Fertilizer for String of Pearls: NPK Guide and Application Rates
String of Pearls (Senecio rowleyanus) is a delicate trailing succulent with distinctive bead-like leaves. It is particularly sensitive to over-fertilizing and overwatering, which are the two most common causes of plant death. A very light touch with succulent fertilizer during the active growing season is all this plant needs.
Quick Reference
What NPK Ratio is Best for String of Pearls?
The recommended NPK ratio for string of pearls is 2-7-7. The phosphorus-heavy 2-7-7 ratio supports strong root systems and flower/fruit production in string of pearls.
String of Pearls NPK needs shift at each growth stage. Very dilute balanced feed for new stem cuttings during the Seedling phase, then small white flowers may appear; no adjustment needed once flowering begins.
NPK by Growth Stage for String of Pearls
| Growth Stage | NPK Ratio | Notes |
|---|---|---|
| Seedling | 5N 5P 5K N 5% Nitrogen: leaf and stem growth P 5% Phosphorus: roots and flowers K 5% Potassium: health and disease resistance Learn more about NPK | Very dilute balanced feed for new stem cuttings |
| Vegetative | 2N 7P 7K N 2% Nitrogen: leaf and stem growth P 7% Phosphorus: roots and flowers K 7% Potassium: health and disease resistance Learn more about NPK | Low nitrogen succulent formula for trailing bead growth |
| Flowering | 2N 7P 7K N 2% Nitrogen: leaf and stem growth P 7% Phosphorus: roots and flowers K 7% Potassium: health and disease resistance Learn more about NPK | Small white flowers may appear; no adjustment needed |
| Fruiting | 2N 7P 7K N 2% Nitrogen: leaf and stem growth P 7% Phosphorus: roots and flowers K 7% Potassium: health and disease resistance Learn more about NPK | N/A for succulent houseplant use |
When Should You Fertilize String of Pearls?
In zone 9, start fertilizing string of pearls in undefined. In zone 11, begin as early as undefined. Apply every 8 weeks through the growing season.
Which Zones Can Grow String of Pearls?
String of Pearls grows in USDA zones 9 through 11, spanning a 3-zone range.
Fertilization Start by Zone
| Zone | Start Month |
|---|---|
| Zone indoor | March |
What Are the Best Fertilizer Products for String of Pearls?
Look for products with an NPK close to 2-7-7. Schultz Cactus Plus 2-7-7 is the most popular choice among home gardeners for string of pearls.
- Schultz Cactus Plus 2-7-7
- Miracle-Gro Succulent Plant Food
- Espoma Organic Cactus Food
Prices vary by retailer and region. Check current pricing before purchasing.
Container and Raised Bed Adjustments for String of Pearls
Use succulent fertilizer at half strength every 6-8 weeks in spring and summer; these trailing succulents are very sensitive to overfeeding
Common Fertilizing Mistakes with String of Pearls
- Over-fertilizing this extremely sensitive succulent
- Confusing watering problems for fertilizer deficiency
- Using regular potting soil that retains too much moisture and fertilizer salts
- Fertilizing a plant that is already stressed from overwatering
- Applying fertilizer during winter rest when the plant is semi-dormant
Tips for Fertilizing String of Pearls
- Feed only 2-3 times during spring and summer at half strength
- Shriveling beads usually indicate watering issues, not nutrient deficiency
- Use a well-draining succulent soil to prevent fertilizer salt accumulation
- This plant is very fragile - handle gently when watering with fertilizer
- Bright indirect light is essential for bead production alongside any feeding program
Organic Fertilizer Alternatives for String of Pearls
Sources
Source:University of Arizona Cooperative ExtensionLast updated: