The String of Hearts ( Ceropegia woodii ), a trailing succulent vine with heart-shaped leaves, is a popular, low-maintenance houseplant. While generally easy to care for, proper fertilization enhances its growth, promotes vibrant foliage, and encourages its small, tubular flowers. This guide explains how to effectively fertilize your String of Hearts for continued health and beauty.
String of Hearts Nutritional Requirements
The String of Hearts, a succulent-like plant native to arid regions of South Africa, does not require heavy feeding. However, essential nutrients benefit robust growth, vibrant leaf coloration, and flowering, especially during its active growing season from spring through summer.
During fall and winter, the String of Hearts enters dormancy, and its growth slows. Fertilization should be reduced or stopped entirely during this time, as nutrient needs decrease. Fertilizing during dormancy can lead to salt buildup in the soil, potentially harming the plant.
Selecting the Best Fertilizer
A balanced liquid houseplant fertilizer is recommended for String of Hearts. Look for a formula with an NPK ratio (nitrogen, phosphorus, and potassium) like 10-10-10 or 20-20-20. Nitrogen supports leaf development, phosphorus aids root and flower growth, and potassium contributes to overall plant health. A slightly higher phosphorus content, such as a 5-10-5 ratio, can encourage blooms.
Dilute liquid fertilizers to half or even quarter strength, as String of Hearts are sensitive to over-fertilization. This dilution prevents root burn and salt buildup. Organic options like worm castings or compost tea can also provide a slower, more gentle release of nutrients.
Proper Fertilizer Application
When applying liquid fertilizer, dilute it more than package instructions, using a half-strength or even quarter-strength solution to prevent root damage. Ensure the soil is moist before fertilizing to prevent root burn.
During the active growing season (spring through summer), fertilize your String of Hearts every 2 to 4 weeks. Stop fertilizing completely during its dormant period in fall and winter. Apply the diluted solution directly to the soil around the plant’s base, avoiding leaves or stems to prevent burns.
Addressing Fertilization Problems
Over-fertilization is a common issue that can harm String of Hearts plants. Signs include crispy or browning leaf edges, stunted growth, and a white crust forming on the soil surface due to salt buildup. If these symptoms appear, flush the soil thoroughly with plain water to wash away excess salts.
Under-fertilization, while less immediately damaging, can also affect plant health. Symptoms may include slow growth, pale or yellowing leaves, and leaves that are smaller than usual. To avoid these problems, consistently use diluted fertilizer during the active growing season. Avoid fertilizing stressed or newly repotted plants, as their root systems are more vulnerable to damage.