Wicked Organics · Fertilizer Guide

Bone Meal

NPK 3-15-0OrganicOMRI Listed

Bone meal is one of the oldest and most trusted organic fertilizers in gardening, prized for its high phosphorus content and slow-release delivery. With an NPK of 3-15-0, bone meal is the go-to amendment for gardeners who want stronger roots, more abundant blooms, and healthier fruit production — all without synthetic chemicals. Made ...

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Guaranteed Analysis

Nutrient Breakdown

N · Nitrogen
3%

Provides a small amount of slow-release nitrogen (3%) to support early vegetative growth without overstimulating foliage.

P · Phosphorus
15%

Delivers 15% phosphorus for strong root development, abundant flowering, fruit set, and energy transfer within plant cells. Also supplies approximately 24% calcium for cell wall strength.

K · Potassium
0%

N/A — Bone meal contains no potassium. Pair with Greensand (0-0-3) or Sul-Po-Mag for complete nutrition.

Derived from: Steamed and finely ground bovine bones

Overview

What It Is

Bone meal fertilizer is made from dried animal bones — typically cattle bones — that have been steamed at high pressure to remove fats and pathogens, then ground into a fine powder. This process preserves the phosphorus and calcium naturally present in bone while making it safe and easy to apply.

As a slow-release fertilizer, bone meal feeds plants for 1-4 months as soil organisms break it down. It works best in soils with a pH below 7.0 — in alkaline soils, phosphorus becomes less available and bone meal's effectiveness drops significantly. Always test your soil before applying.

Bone meal has been a cornerstone of organic gardening for generations, particularly valued for planting bulbs, establishing transplants, and supporting fruiting crops that need strong root systems and consistent phosphorus throughout the growing season.
Crop Fit

Best For

BulbsTomatoesRoot VegetablesRosesFruit TreesPeppersGarlicStrawberries
Bone meal is the classic amendment for spring-flowering bulbs like tulips and daffodils, providing phosphorus and calcium right where roots develop. Tomatoes and peppers benefit from the calcium that prevents blossom end rot and the phosphorus that drives fruit production. Root vegetables such as carrots, onions, and garlic rely on phosphorus for tuber and root expansion. Roses and flowering perennials respond with increased bloom counts and more vibrant color.
Application Rates

How Much to Use

Garden & beds5-10 lbs per 100 sq ft
Lawn10-20 lbs per 1,000 sq ft
Trees & shrubs1 lb per 2 inches of trunk diameter, spread to drip line
Containers1-2 tbsp per gallon of soil
FrequencyOnce per growing season at planting time
Step by Step

How to Apply

1

Soil pH Check

Test soil pH to confirm it is below 7.0. Bone meal is ineffective in alkaline soils above pH 7.0.

2

Calculate Rate

Calculate how much bone meal you need based on garden area and soil test phosphorus deficit.

3

Garden Rate

For gardens, broadcast 5–10 lbs per 100 sq ft and mix into the top 3 inches of soil.

4

Transplant Rate

For transplants, add 1–2 tablespoons per planting hole mixed into backfill soil.

5

Water In

Water thoroughly after application to begin slow microbial breakdown and phosphorus release.

6

Reapply

Reapply once per growing season. Bone meal releases slowly and a single application typically lasts the season.

Always start with a soil test — bone meal only works effectively in acidic to neutral soils (pH below 7.0). In alkaline soils, the phosphorus becomes locked up. For new garden beds, broadcast evenly and work into the top 3 inches. For individual transplants, mix 1-2 tablespoons into the planting hole. For bulbs, place a small amount under each bulb at planting. Bone meal must be incorporated into the soil — surface application is far less effective and may attract animals.
Handling & Timing

Safety & Season

Safety & Storage

Bone meal is non-toxic but the fine powder can irritate eyes and lungs. Wear a dust mask and gloves during application. Store in a sealed container in a cool, dry location. Note: the scent may attract dogs, raccoons, or skunks — always mix thoroughly into soil and water in well after applying.

Seasonal Notes

Apply bone meal in early spring when preparing garden beds or at transplanting time. Fall is ideal for planting bulbs with bone meal worked into the planting hole. Bone meal breaks down faster in warm soils (above 50°F) with active microbial life. Avoid winter application when soils are frozen.

In Context

How It Compares

Bone meal vs. Rock Phosphate: Bone meal (3-15-0) releases phosphorus faster (1-4 months) and also supplies calcium and small amounts of nitrogen. Rock phosphate (0-12-0) releases over 3-5 years and is vegan-friendly. Bone meal vs. Triple Superphosphate: TSP (0-46-0) is synthetic and water-soluble for immediate availability, while bone meal is organic and slow-release. Use bone meal for sustained feeding; TSP for quick corrections.
Answers

Frequently Asked Questions

What is bone meal fertilizer?
Bone meal is a natural, organic fertilizer made from finely ground animal bones. It is one of the most widely used organic phosphorus sources, providing approximately 3% nitrogen and 15% phosphorus (P₂O₅) along with significant calcium. Bone meal promotes strong root development, flowering, and fruiting while building soil calcium levels. It breaks down slowly in soil, releasing phosphorus gradually over weeks to months as soil microbes and acids process the material. Old Cobblers Farm™ Wicked Organics Bone Meal is a premium-grade, OMRI-Listed organic phosphorus amendment for gardens, flower beds, and landscapes.
What is bone meal used for in the garden?
Bone meal is used to supply phosphorus and calcium to garden soil. Phosphorus is essential for root development, flower production, fruit set, and energy transfer within plants. Bone meal is especially popular at planting time for bulbs, transplants, roses, fruit trees, and perennials because it encourages rapid root establishment. The calcium content helps prevent disorders like blossom end rot in tomatoes. It is also used to build long-term phosphorus levels in soils that test low. Old Cobblers Farm™ Wicked Organics Bone Meal is a go-to organic amendment for bloom-boosting and root-building applications.
How do I use bone meal fertilizer?
Apply bone meal by mixing 2–5 pounds per 100 square feet into the top 4–6 inches of garden soil before planting. For individual planting holes, add 1–2 tablespoons and mix with backfill soil. For bulbs, sprinkle ½–1 teaspoon in each planting hole. For established plants, scratch 1–2 tablespoons into the soil surface around the base and water in. Phosphorus does not travel through soil easily, so incorporating bone meal into the root zone gives the best results. Old Cobblers Farm™ Wicked Organics Bone Meal is easy to measure and apply for precise organic phosphorus delivery.
Is bone meal good for tomatoes?
Yes, bone meal is excellent for tomatoes, particularly at transplanting time. The phosphorus promotes rapid root establishment, which helps tomato plants access water and nutrients more efficiently from the start. The calcium helps prevent blossom end rot, one of the most common tomato growing problems. Mix 1–2 tablespoons of bone meal into each planting hole when transplanting. For established plants, scratch a tablespoon into the soil surface around the base monthly during the growing season. Old Cobblers Farm™ Wicked Organics Bone Meal delivers the phosphorus and calcium tomatoes need for healthy roots and quality fruit.
What is the NPK of bone meal?
Bone meal has an approximate NPK ratio of 3-15-0, meaning it provides about 3% nitrogen, 15% phosphorus (P₂O₅), and no potassium. The high phosphorus content makes it one of the best organic sources for root development and flower production. The nitrogen component is minimal but contributes a small amount of slow-release feeding. Because bone meal contains no potassium, pair it with sulfate of potash or a balanced organic fertilizer for complete nutrition. Old Cobblers Farm™ Wicked Organics Bone Meal delivers concentrated organic phosphorus at 3-15-0.
Does bone meal attract animals to the garden?
Yes, bone meal can attract digging animals like raccoons, skunks, dogs, and squirrels, especially when applied on or near the soil surface. The animal proteins and fats in bone meal produce odors that attract wildlife. To minimize this issue, incorporate bone meal thoroughly into the soil rather than leaving it on the surface, and cover with mulch. Alternatively, consider using bone char, which undergoes high-temperature processing that removes most attracting odors. Old Cobblers Farm™ offers both Wicked Organics Bone Meal and Bone Char — the latter is a less animal-attractive phosphorus option.
Can I use bone meal for bulbs?
Yes, bone meal is one of the most traditional and effective amendments for spring-flowering bulbs. The phosphorus promotes strong root development during the fall planting period, which directly translates to larger, more vibrant blooms in spring. Sprinkle ½–1 teaspoon in each bulb planting hole, mix with soil, then set the bulb on top. For bed plantings, broadcast 2–3 pounds per 100 square feet before setting bulbs. Old Cobblers Farm™ Wicked Organics Bone Meal has been trusted by gardeners for generations to produce spectacular tulip, daffodil, crocus, and lily displays.

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