Fertilizer for Sedum: NPK Guide and Application Rates
Sedums (Stonecrop) are versatile succulents ranging from low-growing groundcovers to tall upright varieties like 'Autumn Joy'. They thrive in lean, well-drained soils and need minimal to no fertilizer. Rich soil and excess fertilizer cause tall varieties to flop and groundcovers to grow leggy and sparse.
Quick Reference
What NPK Ratio is Best for Sedum?
The recommended NPK ratio for sedum is 5-10-5. The phosphorus-heavy 5-10-5 ratio supports strong root systems and flower/fruit production in sedum.
Sedum NPK needs shift at each growth stage. Light balanced feed for new sedum divisions or cuttings during the Seedling phase, then same formula works for flowering varieties like autumn joy once flowering begins.
NPK by Growth Stage for Sedum
| 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 | Light balanced feed for new sedum divisions or cuttings |
| Vegetative | 5N 10P 5K N 5% Nitrogen: leaf and stem growth P 10% Phosphorus: roots and flowers K 5% Potassium: health and disease resistance Learn more about NPK | Low nitrogen prevents leggy growth; phosphorus supports roots |
| Flowering | 5N 10P 5K N 5% Nitrogen: leaf and stem growth P 10% Phosphorus: roots and flowers K 5% Potassium: health and disease resistance Learn more about NPK | Same formula works for flowering varieties like Autumn Joy |
| Fruiting | 5N 10P 5K N 5% Nitrogen: leaf and stem growth P 10% Phosphorus: roots and flowers K 5% Potassium: health and disease resistance Learn more about NPK | N/A for ornamental sedum use |
When Should You Fertilize Sedum?
In zone 3, start fertilizing sedum in undefined. In zone 9, begin as early as undefined. Apply every 12 weeks through the growing season.
Which Zones Can Grow Sedum?
Sedum grows in USDA zones 3 through 9, spanning a 7-zone range.
Fertilization Start by Zone
| Zone | Start Month |
|---|---|
| Zone indoor | March |
What Are the Best Fertilizer Products for Sedum?
Look for products with an NPK close to 5-10-5. Schultz Cactus Plus is the most popular choice among home gardeners for sedum.
- Schultz Cactus Plus
- Espoma Organic Cactus Food
- Miracle-Gro Succulent Plant Food
Prices vary by retailer and region. Check current pricing before purchasing.
Container and Raised Bed Adjustments for Sedum
Container sedum needs a single spring feeding at half strength; garden sedum rarely needs supplemental fertilizer
Common Fertilizing Mistakes with Sedum
- Fertilizing sedums in rich garden soil, causing floppy, weak growth
- Using nitrogen-heavy fertilizer that creates leggy, unattractive plants
- Treating sedums like typical perennials that need regular feeding
- Adding too much compost or amendments to succulent-adapted plants
- Fertilizing in fall when sedums should be hardening off for winter
Tips for Fertilizing Sedum
- Garden sedums in average soil rarely need any fertilizer
- Container sedums benefit from a single light spring feeding
- Tall sedums (Autumn Joy, Matrona) that flop are likely over-fertilized or over-shaded
- Lean soil produces the best color and most compact growth in sedums
- A light compost top-dressing in spring is usually sufficient nutrition
Organic Fertilizer Alternatives for Sedum
Sources
Source:West Virginia University Extension - Succulents 101Last updated: