String of Tears (Curio herreanus) and String of Pearls (Curio rowleyanus) are captivating succulent plants, sought after for their unique trailing foliage. They make appealing additions to indoor spaces, draping gracefully from hanging baskets or shelves. This article clarifies the distinctions between these two popular plants and provides guidance for their care.
Identifying the Differences
Leaf Shape and Size
The most apparent distinction lies in their foliage. String of Pearls (Curio rowleyanus) has small, spherical, pea-like leaves, typically less than a quarter-inch in diameter. These leaves are nearly perfectly round and feature a small, translucent stripe or “window” on one side, allowing light to penetrate for photosynthesis. In contrast, String of Tears (Curio herreanus) possesses more elongated, teardrop-shaped leaves, often resembling small green olives. These leaves are generally larger, reaching up to half an inch in length, and lack the distinctive transparent window.
Growth Habit
Their growth habits also present differences. String of Pearls produces delicate, thin stems with uniformly spaced, bead-like leaves, creating a fine, cascading appearance. Its growth can be dense, forming a curtain of small spheres. String of Tears typically develops slightly thicker stems, supporting its larger, more robust teardrop-shaped leaves. This gives it a fuller, more substantial trailing habit compared to the delicate nature of the String of Pearls.
Care Requirements
Light
Both plants thrive in bright, indirect light. Placing them near a south or west-facing window, where they receive ample ambient light without direct scorching sun, is ideal. Direct, intense sunlight can lead to leaf burn and discoloration. Insufficient light can result in leggy growth, widely spaced leaves, and a loss of vibrant green color. Rotating the plant periodically ensures even exposure and promotes balanced growth.
Watering
Proper watering is crucial, as they are highly susceptible to root rot from overwatering. The “soak and dry” method is recommended, allowing the soil to dry out completely between waterings. Check soil moisture by inserting a finger about an inch or two deep; if dry, water thoroughly until it drains from the pot bottom. String of Pearls leaves may slightly pucker or lose plumpness when thirsty, indicating a need for water.
Soil
A well-draining soil mix is paramount. A specialized succulent or cactus potting mix is suitable, providing aeration and preventing water retention. Adding perlite or coarse sand to a standard potting mix further enhances drainage. Good drainage holes in the pot are also essential to prevent waterlogging.
Temperature and Humidity
These succulents prefer average room temperatures, typically 65°F to 80°F (18°C to 27°C). They tolerate slightly cooler temperatures during winter but need protection from freezing. Both are accustomed to arid environments and do not require high humidity. Typical household humidity levels are sufficient.
Fertilizing
They are not heavy feeders and benefit from minimal fertilization. During their active growing season (spring and summer), apply a balanced liquid fertilizer at half or quarter strength once every two to four weeks. Avoid fertilizing during dormant winter months, as growth slows. Over-fertilization can lead to nutrient burn.
Propagating Your Plants
Propagating both plants is straightforward through stem cuttings. Snip a healthy stem segment at least 3-4 inches long with several leaves. Allow the cut end to callus for a day or two in a dry, airy location to prevent rot. Place the callused cutting directly on moist succulent potting mix or gently insert the end into the soil. Consistent, indirect light and light moisture encourage rooting within weeks.
Common Problems and Solutions
Overwatering is the most common issue, leading to mushy, discolored, or yellowing leaves and root rot. If symptoms appear, reduce watering frequency and ensure soil dries completely between applications. Underwatering causes leaves to shrivel, flatten, or become dry, indicating a need for thorough watering.
Pests like mealybugs or aphids can occasionally infest these plants, appearing as small, cottony masses or tiny insects on stems and leaves. A gentle wipe with a cotton swab dipped in rubbing alcohol or insecticidal soap effectively removes them. Legginess or sparse growth, where stems become long with widely spaced leaves, signals insufficient light. Moving the plant to a brighter location encourages compact, robust growth.