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

Citrus trees are year-round feeders that bloom and fruit simultaneously — they never fully go dormant. This 4-6-4 organic formula delivers the steady, biologically-driven nutrition citrus demands, with 6% phosphorus for bloom and fruit set and 4% potassium for juice quality and rind strength.

Updated April 2026 17 Products Compared By the Old Cobblers Farm Team

Old Cobblers Farm™ Wicked Organics Organic Citrus Fertilizer

by Organic Fertilizer — 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
Item FormGranular
Coverage170–250 sq ft per 5 lb bag
CategoryOrganic Fertilizer
TypePlant-Specific Organic
Sizes5 lb | 10 lb | 15 lb | 20 lb
NPK4-6-4
Nitrogen4%
Phosphorus6%
Potassium4%
BaseNCO Pro-Holly
FormGranular
Rate1 lb / 2 ft crown or 2–3 tbsp / gal soil
MethodBroadcast or container top-dress
Frequency2–3x per year
Sizes5, 10, 15, 20 lb bags
Best ForLemon, lime, orange, grapefruit, all citrus — container and in-ground
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 Old Cobblers Farm Citrus-Tone Organic Fertilizer Espoma Citrus Mix 6-3-3 Down To Earth Sweet & Sour Citrus Fertilizer Dr. Earth Fruit & Citrus Granular Fertilizer Jobe's Organics Happy Frog Citrus & Avocado Fertilizer FoxFarm Citrus & Fruit Tree Food E.B. Stone Organics Fish & Seaweed Blend (liquid, used for citrus) Neptune's Harvest Citrus-Tone Espoma Citrus Mix Down To Earth Fruit & Citrus Jobe's Organics Happy Frog Citrus & Avocado FoxFarm Sweet & Sour Citrus Dr. Earth Citrus & Avocado Food True Organic Fruit, Citrus & Berry G&B Organics Citrus & Fruit MicroLife Natural Wonder Fruit Tree Dr. Earth Fruit Tree Mix Down To Earth
NPK 4-6-4 5-2-6 6-3-3 6-3-3 3-5-5 7-3-3 7-3-3 2-3-1 5-2-6 6-3-3 3-5-5 7-3-3 6-3-3 4-5-4 6-4-2 6-2-4 5-5-2 6-2-4
Form Granular — — — — — — — — — — — — — — — — —
Coverage 170–250 sq ft per 5 lb bag 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 $12–$14 / 4 lb $15–$18 / 5 lb $10–$14 / 4 lb $10–$14 / 4 lb $16–$20 / 4 lb $13–$16 / 4 lb $16–$20 / 36 oz ~$14-16 (4 lb) ~$16-20 (5 lb) ~$10-12 (4 lb) ~$15-18 (4 lb) ~$9-11 (4 lb) ~$10 (4 lb) ~$10-15 (4 lb) ~$25-35 (7 lb) ~$9-13 (4 lb) ~$16-20 (5 lb)
Our Take The organic citrus formula for year-round feeders. 4-6-4 from compo... 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. 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. 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. 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. 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. 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. 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. — — — — — — — — — —
The Competition

Citrus-Tone Organic Fertilizer

by Espoma
5-2-6
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
6-3-3
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
6-3-3
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
3-5-5
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
7-3-3
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
7-3-3
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
2-3-1
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
5-2-6
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
6-3-3
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
3-5-5
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
7-3-3
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
6-3-3
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
4-5-4
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
6-4-2
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
6-2-4
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
5-5-2
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
6-2-4
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