Organic Citrus Specialist

Best Organic Citrus Fertilizer (4-6-4): Slow-Release Nutrition for Juicier Fruit, Stronger Blooms & Healthier Citrus Trees Year-Round Buy on Old Cobblers Farm

Updated April 2026 By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Organics Organic Citrus Fertilizer

by Wicked Organics — Littleton, NH

4-6-4
N-P-K Ratio
"The organic citrus formula for year-round feeders. 4-6-4 from composted manure and natural minerals provides the continuous, gentle nutrition citrus trees need — supporting simultaneous bloom, fruit development, and vegetative growth without the salt stress of synthetic fertilizers."
4-6-4
Organic NPK
6%
Phosphorus for Bloom
2–3x
Applications / year
4 Sizes
5, 10, 15, 20 lbs
🍋

Built for Citrus Biology

Citrus trees bloom and fruit continuously — they need nutrition year-round. The slow-release organic base feeds steadily between applications without the feast-famine cycle of synthetics.

🌸

6% Phosphorus for Bloom & Fruit Set

Citrus flower heavily — and every bloom that sets becomes a fruit. 6% phosphorus supports the heavy flower production that determines your citrus yield.

🍊

4% Potassium for Juice Quality

Potassium drives sugar content, juice volume, and rind thickness in citrus fruit. Adequate K produces sweeter, juicier oranges, lemons, and limes.

📅

2–3 Applications Per Year

Feed in spring, summer, and early fall. Citrus trees are heavier feeders than most fruit trees — they need consistent nutrition to support year-round production.

🏠

Container Citrus Ready

Most northern citrus growers keep trees in containers. Same formula works for indoor winter growing and outdoor summer placement. 2–3 tbsp per gallon of soil for containers.

🐔

Full-Spectrum Organic Nutrition

Composted manure delivers trace minerals and micronutrients — iron, zinc, manganese — that citrus trees need for green foliage and healthy fruit development.

✅

All Citrus Varieties

Lemon, lime, orange, grapefruit, tangerine, kumquat, Meyer lemon, Key lime, Calamondin — every citrus variety benefits from this organic feeding program.

🇺🇸

Trusted by 20,000+ Growers

Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.

NPK Ratio4-6-4
Derived FromComposted chicken manure, Natural mineral phosphate sources, Natural potassium sources (NCO Pro-Holly base)
Item FormGranular
Release SpeedSlow-release (biologically driven)
Application Rate2–3 lbs / 100 sq ft | 1 lb / 2 ft crown diameter (2–3x per year)
MethodBroadcast under drip line or around container rim
Frequency2–3x per year (spring, summer, early fall)
Sizes5 lb | 10 lb | 15 lb | 20 lb
SupportsLemon, lime, orange, grapefruit, tangerine, kumquat, Meyer lemon, Key lime, Calamondin, all citrus
SetupsContainer citrus, indoor/outdoor pots, greenhouse, in-ground (warm climates)
What We Love
✓ Built for year-round citrus feeding — bloom and fruit simultaneously
✓ 6% phosphorus supports heavy flower production and fruit set
✓ Container and in-ground application rates included
✓ Full-spectrum composted manure with trace minerals
✓ Works for all citrus varieties — lemon, lime, orange, grapefruit
Worth Noting
— Lower NPK than synthetic citrus formulas — apply more frequently
— Container citrus in cold climates needs supplemental light and warmth too
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
Feature Old Cobblers Farm™ Wicked Organics Organic Citrus Fertilizer Citrus-Tone Organic Fertilizer Citrus Mix 6-3-3 Sweet & Sour Citrus Fertilizer Fruit & Citrus Granular Fertilizer Happy Frog Citrus & Avocado Fertilizer Citrus & Fruit Tree Food Fish & Seaweed Blend (liquid, used for citrus) Citrus-Tone Citrus Mix Fruit & Citrus Happy Frog Citrus & Avocado Sweet & Sour Citrus Citrus & Avocado Food Fruit, Citrus & Berry Citrus & Fruit Natural Wonder Fruit Tree Fruit Tree Mix
NPK 4-6-4 5-2-2006 6-3-2003 6-3-2003 3-5-2005 7-3-2003 7-3-2003 2-3-2001 5-2-2006 6-3-2003 3-5-2005 7-3-2003 6-3-2003 4-5-2004 6-4-2002 6-2-2004 5-5-2002 6-2-2004
Phosphorus 6.0% 2.0% 3.0% 3.0% 5.0% 3.0% 3.0% 3.0% 2.0% 3.0% 5.0% 3.0% 3.0% 5.0% 4.0% 2.0% 5.0% 2.0%
Potassium 4.0% 6.0% 3.0% 3.0% 5.0% 3.0% 3.0% 1.0% 6.0% 3.0% 5.0% 3.0% 3.0% 4.0% 2.0% 4.0% 2.0% 4.0%
Form Granular
Sizes 5 lb | 10 lb | 15 lb | 20 lb 4, 8, 18, 27 lb 1, 5, 15, 25, 50 lb 4, 16 lb 4 lb 4, 12 lb 4, 12, 25 lb 4, 12, 25, 40 lb 7, 40 lb 1, 4, 12, 25 lb 5, 15, 25 lb
Release Speed Slow-release (biologically driven)
The Competition

Citrus-Tone Organic Fertilizer

by Espoma
5-2-2006
N-P-K
Price$12–$14 / 4 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Citrus Mix 6-3-3

by Down To Earth
6-3-2003
N-P-K
Price$15–$18 / 5 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Sweet & Sour Citrus Fertilizer

by Dr. Earth
6-3-2003
N-P-K
Price$10–$14 / 4 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Fruit & Citrus Granular Fertilizer

by Jobe's Organics
3-5-2005
N-P-K
Price$10–$14 / 4 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Happy Frog Citrus & Avocado Fertilizer

by FoxFarm
7-3-2003
N-P-K
Price$16–$20 / 4 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Citrus & Fruit Tree Food

by E.B. Stone Organics
7-3-2003
N-P-K
Price$13–$16 / 4 lb
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Fish & Seaweed Blend (liquid, used for citrus)

by Neptune's Harvest
2-3-2001
N-P-K
Price$16–$20 / 36 oz
Wicked Organics' 4-6-4 is unique in this space — most citrus competitors lean nitrogen-heavy (5-2-6, 6-3-3, 7-3-3). The higher phosphorus supports flowering and fruit set, a genuine differentiator.

Citrus-Tone

by Espoma
5-2-2006
N-P-K
Sizes4, 8, 18, 27 lb
Price~$14-16 (4 lb)
IngredientsFeather meal, poultry manure, bone meal, alfalfa meal, greensand, sulfate of potash; Bio-tone
OrganicOIM Registered

Citrus Mix

by Down To Earth
6-3-2003
N-P-K
Sizes1, 5, 15, 25, 50 lb
Price~$16-20 (5 lb)
IngredientsFeather meal, fish bone meal, alfalfa meal, langbeinite, basalt, potassium sulfate, zinc sulfate, kelp; humates
OrganicOMRI, CDFA

Fruit & Citrus

by Jobe's Organics
3-5-2005
N-P-K
Sizes4, 16 lb
Price~$10-12 (4 lb)
IngredientsBone meal, feather meal, processed manure, sulfate of potash; Biozome
OrganicOMRI Listed

Happy Frog Citrus & Avocado

by FoxFarm
7-3-2003
N-P-K
Sizes4 lb
Price~$15-18 (4 lb)
IngredientsFeather meal, alfalfa meal, fish bone meal; mycorrhizal fungi, calcium, sulfur
OrganicOMRI, CDFA

Sweet & Sour Citrus

by Dr. Earth
6-3-2003
N-P-K
Sizes4, 12 lb
Price~$9-11 (4 lb)
IngredientsOrganic nutrients from land/ocean plants, fish, mined minerals; TruBiotic + mycorrhizae
OrganicCDFA, CCOF, NOP

Citrus & Avocado Food

by True Organic
4-5-2004
N-P-K
Sizes4, 12, 25 lb
Price~$10 (4 lb)
IngredientsPoultry manure, seabird guano, fish bone meal, soybean meal, sulfate of potash, crab/shrimp shell
OrganicOMRI, ISO 22000

Fruit, Citrus & Berry

by G&B Organics
6-4-2002
N-P-K
Sizes4, 12, 25, 40 lb
Price~$10-15 (4 lb)
IngredientsDehydrated poultry manure, bone meal, feather meal, sulfate of potash; mycorrhizal inoculant
OrganicOMRI, CDFA

Citrus & Fruit

by MicroLife
6-2-2004
N-P-K
Sizes7, 40 lb
Price~$25-35 (7 lb)
IngredientsFish, kelp, humates, molasses, rock phosphate, wheat, soy, cottonseed; 76 microbe species
OrganicOrganic professional

Natural Wonder Fruit Tree

by Dr. Earth
5-5-2002
N-P-K
Sizes1, 4, 12, 25 lb
Price~$9-13 (4 lb)
IngredientsFish bone meal, feather meal, kelp, alfalfa, potassium sulfate; TruBiotic
OrganicOMRI, CDFA, CCOF, NOP

Fruit Tree Mix

by Down To Earth
6-2-2004
N-P-K
Sizes5, 15, 25 lb
Price~$16-20 (5 lb)
IngredientsFeather meal, fish bone meal, calcium carbonate, langbeinite, potassium sulfate, alfalfa, humates, kelp
OrganicOMRI, CDFA

🍋

Built for Citrus Biology

Citrus trees bloom and fruit continuously — they need nutrition year-round. The slow-release organic base feeds steadily between applications without the feast-famine cycle of synthetics.

🌸

6% Phosphorus for Bloom & Fruit Set

Citrus flower heavily — and every bloom that sets becomes a fruit. 6% phosphorus supports the heavy flower production that determines your citrus yield.

🍊

4% Potassium for Juice Quality

Potassium drives sugar content, juice volume, and rind thickness in citrus fruit. Adequate K produces sweeter, juicier oranges, lemons, and limes.

📅

2–3 Applications Per Year

Feed in spring, summer, and early fall. Citrus trees are heavier feeders than most fruit trees — they need consistent nutrition to support year-round production.

Common Questions