Best Alpine & Rock Garden Fertilizer (5-10-5): Low Nitrogen for Compact Growth & Deep Roots in Thin Soils Buy on Old Cobblers Farm
Alpine plants evolved in lean, rocky soils. Hit them with a standard fertilizer and they'll go leggy, lose their compact form, and rot out. This 5-10-5 delivers high phosphorus for root anchorage with minimal nitrogen — exactly how alpines want to eat.
Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Plants Fertilizer
by Conventional Fertilizer — Littleton, NH
Built for Alpine Biology
Alpine plants thrive in nutrient-poor conditions. 5% nitrogen keeps growth tight and compact — no leggy, floppy stems that ruin the natural cushion and mat forms alpines are prized for.
10% Phosphorus for Root Anchorage
Alpines survive by driving deep roots into rock crevices and thin substrates. Double the phosphorus relative to N and K fuels that root penetration and anchoring.
Won't Disrupt Rock Garden Aesthetics
Excess fertilizer makes alpines overgrow their stone settings, losing the miniature scale that makes rock gardens beautiful. This formula keeps everything in proportion.
Micro-Dose Application
Just ½ cup per 10 sq ft — a fraction of what vegetables or lawns need. Alpine plants are efficient feeders that thrive on restraint.
220 sq ft Per Bag
One 5 lb bag covers approximately 220 sq ft of rock garden at the recommended rate. That's enough for even a large alpine installation.
Low Burn Risk
With only 20% total NPK and a low application rate, burn risk is minimal — critical for drought-adapted plants growing in fast-draining substrates.
All Alpine & Rock Garden Species
Sedum, thyme, aubrieta, saxifrage, sempervivum, dianthus, alpine phlox, gentian — every rock garden plant benefits from this restrained, P-forward formula.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 5-10-5 |
| Item Form | Granular |
| Coverage | ~220 sq ft rock garden per 5 lb bag |
| Category | Conventional Fertilizer |
| Type | Flower & Garden |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| NPK | 5-10-5 |
| Nitrogen | 5% |
| Phosphorus | 10% available phosphate |
| Potassium | 5% soluble potash |
| Form | Granular |
| Rate | ½ cup / 10 sq ft |
| Method | Light top-dress or side-dress |
| Frequency | 1–2x per season |
| Sizes | 5, 10, 15, 20 lb bags |
| Best For | Sedum, thyme, aubrieta, saxifrage, sempervivum, all alpines |
| Feature | Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Plants Fertilizer Old Cobblers Farm | Succulent Plant Food Miracle-Gro | Cactus! Liquid Plant Food Espoma Organic | Cactus Plus Liquid Plant Food Schultz | Succulent & Cactus Fertilizer Dr. Earth | Cactus & Succulent Plant Food EarthPods | Succulent & Cactus Plant Food The Grow Co | Succulent, Cacti & Aloe Fertilizer Cute Farms | Succulent Fertilizer Pellets Perfect Plants | Liquid Cactus Food Bonide | Cactus & Succulent Supplement Hoffman |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 5-10-5 | 0.5-1-1 | 1-2-2 | 2-7-7 | 1-1-2 | 0.2-0.2-0.4 | 3-1-2 | <1% trace | 13-11-11 | 2-7-7 | 2-4-4 |
| Form | Granular | — | — | — | — | — | — | — | — | — | — |
| Coverage | ~220 sq ft rock garden per 5 lb bag | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed |
| Price / Size | 5 lb | 10 lb | 15 lb | 20 lb | $7 | $10 | $7 | $12-$15 | $20-$25 | $15 | $14 | $13-$15 | $10 | $15 |
| Our Take | The only fertilizer in the lineup purpose-built for alpine and rock... | — | — | — | — | — | — | — | — | — | — |
Succulent Plant Food
Cactus! Liquid Plant Food
Cactus Plus Liquid Plant Food
Succulent & Cactus Fertilizer
Cactus & Succulent Plant Food
Succulent & Cactus Plant Food
Succulent, Cacti & Aloe Fertilizer
Succulent Fertilizer Pellets
Liquid Cactus Food
Cactus & Succulent Supplement
Built for Alpine Biology
Alpine plants thrive in nutrient-poor conditions. 5% nitrogen keeps growth tight and compact — no leggy, floppy stems that ruin the natural cushion and mat forms alpines are prized for.
10% Phosphorus for Root Anchorage
Alpines survive by driving deep roots into rock crevices and thin substrates. Double the phosphorus relative to N and K fuels that root penetration and anchoring.
Won't Disrupt Rock Garden Aesthetics
Excess fertilizer makes alpines overgrow their stone settings, losing the miniature scale that makes rock gardens beautiful. This formula keeps everything in proportion.
Micro-Dose Application
Just ½ cup per 10 sq ft — a fraction of what vegetables or lawns need. Alpine plants are efficient feeders that thrive on restraint.
