Wicked Organics Organic Organic OMRI Listed

4-6-4 Fertilizer – Strong Flowers

NPK 4-6-4

4-6-4 Organic Fertilizer for Strong Flowers is a natural fertilizer blended from mineral and organic ingredients, specially formulated to support maximum bloom production in flowering perennials, annuals, and ornamental shrubs. With the highest phosphorus content in the Wicked Organics lineup (6%), this formula drives the prolific flower bud formation, strong root development, and vibrant bloom color that flowering plants demand. The 4% nitrogen split between water-soluble and water-insoluble forms provides both immediate feeding and slow-release nutrition through microbial activity, fueling hardy growth and rich leaf color without excessive vegetative push that diverts energy from blooming. The natural ingredients — including elemental sulfur, bone char, and protein meals — provide not only major and minor nutrients but also help maintain proper soil pH, feeding beneficial organisms that increase the soil's nutrient exchange capacity. Spring applications help plants form strong branches, greater leaf surface for photosynthesis, and more buds that develop into healthy blossoms. Fall applications promote greater root systems and winter hardiness, with slow-release nutrients remaining through winter to become available when plants wake up in early spring. Old Cobblers Farm™ Wicked Organics 4-6-4 is OMRI Listed and crafted for gardeners who want stronger, more abundant flowers grown the natural way.

Application Rates FAQs
Nutrient Profile
WO-4-6-4
4–6–4
4-6-4 Fertilizer – Strong Flowers
Derived From
  • Elemental Sulfur, Animal Protein Meals, Vegetable Protein Meals, Natural Sulfate of Potash, Natural Nitrate of Soda, Bone Char
4-6-4
NPK Ratio
Organic
Formula Type
Twice per year — spring (when foliage begins to grow) and fall (after flowering). If only one application per year is practical, fall is preferred.
Feeding Frequency
—
Compatible Plants
What It Is

Understanding 4-6-4

Wicked Organics 4-6-4 is a premium organic fertilizer formulated from six natural ingredients — Elemental Sulfur, Animal Protein Meals, Vegetable Protein Meals, Natural Sulfate of Potash, Natural Nitrate of Soda, and Bone Char — to deliver the high-phosphorus nutrition that flowering plants need for maximum bloom production.

The guaranteed analysis breaks down to 4.0% Total Nitrogen (1.5% Water Soluble, 2.5% Water Insoluble), 6.0% Available Phosphate (P2O5), and 4.0% Soluble Potash (K2O). The water-insoluble nitrogen fraction releases slowly through microbial activity, providing sustained nutrition that feeds plants for weeks after application rather than delivering a single burst.

This is the same proven Pro-Holly formula used in the Wicked Organics Blueberry, Evergreen, and Citrus fertilizers — but marketed specifically for flowering plants where the high phosphorus content drives bloom production rather than acid-soil management. The elemental sulfur component provides soil-acidifying benefits as a bonus, making this formula also suitable for acid-loving flowering plants like azaleas, rhododendrons, and hydrangeas.

N
Nitrogen — 4%

4.0% Total Nitrogen (1.5% Water Soluble, 2.5% Water Insoluble) — provides both immediate and slow-release nitrogen for sustained growth and flower production without overstimulating foliage at the expense of blooms.

P
Phosphorus — 6%

6.0% Available Phosphate (P2O5) — the highest phosphorus level in the Wicked Organics line, driving prolific flower bud formation, strong root systems, and abundant bloom production.

K
Potassium — 4%

4.0% Soluble Potash (K2O) — enhances bloom color and longevity, strengthens stems, improves disease resistance, and supports winter hardiness in perennial flowering plants.

Recommended Plants

Best For

Roses
Peonies
Hydrangeas
Azaleas
Rhododendrons
Flowering Perennials
Annual Flowers
Flowering Shrubs

Growing Detail

Roses respond dramatically to the 6% phosphorus with more abundant, larger blooms and stronger cane growth. Peonies depend on phosphorus for the massive flower production they are prized for. Hydrangeas benefit from both the phosphorus for blooming and the sulfur for the acidic conditions that produce blue flowers. Azaleas and rhododendrons are acid-loving plants that thrive on this formula's natural ingredients that maintain proper soil pH while delivering complete nutrition. Flowering perennials like daylilies, irises, and coneflowers develop stronger crowns and more reliable bloom cycles. Annual flowers including petunias, marigolds, and zinnias produce more prolific blooms throughout the season. Flowering shrubs such as lilacs, forsythia, and butterfly bush respond with denser flower clusters.
Dosing Guide

Application Rates

Garden Beds
1 lb per 2 feet of crown diameter for shrubs and perennials; 2-3 lbs per 100 sq ft for flower beds
Container / Pot
1-2 tbsp per gallon of soil
Water Mix
N/A — granular application
Lawn
N/A — formulated for flowering plants, not turf. Use 5-3-4 or 4-3-3 for lawns.
Trees
1 lb per 2 feet of crown diameter, broadcast under the drip line
Per Acre
870-1,300 lbs per acre
Frequency
Every 2-4 weeks

How to Apply

Seasonal Notes

Spring: Apply when foliage begins to grow to support new branch growth, leaf surface area, and bud development. Summer: Not typically needed — spring and fall applications cover the growing season. Fall: Most important application. Root systems are most active after a full season of photosynthesis. Slow-release nutrients applied in fall remain through winter and become available in early spring when plants first emerge. Winter: Do not apply to frozen ground.
How It Compares

Side by Side

The 4-6-4 delivers 50% more phosphorus than the balanced 5-3-4 and 4-3-3 formulas, making it the best choice specifically for flowering plants where bloom production is the priority. Compared to synthetic bloom boosters like 15-30-15, it delivers lower immediate nutrient concentration but feeds the soil ecosystem for longer-lasting results and eliminates burn risk. This is the same formulation as the Wicked Organics Blueberry, Evergreen, and Citrus fertilizers — all based on the proven Pro-Holly recipe — but positioned for general flowering plant use.

Safety & Storage

Store in a dry environment. Natural product with no known hazards. Wear a dust mask if sensitive to fine particles. Wear gloves if skin sensitivities appear. Eye protection optional. Wash hands after use.

Got Questions?

Frequently Asked

  • The best organic flower fertilizer provides elevated phosphorus to drive bloom production, balanced nitrogen for healthy foliage, and potassium for flower longevity and disease resistance. A 4-6-4 ratio is ideal because the higher phosphorus (6%) directly fuels flower bud formation and root strength, while the balanced nitrogen and potassium support overall plant vigor. The organic ingredients release slowly for sustained feeding throughout the blooming season. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer is specifically formulated for organic flower gardens, delivering bigger, more vibrant blooms from natural ingredients.
  • Yes, organic 4-6-4 is an excellent choice for roses grown in organic gardens. The elevated phosphorus supports abundant bloom production, while nitrogen maintains healthy canes and foliage and potassium improves disease resistance and flower color. Apply in early spring, after the first bloom flush, and in mid-summer for repeat-blooming varieties. The slow-release organic ingredients reduce the risk of root burn that can occur with synthetic rose fertilizers. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer delivers the organic bloom-boosting nutrition roses need for a season full of beautiful flowers.
  • Organic 4-6-4 benefits virtually all flowering plants, including roses, dahlias, peonies, irises, daylilies, coneflowers, zinnias, marigolds, petunias, geraniums, lavender, and all types of annuals and perennials. The bloom-focused phosphorus level supports heavy-flowering species, while the balanced nitrogen and potassium provide complete plant nutrition. Both sun and shade flowering plants respond well to this ratio. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer is versatile enough for mixed flower borders, cutting gardens, container plantings, and dedicated rose beds.
  • For individual flowering plants, apply 1–2 tablespoons of organic 4-6-4 per plant depending on size. For flower beds, broadcast 3–5 pounds per 100 square feet and work into the top few inches of soil. For containers, add 1 tablespoon per gallon of soil at planting and top-dress monthly during the blooming season. For established roses, use ¼–½ cup per bush. Always water thoroughly after application. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer is gentle enough that slight over-application will not harm plants, making it forgiving for home gardeners.
  • Yes, 4-6-4 is an excellent organic option for spring-flowering bulbs. The elevated phosphorus promotes strong root development during fall planting, which directly translates to better blooms in spring. Mix into the soil at the bottom of the planting hole or broadcast over the bed before setting bulbs. For established bulb plantings, top-dress in fall to replenish nutrients for next year's flowers. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer provides a natural alternative to synthetic bulb fertilizers, feeding bulbs gently while improving the soil they grow in.
  • Wicked Organics 4-6-4 is formulated from vegetable protein meals, animal protein meals, bone char, and natural sulfate of potash. Bone char is the primary phosphorus source, providing plant-available phosphorus along with calcium for strong cell walls. The protein meals deliver slow-release nitrogen, and sulfate of potash provides chloride-free potassium. These OMRI-Listed ingredients feed plants steadily while building soil health through microbial activity. Old Cobblers Farm™ Wicked Organics 4-6-4 Fertilizer uses only high-quality natural ingredients for safe, effective organic flower nutrition.
  • Yes, organic 4-6-4 can be used on vegetable gardens, particularly for crops that benefit from higher phosphorus levels like tomatoes, peppers, squash, and root vegetables. However, for leafy greens and vegetables that need more nitrogen, the Wicked Organics 10-2-8 or 5-3-4 formulas may be better suited. 4-6-4 is most effective on vegetables during flowering and fruiting stages when phosphorus demand is highest. Old Cobblers Farm™ offers a range of organic formulas so you can match the NPK ratio to your specific crop needs throughout the growing season.

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