High-Phosphorus Organic Bloom Formula
Best Organic Flower Fertilizer (4-6-4): High-Phosphorus Bloom Booster from Composted Chicken Manure & Natural Minerals Buy on Old Cobblers Farm
Flowers need phosphorus to bloom — and organic gardens need it from natural sources. This 4-6-4 delivers the highest phosphorus ratio in the Wicked Organics blended line, from composted chicken manure and natural mineral phosphate, driving flower bud formation and vivid petal color organically.
Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer – Strong Flowers
by Organic Fertilizer — Littleton, NH
4-6-4
N-P-K Ratio
"The organic bloom formula. 6% phosphorus from natural sources — the highest P ratio in the Wicked Organics blended lineup — drives flower bud initiation, petal development, and continuous bloom production in roses, perennials, and all flowering plants."
6%
Phosphorus (P₂O₅)
4-6-4
Organic NPK
250 ft²
Coverage / 5 lb bag
4 Sizes
5, 10, 15, 20 lbs
6% Phosphorus — Highest Organic P Ratio
The highest phosphorus-to-nitrogen ratio in the organic blend line. 6% P from natural mineral phosphate and composted manure fuels flower bud formation and bloom production.
Rose & Flowering Shrub Ready
1 lb per 2 ft of crown diameter at the drip line. Simple per-shrub dosing for roses, hydrangeas, lilacs, azaleas, and all flowering shrubs.
Composted Chicken Manure Base
Composted poultry manure provides a complete spectrum of micro and macro nutrients beyond just NPK — trace minerals, humic compounds, and beneficial microbial diversity.
Biologically-Driven Slow Release
Nutrients release through microbial breakdown of organic matter. Steady feeding aligned to soil temperature and plant growth — no burn risk, no nutrient surge.
Spring + Bud Formation
Apply in spring as growth resumes and again when flower buds begin forming. Two strategic applications aligned to when flowering plants need phosphorus most.
Feeds Soil Biology
Composted manure introduces diverse beneficial microbes while protein and mineral components feed existing soil life. Builds long-term soil health beneath your flowers.
All Flowering Plants
Roses, hydrangeas, lilacs, peonies, azaleas, rhododendrons, annuals, perennials — every flowering plant benefits from phosphorus-forward organic feeding.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 4-6-4 |
| Item Form | Granular |
| Coverage | 170–250 sq ft per 5 lb bag |
| Category | Organic Fertilizer |
| Type | General Purpose Organic |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| NPK | 4-6-4 |
| Nitrogen | 4% |
| Phosphorus | 6% (natural mineral phosphate) |
| Potassium | 4% |
| Form | Granular |
| Rate | 2–3 lbs / 100 sq ft or 1 lb / 2 ft crown |
| Method | Broadcast, drip line, or planting hole |
| Frequency | 2x per season |
| Sizes | 5, 10, 15, 20 lb bags |
| Best For | Roses, hydrangeas, azaleas, perennials, all flowering plants |
What We Love
✓ Highest phosphorus ratio in organic blends — bloom-boosting P
✓ Composted chicken manure delivers full-spectrum nutrition
✓ Per-shrub and per-bed dosing for flexible application
✓ Biologically-driven slow release — no burn risk
✓ Works for all flowering plants from roses to annuals
Worth Noting
— Lower total NPK (14%) than synthetic bloom boosters
— Composted manure has mild odor — dissipates after watering in
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
| Feature | Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer – Strong Flowers Old Cobblers Farm | Rose-tone Organic Fertilizer Espoma | Flower-tone Blossom Booster Espoma | Rose & Flower Mix Down To Earth | Total Advantage Rose & Flower Fertilizer Dr. Earth | Rose & Flower Granular Fertilizer Jobe's Organics | Happy Frog Fruit & Flower Fertilizer FoxFarm | Natural & Organic Rose + Bloom Granular Plant Food Burpee | Rose-Tone Espoma | Total Advantage Rose & Flower Dr. Earth | Rose & Flower Mix Down To Earth | Rose & Flower Granular Jobe's Organics | Happy Frog Rose Food FoxFarm | Happy Frog Fruit & Flower FoxFarm | Organic Rose + Bloom Burpee | Rose & Flower Food True Organic | Rose & Flower Food E.B. Stone | Flower Girl Bud & Bloom Booster Dr. Earth |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 4-6-4 | 4-3-2 | 3-4-5 | 4-8-4 | 4-6-2 | 3-4-3 | 4-9-3 | 4-6-4 | 4-3-2 | 4-6-2 | 4-8-4 | 3-4-3 | 4-4-5 | 4-9-3 | 4-6-4 | 4-5-3 | 5-6-3 | 3-9-4 |
| 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 | $8–$9 / 4 lb; $12 / 8 lb | $8–$10 / 4 lb | $14–$18 / 5 lb | $12–$16 / 4 lb | ~$14 / 4 lb | $13–$16 / 4 lb | ~$11 / 4 lb | ~$7-9 (4 lb) | ~$12.85 (4 lb) | ~$12-16 (5 lb) | ~$8-10 (4 lb) | ~$18-26 (4 lb) | ~$19-22 (4 lb) | ~$10-14 (4 lb) | ~$8-12 (4 lb) | ~$9-13 (4 lb) | ~$12-15 (4 lb) |
| Our Take | The organic bloom formula. 6% phosphorus from natural sources — the... | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | **Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics. | — | — | — | — | — | — | — | — | — | — |
The Competition
Rose-tone Organic Fertilizer
by Espoma
4-3-2
N-P-K
Price$8–$9 / 4 lb; $12 / 8 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Flower-tone Blossom Booster
by Espoma
3-4-5
N-P-K
Price$8–$10 / 4 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Rose & Flower Mix
by Down To Earth
4-8-4
N-P-K
Price$14–$18 / 5 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Total Advantage Rose & Flower Fertilizer
by Dr. Earth
4-6-2
N-P-K
Price$12–$16 / 4 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Rose & Flower Granular Fertilizer
by Jobe's Organics
3-4-3
N-P-K
Price~$14 / 4 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Happy Frog Fruit & Flower Fertilizer
by FoxFarm
4-9-3
N-P-K
Price$13–$16 / 4 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Natural & Organic Rose + Bloom Granular Plant Food
by Burpee
4-6-4
N-P-K
Price~$11 / 4 lb
**Burpee Rose + Bloom (4-6-4) is the only exact NPK match.** FoxFarm Fruit & Flower (4-9-3) and DTE Rose & Flower (4-8-4) push even higher phosphorus. Espoma Rose-tone dominates sales volume but has significantly lower P and K than Wicked Organics.
Rose-Tone
by Espoma
4-3-2
N-P-K
Sizes4, 8, 18 lb
Price~$7-9 (4 lb)
IngredientsFeather meal, poultry manure, bone meal, alfalfa meal, greensand, sulfate of potash; Bio-tone
OrganicOIM Registered
Total Advantage Rose & Flower
by Dr. Earth
4-6-2
N-P-K
Sizes1, 4, 12, 25 lb
Price~$12.85 (4 lb)
IngredientsFish bone meal, bone meal, alfalfa meal, feather meal, potassium sulfate, kelp; TruBiotic + mycorrhizae
OrganicOMRI, CDFA, CCOF, NOP
Rose & Flower Mix
by Down To Earth
4-8-4
N-P-K
Sizes1, 5, 15, 25, 40, 50 lb
Price~$12-16 (5 lb)
IngredientsFish bone meal, blood meal, langbeinite, alfalfa meal, seabird guano, rock phosphate, kelp; humic acids
OrganicOMRI, CDFA
Rose & Flower Granular
by Jobe's Organics
3-4-3
N-P-K
Sizes4, 6, 16 lb
Price~$8-10 (4 lb)
IngredientsBone meal, feather meal, processed manure, sulfate of potash; Biozome
OrganicOMRI Listed
Happy Frog Rose Food
by FoxFarm
4-4-5
N-P-K
Sizes4 lb
Price~$18-26 (4 lb)
IngredientsAlfalfa meal, bat guano, kelp meal, bone meal, feather meal, humic acid; 20 species microbes
OrganicOMRI, CDFA
Happy Frog Fruit & Flower
by FoxFarm
4-9-3
N-P-K
Sizes4, 18 lb
Price~$19-22 (4 lb)
IngredientsFish bone meal, alfalfa, bone meal, sulfate of potash magnesia, feather meal, rock phosphate; mycorrhizae
OrganicOMRI, CDFA
Organic Rose + Bloom
by Burpee
4-6-4
N-P-K
Sizes4 lb
Price~$10-14 (4 lb)
IngredientsComposted turkey litter, plant nutrients; beneficial microbes
OrganicOMRI Listed
Rose & Flower Food
by True Organic
4-5-3
N-P-K
Sizes4, 12 lb
Price~$8-12 (4 lb)
IngredientsPoultry manure, seabird guano, fish bone meal, soybean meal, sulfate of potash, crab/shrimp shell
OrganicOMRI, CDFA
Rose & Flower Food
by E.B. Stone
5-6-3
N-P-K
Sizes4, 15 lb
Price~$9-13 (4 lb)
IngredientsBlood meal, feather meal, bone meal, chicken manure, bat guano, alfalfa, kelp, potassium sulfate; mycorrhizae
OrganicCDFA
Flower Girl Bud & Bloom Booster
by Dr. Earth
3-9-4
N-P-K
Sizes1, 4, 12, 25 lb
Price~$12-15 (4 lb)
IngredientsFish bone meal, alfalfa, feather meal, potassium sulfate, seabird guano, soft rock phosphate; TruBiotic
OrganicOMRI, CDFA, CCOF, NOP
6% Phosphorus — Highest Organic P Ratio
The highest phosphorus-to-nitrogen ratio in the organic blend line. 6% P from natural mineral phosphate and composted manure fuels flower bud formation and bloom production.
Rose & Flowering Shrub Ready
1 lb per 2 ft of crown diameter at the drip line. Simple per-shrub dosing for roses, hydrangeas, lilacs, azaleas, and all flowering shrubs.
Composted Chicken Manure Base
Composted poultry manure provides a complete spectrum of micro and macro nutrients beyond just NPK — trace minerals, humic compounds, and beneficial microbial diversity.
Biologically-Driven Slow Release
Nutrients release through microbial breakdown of organic matter. Steady feeding aligned to soil temperature and plant growth — no burn risk, no nutrient surge.
Common Questions
