String of Dolphins

String of Dolphins (Curio × peregrinus) — Care and Troubleshooting

String of Dolphins became one of the most photographed plants on social media within months of entering the houseplant market — and for good reason. Each leaf of Curio × peregrinus is shaped like a tiny leaping dolphin, with a transparent 'window' along the top and two small fins on either side. When a trailing stem has 30 or 40 of these leaves, the visual effect is of a school of dolphins mid-leap. It's genuinely unusual.

As a naturally occurring hybrid between Curio rowleyanus (String of Pearls) and Curio articulatus (Candle Plant), it inherits traits from both parents. From String of Pearls: the trailing habit, small succulent leaves, and light requirements. From Candle Plant: the unusual leaf shape and slightly faster growth rate. It also inherits from both parents a sensitivity to overwatering that makes it more demanding than its cute appearance suggests.

Why Dolphins Lose Their Shape

The characteristic dolphin shape — the crescent, the fins, the window — depends on specific growing conditions. Owners frequently find that the dolphin shape becomes less pronounced over time, with new leaves emerging less distinctly dolphin-shaped and more generically blobby. This happens primarily from:

1. Insufficient light: In low light, the plant produces simplified leaf shapes to maximize photosynthetic surface area. The dolphin characteristics are less pronounced in dim conditions. 2. Overwatering: Overfed leaves swell beyond the ideal shape, losing their crisp crescent form. 3. High temperature: In environments above 80°F, leaves tend to be less distinctly shaped.

The fix for all three: bright indirect light (close to a window), appropriate infrequent watering, and cooler temperatures.

Light Requirements

String of Dolphins needs bright indirect light — closer to a window than String of Pearls needs. A windowsill position (but protected from direct afternoon sun) is ideal. East-facing windows work well. In low light, growth continues but the dolphin shapes become less distinct and the stems trail less densely.

Watering — the Critical Skill

This is more demanding to water than String of Pearls. The dolphin-shaped leaves hold less water per leaf than the round pearls of its close relative, meaning it dries out slightly faster. However, the roots are equally sensitive to overwatering. The correct approach:

• Check the top inch of the mix and water once it's dried out there
• During the growing season that check typically lands somewhere between weekly and every other week
• Once winter dormancy hits, the interval stretches to roughly a month between waterings
• Bottom watering (setting the pot in a tray of water and allowing it to wick up) is preferred — avoids getting water on the leaves and encourages deep root growth
• Ensure full drainage after watering; never leave in standing water

Common Problems

Flat or indistinct leaf shapes: The dolphin form requires adequate light and appropriate watering. Move to brighter location; reduce watering slightly.

Mushy or translucent leaves: Overwatering. Allow to dry completely; remove affected leaves and stems; check roots.

Shriveling leaves: Underwatering. The crescent shape deflates and shrivels. Water thoroughly; leaves should plump within 24–48 hours.

Pale, elongated growth: Insufficient light causing etiolation. The stems grow longer with more space between leaves. Move closer to window.

Leaves dropping: More fragile than some trailing succulents but less so than Burro's Tail. Dropping from touch or vibration is normal; widespread dropping indicates stress (overwatering most commonly).

A Genuinely Recent Hybrid

Unlike most popular houseplants, which have been in cultivation for decades or centuries, Curio × peregrinus is a relatively recent horticultural discovery, first noted as a spontaneous hybrid arising where String of Pearls and Candle Plant were grown together, then deliberately propagated and named once its distinctive dolphin-shaped leaves were recognized as commercially compelling. Its rapid rise to popularity through social media photos happened within just a few years of its wider availability, an unusually fast path from obscure hybrid curiosity to mainstream houseplant compared to the much longer histories behind plants like pothos or peace lily.

Why It's Considered Harder Than String of Bananas

Of the three closely related Curio trailing succulents commonly compared to each other, String of Dolphins generally sits as the most demanding to keep looking its best, more particular about consistent bright light than String of Bananas and slightly less forgiving of watering lapses, even though all three share the same basic succulent care framework. This is largely because the dolphin leaf shape itself is a more delicate, complex structure to maintain than the simpler banana or pearl leaf forms, showing shape degradation from imperfect conditions more readily and more visibly than its more robust relatives, which is worth knowing before choosing between the three for a first attempt at this general plant family.

Best Display Conditions

Because the dolphin shape is the whole appeal of this plant, giving it the brightest possible indirect light and a stable spot near an east or bright north window, rather than treating it as a flexible fill-in plant for a dimmer corner the way a more shade-tolerant trailing plant might be used, protects the investment in this more particular, more visually striking succulent. A hanging position that lets the trailing stems cascade freely without obstruction also shows off the leaping-dolphin visual effect far better than a cramped shelf placement where stems are forced to bend or double back.

Limited Supply and Higher Typical Price

Because String of Dolphins is propagated more slowly and in smaller commercial volumes than String of Pearls or String of Bananas, and because demand spiked quickly once the plant became popular online, it has generally carried a noticeably higher price tag per stem length than its more established relatives, particularly for larger, fuller hanging specimens. This supply-and-demand gap has eased somewhat as more growers have propagated it at scale over time, but it's still worth expecting to pay a premium for a well-filled String of Dolphins pot compared to an equivalently sized String of Pearls or String of Bananas.