widen, a process called etiolation, and worst of all the leaves lose their dolphin shape, flattening into plain, narrow tabs as the plant reaches desperately toward the light. If your dolphins are turning into anonymous green slivers, the cause is almost always insufficient light. Move it brighter, or supplement with a grow light running ten to twelve hours a day.

One caution: while it loves sun, harsh, intense afternoon summer sun magnified through glass can still scorch the leaves, leaving brown or bleached patches. If you are moving a plant from a dim shop into a sunny window, acclimate it over a week or two by gradually increasing exposure rather than dropping it into full blazing sun overnight. Soft morning sun is almost always safe; the hottest midday rays are the ones to watch.

Watering: Treat It Like the Succulent It Is

Water with the soak-and-dry method that all succulents prefer. When the soil is completely dry top to bottom, water thoroughly until it pours out the drainage holes, then do not water again until the mix has dried out entirely. Those plump leaves are water tanks; the plant can wait far longer than you think. In a bright spot during spring and summer this often works out to roughly every one to two weeks, but always check the soil rather than following a fixed schedule.

In fall and winter the plant slows down and uses very little water, so cut back to perhaps every three to four weeks, watering only enough to keep the leaves from shriveling badly. The single biggest mistake is watering too often. The fine roots and stems rot in cold, wet soil, and once rot reaches the stems the plant collapses quickly. When you are unsure whether to water, wait; a thirsty string of dolphins recovers in a day, an overwatered one often does not.

Read the leaves to dial it in. Firm, plump, rounded leaves mean the plant is well watered, so hold off. Softening, flattening, or wrinkling leaves mean it is genuinely thirsty and ready for a deep soak. Yellow, mushy, or translucent leaves and a stem that turns soft and brown at the soil line mean overwatering and rot; pull back hard on water immediately, and if rot is spreading, salvage healthy stem tips as cuttings. The same dry-loving discipline applies to its sun-loving relative in our guide to string of hearts care.

Soil and Potting

Use a gritty, fast-draining succulent or cactus mix in a pot with drainage holes, and never let the pot stand in a full saucer. If you want to improve a bagged cactus mix, blend in extra perlite, pumice, or coarse sand so water races through and the roots breathe between waterings. Dense, water-holding potting soil keeps the roots wet and is the fastest route to rot for this plant.

Terracotta pots are ideal because the porous clay pulls moisture out of the soil and helps it dry faster, which is exactly what a succulent wants. String of dolphins has a modest, shallow root system and is happy somewhat snug in its pot, so do not over-pot it; an oversized container holds too much wet soil. Repot only every couple of years or when the plant is clearly outgrowing its home, moving up just one pot size. Spring is the best time to repot, and handle the brittle stems gently so the leaves do not snap off. To understand why a light, gritty container medium outperforms heavy ground soil, see our comparison of potting mix vs. garden soil.

Temperature, Humidity, and Feeding

String of dolphins is comfortable in typical household temperatures of about 60-80°F (15-27°C). It is not cold-hardy and should be kept above roughly 50°F (10°C), so protect it from frost and from cold winter glass. A slight dip in nighttime temperature in fall can actually help trigger its small, fuzzy white flowers, which smell faintly of cinnamon, but never let it get near freezing.

Humidity is a non-issue. As a succulent it prefers average to dry household air and does not want misting, which only encourages rot on the fleshy leaves. Ordinary room humidity is perfect, so skip the humidifier and the spray bottle.

Feed sparingly. During the spring and summer growing season, apply a diluted succulent or cactus fertilizer, or a balanced houseplant feed at half strength, roughly once a month. Stop feeding through fall and winter while the plant rests. Like most succulents, it is adapted to lean conditions, and too much fertilizer produces soft, weak, etiolated growth rather than tight, well-formed dolphins.

How to Propagate String of Dolphins

Propagating string of dolphins is straightforward and a smart insurance policy for a plant this prized: take cuttings while the parent is healthy so you always have a backup. The best time is the active growing season of spring and summer, when cuttings root fastest.

Stem cuttings

Snip a healthy length of stem several inches long, ideally with multiple leaves and at least a couple of nodes (the points where leaves attach). Strip the leaves from the bottom inch or so to expose bare nodes, since roots emerge from there. Let the cut end callus, sitting dry for a day or two, which lets the wound seal and dramatically reduces the chance of rot once it touches soil.

Then lay the cutting on top of, or shallowly insert the bare nodes into, a pot of succulent mix. Keep the soil barely moist, just a light misting or sip every few days, until roots establish, then switch to the normal soak-and-dry routine. You can lay several cuttings across the surface of one pot to build a full, bushy plant faster. Some growers root cuttings in water first, but soil rooting tends to produce sturdier roots and avoids the shock of transferring water-grown roots to dry mix.

Layering for a fuller pot

To thicken an existing plant without cutting anything, take a long trailing stem and pin a section of it down onto the soil surface (a bent paperclip works) so the nodes contact the mix. Roots form where the stem meets soil while it is still attached to and fed by the parent. Once the new roots are established you can cut the strand free, leaving a denser, fuller plant. This low-risk method is great for a rare plant you do not want to gamble with. For another easy-to-multiply trailing succulent, see our guide to string of turtles care.

Common Problems and Fixes

The two diagnostic problems are shape loss and rot. Leaves losing their dolphin shape and flattening, with stretched, leggy stems, means too little light; move the plant much brighter or add a grow light. Mushy, yellow, translucent leaves and a soft brown stem base means overwatering and rot; stop watering, improve drainage, and salvage healthy cuttings if the rot is advancing. Shriveled, deflating leaves in a plant that has gone bone-dry for a long stretch means underwatering, easily fixed with a thorough soak. Brown, scorched patches on leaves point to too much harsh direct sun, so dial back the most intense afternoon exposure.

Pests are infrequent but mealybugs are the usual suspect, appearing as white cottony tufts tucked among the leaves and stem joints; aphids and scale show up occasionally too. Dab mealybugs with a rubbing-alcohol swab, or treat the plant with insecticidal soap or diluted neem oil, repeating weekly until the infestation clears. Always isolate and inspect a new plant before setting it next to your others. For more sun-loving, low-water houseplants to pair with it, explore our plants and flowers hub.