Herb-Specific Organic Formula

Best Organic Herb Fertilizer (8-3-5): Slow-Release Nutrition That Enhances Essential Oil Production & Herb Flavor Intensity Buy on Old Cobblers Farm

Updated April 2026 By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Organics Organic Herb Fertilizer

by Wicked Organics — Littleton, NH

8-3-5
N-P-K Ratio
"The herb specialist that prioritizes flavor over volume. Slow-release organic nitrogen produces concentrated, essential-oil-rich leaves instead of fast, watery growth. Sulfur and magnesium from langbeinite enhance the aromatic compounds that make herbs worth growing."
8-3-5
Organic NPK
160
Plants / 5 lb bag
S+Mg+Ca
Flavor-Building Nutrients
4 Sizes
5, 10, 15, 20 lbs
🌿

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 Ratio8-3-5
Derived FromCooked and dehydrated animal by-products (20–40%), Potassium Magnesium Sulfate (15–30%) (Nature Safe base)
Item FormGranular
Release SpeedSlow-release (biologically driven)
Application Rate1 tbsp / plant monthly | 1–2 tbsp / planting hole
MethodSide-dress around plant base or incorporate into planting hole
FrequencyMonthly during growing season
Sizes5 lb | 10 lb | 15 lb | 20 lb
SupportsBasil, cilantro, parsley, rosemary, thyme, oregano, sage, mint, dill, chives, lavender, all culinary herbs
SetupsHerb gardens, containers, windowsill pots, raised beds, kitchen gardens, greenhouse
What We Love
✓ Sulfur enhances essential oil production and herb flavor intensity
✓ Slow release produces concentrated, flavorful leaves — not watery growth
✓ Per-plant micro-dosing — 1 tbsp monthly, won't overfeed herbs
✓ 160 plants per bag — season-long supply for kitchen gardens
✓ Works for all culinary herbs, indoor and outdoor
Worth Noting
— Animal by-product base — not for vegan-organic programs
— Low application rate means not suitable for heavy-feeding vegetables
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
Feature Old Cobblers Farm™ Wicked Organics Organic Herb Fertilizer Bio-Turf Organic Fertilizer NatureStar All Purpose Organic Garden-tone Herb & Vegetable Organic 5 Tomato, Veg & Herb Herb & Leafy Greens Food Tomato, Vegetable & Herb Herb Granular Fertilizer Performance Organics Edibles Organic Herb Fertilizer Happy Frog Tomato & Veg Bio-Turf Herb Granular Home Grown Herb Fertilizer Garden-Tone Herb & Leafy Greens Food Happy Herbs Organic Happy Frog All-Purpose Natural Organic All Purpose Stonington Blend Plant-Tone
NPK 8-3-5 8-3-2005 8-3-2005 3-4-2004 4-6-2003 4-4-2006 4-6-2003 4-4-2003 9-4-12 3-6-2006 5-7-2003 8-3-2005 4-3-2006 4-6-2003 3-4-2004 4-4-2004 6-3.5-7 6-4-2005 4-4-2004 5-2-2004 5-3-2003
Phosphorus 3.0% 3.0% 3.0% 4.0% 6.0% 4.0% 6.0% 4.0% 4.0% 6.0% 7.0% 3.0% 3.0% 6.0% 4.0% 4.0% 3.5% 4.0% 4.0% 2.0% 3.0%
Potassium 5.0% 5.0% 5.0% 4.0% 3.0% 6.0% 3.0% 3.0% 12.0% 6.0% 3.0% 5.0% 6.0% 3.0% 4.0% 4.0% 7.0% 5.0% 4.0% 4.0% 3.0%
Form Granular
Sizes 5 lb | 10 lb | 15 lb | 20 lb 4 lb, 25 lb 3 lb, 40 lb 4 lb, 8 lb 4 lb, 12 lb 4 lb 4 lb 4 lb 1-2.5 lb 3-12 lb 4 lb 4, 6, 25, 50 lb 1 lb, 4 lb 1, 4 lb 4, 8, 18, 36 lb 4 lb 12 oz 4, 18, 50 lb 4 lb 4 lb 4, 8, 18, 36, 50 lb
Release Speed Slow-release (biologically driven)
The Competition

Bio-Turf Organic Fertilizer

by Down to Earth
8-3-2005
N-P-K
Sizes4 lb, 25 lb
Price$20-$60

NatureStar All Purpose Organic

by Nelson Plant Food
8-3-2005
N-P-K
Sizes3 lb, 40 lb
Price$12-$63

Garden-tone Herb & Vegetable

by Espoma Organic
3-4-2004
N-P-K
Sizes4 lb, 8 lb
Price$10-$25

Organic 5 Tomato, Veg & Herb

by Dr. Earth
4-6-2003
N-P-K
Sizes4 lb, 12 lb
Price$15-$30

Herb & Leafy Greens Food

by True Organic
4-4-2006
N-P-K
Sizes4 lb
Price$15

Tomato, Vegetable & Herb

by Kellogg Garden
4-6-2003
N-P-K
Sizes4 lb
Price$10

Herb Granular Fertilizer

by Jobe's Organics
4-4-2003
N-P-K
Sizes4 lb
Price$10-$18

Performance Organics Edibles

by Miracle-Gro
9-4-12
N-P-K
Sizes1-2.5 lb
Price$9-$20

Organic Herb Fertilizer

by Urban Farmer
3-6-2006
N-P-K
Sizes3-12 lb
Price$25-$85

Happy Frog Tomato & Veg

by FoxFarm
5-7-2003
N-P-K
Sizes4 lb
Price$18-$22

Bio-Turf

by Down To Earth
8-3-2005
N-P-K
Sizes4, 6, 25, 50 lb
Price$12-16 (4 lb)
IngredientsHydrolyzed feather meal, blood meal, meat meal, bone meal, langbeinite
OrganicOMRI, CDFA OIM

Herb Granular

by Jobe's Organics
4-3-2006
N-P-K
Sizes1 lb, 4 lb
Price$7-10 (1 lb)
IngredientsBone meal, feather meal, processed manure, sulfate of potash; Biozome
OrganicOMRI Listed

Home Grown Herb Fertilizer

by Dr. Earth
4-6-2003
N-P-K
Sizes1, 4 lb
Price$8-12 (4 lb)
IngredientsFish bone meal, alfalfa meal, feather meal, potassium sulfate; TruBiotic + mycorrhizae
OrganicOMRI, CDFA, NOP

Garden-Tone

by Espoma
3-4-2004
N-P-K
Sizes4, 8, 18, 36 lb
Price$8 (4 lb)
IngredientsFeather meal, poultry manure, bone meal, alfalfa meal, greensand, sulfate of potash; Bio-tone
OrganicOIM Registered

Herb & Leafy Greens Food

by True Organic
4-4-2004
N-P-K
Sizes4 lb
Price$9-12 (4 lb)
IngredientsPoultry manure, seabird guano, fish bone meal, soybean meal, sulfate of potash, crab/shrimp shell
OrganicOMRI, CDFA OIM

Happy Herbs Organic

by Happy Nutrients
6-3.5-7
N-P-K
Sizes12 oz
Price$15-20 (12 oz)
IngredientsKelp extract, sulfate, calcium, trace minerals; water-soluble powder
OrganicOrganic (not OMRI)

Happy Frog All-Purpose

by FoxFarm
6-4-2005
N-P-K
Sizes4, 18, 50 lb
Price$12-16 (4 lb)
IngredientsFeather meal, fish meal, bat guano, sulfate of potash, humic acid; 20 species microbes
OrganicOMRI, CDFA OIM

Natural Organic All Purpose

by Burpee
4-4-2004
N-P-K
Sizes4 lb
Price$10-13 (4 lb)
IngredientsComposted turkey litter, bone meal, feather meal, sulfate of potash; beneficial microbes
OrganicOMRI Listed

Stonington Blend

by Coast of Maine
5-2-2004
N-P-K
Sizes4 lb
Price$16-22 (4 lb)
IngredientsLobster/crab shell, fish meal, kelp meal, worm castings, composted poultry manure
OrganicOMRI, MOFGA

Plant-Tone

by Espoma
5-3-2003
N-P-K
Sizes4, 8, 18, 36, 50 lb
Price$11 (4 lb)
IngredientsFeather meal, poultry manure, bone meal, cocoa meal, cottonseed meal; Bio-tone
OrganicOIM Registered

🌿

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.

Common Questions