The “String of Raindrops,” scientifically known as Curio herreanus, is a distinctive, trailing succulent prized for its unique, tear-shaped foliage. This South African native has thin, cascading stems adorned with plump, bead-like leaves that possess a translucent “window” allowing light into the leaf’s interior, a common adaptation in desert succulents. Its easy-care nature makes it a popular choice for indoor gardeners. Because it stores water in its leaves, this plant tolerates periods of neglect, offering an approachable entry point into succulent keeping.
Ideal Light and Temperature Conditions
The String of Raindrops thrives in bright, indirect light, which mimics its natural environment where it receives filtered sun. Placing the plant near an east or west-facing window is optimal, providing several hours of gentle light without the harsh intensity of midday sun. Insufficient light will cause the stems to stretch out, resulting in “etiolated” or leggy growth. Conversely, exposing the fleshy leaves to intense, direct afternoon sunlight can lead to leaf scorching.
Maintaining a consistent temperature range between 60°F and 80°F (15°C to 27°C) supports healthy growth. As a desert-adapted species, this plant is not tolerant of cold temperatures and must be protected from frost. Keep the plant away from cold drafts from windows or air conditioning vents.
Proper Watering and Soil Mix
Improper watering is the most common cause of failure for trailing succulents like Curio herreanus, which require a specific approach known as the “soak and dry” method. When watering, apply water thoroughly until it flows freely from the pot’s drainage holes, ensuring the entire root ball is saturated. Following this deep watering, the soil must be allowed to dry out completely before water is applied again.
The plump, raindrop-shaped leaves indicate the plant is storing water. During the active growing season, this often translates to watering every one to three weeks, depending on ambient temperature and humidity. The watering frequency should be significantly reduced in the winter months when the plant enters a period of dormancy, sometimes requiring water only once a month.
A highly porous, well-draining succulent or cactus mix is necessary. Standard potting soil retains too much moisture, creating an environment where the roots are susceptible to rot. To enhance drainage, incorporate amendments such as coarse sand, perlite, or pumice into the soil mix.
Pruning, Repotting, and Propagation
Pruning the String of Raindrops is done to maintain shape, control stem length, or address damaged stems. Using clean, sharp scissors or shears, stems can be cut just above a node or a healthy leaf cluster. Pruning encourages the plant to branch out, resulting in a denser appearance. Remove any shriveled, dried out, or mushy stems immediately.
Repotting is necessary every two to three years or when the plant has completely filled its current container with roots. The best time to repot is during the spring or early summer. When selecting a new container, choose one that is only slightly larger than the current pot, as an oversized container can lead to excess soil remaining wet for too long.
Propagation is easily achieved using stem cuttings. Cut a healthy stem section and allow the cuttings to dry in open air for two to three days until the cut end forms a protective, dry layer called a callus.
Once calloused, the cuttings can be laid directly on top of moist, well-draining succulent soil or inserted slightly into the substrate. Roots typically begin to develop from the nodes within a few weeks.