Best Organic Herb Fertilizer (8-3-5): Slow-Release Nutrition That Enhances Essential Oil Production & Herb Flavor Intensity Buy on Old Cobblers Farm
Herbs are grown for flavor — and flavor comes from essential oils. Sulfur from langbeinite enhances the sulfur-containing compounds in basil, cilantro, and garlic chives, while slow-release nitrogen produces steady leaf growth without the watery, diluted flavor that synthetic fast-feeding creates.
Old Cobblers Farm™ Wicked Organics Organic Herb Fertilizer
by Organic Fertilizer — Littleton, NH
Enhances Essential Oil Production
Sulfur from langbeinite is a building block of the sulfur-containing amino acids that produce essential oils in basil, cilantro, oregano, and all aromatic herbs. More sulfur = more intense flavor.
Slow Release = Concentrated Flavor
Fast synthetic nitrogen produces rapid, watery leaf growth that dilutes essential oil concentration. Slow organic release grows herbs at a natural pace — concentrated foliage packed with flavor compounds.
Per-Plant Micro-Dosing
1 tablespoon per plant monthly — herbs are small and sensitive. This micro-dose rate prevents over-feeding while providing steady nutrition through the harvest season.
160 Plants Per Bag
At 1 tbsp per plant, one 5 lb bag feeds approximately 160 individual herb plants per application. One bag can last a kitchen herb garden for an entire season.
Sulfur + Magnesium + Calcium
Three secondary nutrients that most herb fertilizers lack entirely. Magnesium for chlorophyll, calcium for cell structure, sulfur for flavor compounds.
Indoor & Outdoor Use
Same formula works for windowsill herb pots, outdoor kitchen gardens, raised beds, and greenhouse production. Per-plant dosing scales to any setup.
All Culinary Herbs
Basil, cilantro, parsley, rosemary, thyme, oregano, sage, mint, dill, chives, lavender — every herb responds to slow organic feeding with more intense aroma and flavor.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 8-3-5 |
| Item Form | Granular |
| Coverage | ~160 plants per 5 lb bag (per-plant rate) |
| Category | Organic Fertilizer |
| Type | Plant-Specific Organic |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| NPK | 8-3-5 |
| Nitrogen | 8% (animal protein) |
| Phosphorus | 3% |
| Potassium | 5% (langbeinite) |
| Secondary | Sulfur, Magnesium, Calcium |
| Form | Granular |
| Rate | 1 tbsp / plant monthly |
| Method | Side-dress or planting hole |
| Sizes | 5, 10, 15, 20 lb bags |
| Best For | Basil, cilantro, parsley, rosemary, thyme, oregano, all culinary herbs |
| Feature | Old Cobblers Farm™ Wicked Organics Organic Herb Fertilizer Old Cobblers Farm | Bio-Turf Organic Fertilizer Down to Earth | NatureStar All Purpose Organic Nelson Plant Food | Garden-tone Herb & Vegetable Espoma Organic | Organic 5 Tomato, Veg & Herb Dr. Earth | Herb & Leafy Greens Food True Organic | Tomato, Vegetable & Herb Kellogg Garden | Herb Granular Fertilizer Jobe's Organics | Performance Organics Edibles Miracle-Gro | Organic Herb Fertilizer Urban Farmer | Happy Frog Tomato & Veg FoxFarm | Bio-Turf Down To Earth | Herb Granular Jobe's Organics | Home Grown Herb Fertilizer Dr. Earth | Garden-Tone Espoma | Herb & Leafy Greens Food True Organic | Happy Herbs Organic Happy Nutrients | Happy Frog All-Purpose FoxFarm | Natural Organic All Purpose Burpee | Stonington Blend Coast of Maine | Plant-Tone Espoma |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 8-3-5 | 8-3-5 | 8-3-5 | 3-4-4 | 4-6-3 | 4-4-6 | 4-6-3 | 4-4-3 | 9-4-12 | 3-6-6 | 5-7-3 | 8-3-5 | 4-3-6 | 4-6-3 | 3-4-4 | 4-4-4 | 6-3.5-7 | 6-4-5 | 4-4-4 | 5-2-4 | 5-3-3 |
| Form | Granular | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Coverage | ~160 plants per 5 lb bag (per-plant rate) | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | 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 | $20-$60 | $12-$63 | $10-$25 | $15-$30 | $15 | $10 | $10-$18 | $9-$20 | $25-$85 | $18-$22 | $12-16 (4 lb) | $7-10 (1 lb) | $8-12 (4 lb) | $8 (4 lb) | $9-12 (4 lb) | $15-20 (12 oz) | $12-16 (4 lb) | $10-13 (4 lb) | $16-22 (4 lb) | $11 (4 lb) |
| Our Take | The herb specialist that prioritizes flavor over volume. Slow-relea... | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Bio-Turf Organic Fertilizer
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Happy Frog All-Purpose
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Plant-Tone
Enhances Essential Oil Production
Sulfur from langbeinite is a building block of the sulfur-containing amino acids that produce essential oils in basil, cilantro, oregano, and all aromatic herbs. More sulfur = more intense flavor.
Slow Release = Concentrated Flavor
Fast synthetic nitrogen produces rapid, watery leaf growth that dilutes essential oil concentration. Slow organic release grows herbs at a natural pace — concentrated foliage packed with flavor compounds.
Per-Plant Micro-Dosing
1 tablespoon per plant monthly — herbs are small and sensitive. This micro-dose rate prevents over-feeding while providing steady nutrition through the harvest season.
160 Plants Per Bag
At 1 tbsp per plant, one 5 lb bag feeds approximately 160 individual herb plants per application. One bag can last a kitchen herb garden for an entire season.
