--- title: "Bone Meal Fertiliser: When and How to Use It" description: "Bone meal fertiliser: NPK profile, when to use it, application rates for bulbs, tomatoes, fruit trees, and the soil-test-first rule. Pet safety covered." image: https://growperma.com/hubfs/blog/images/gp-0107-bone-meal-fertilizer-hero.webp --- [Skip to content](https://growperma.com/blog/bone-meal-fertiliser-when-and-how-to-use-it#main-content) [![GrowPerma Logo](https://growperma.com/hs-fs/hubfs/icon-512.png?width=40&height=40&name=icon-512.png)](https://growperma.com/) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) ![A gardener sprinkling white bone meal fertilizer into a tomato planting hole next to a healthy young tomato seedling in a backyard garden](https://growperma.com/hs-fs/hubfs/blog/images/gp-0107-bone-meal-fertilizer-hero.webp?width=1200&height=520&name=gp-0107-bone-meal-fertilizer-hero.webp) In This Article Table of Contents ![Peter Vogel](https://growperma.com/hubfs/Peter%20Vogel%20Portait.png) Peter Vogel Peter Vogel is the founder of GrowPerma, bringing together evidence-based gardening advice with permaculture principles. When he's not writing about companion ... [Soil & Composting](https://growperma.com/blog/tag/soil-composting) May 11, 2026 # Bone Meal Fertiliser: When and How to Use It Some links below are affiliate links. If you buy through them we earn a commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. **How much bone meal per plant:** 1 to 2 tablespoons (15 to 30 ml) in each bulb or transplant hole, 1 to 2 cups (240 to 480 ml) per young fruit tree at planting, 5 to 10 lb per 100 sq ft (2.5 to 5 kg per 10 m²) raked into the top 3 inches (7.5 cm) of an established bed, and 1 to 2 tablespoons per cubic foot (28 litres) of potting mix. Mix it into the root zone every time. Surface-sprinkled bone meal mostly stays at the surface, because phosphorus binds where you put it instead of washing down to the roots. Apply at planting or autumn bed prep, never mid-season: the release runs 4 to 6 months. One check before you buy a bag. Bone meal only pays off where phosphorus is genuinely short, and most established home gardens are not. Years of compost and manure push soil phosphorus into the high range, and past roughly 30 to 50 ppm more phosphorus adds no yield while locking up zinc and iron. Soil-test first. It is a targeted amendment, not a general feed, and not a substitute for compost. 3-15-0 Typical NPK profile Penn State, Down to Earth 20-30% Calcium content By weight 4-6 mo Release window Slow release 5-10 lb Per 100 sq ft 2.5 to 5 kg per 10 m² Quick answer Bone meal is a slow-release phosphorus and calcium amendment, not a feed. It earns its place at planting time: bulbs, root crops, tomato and pepper transplants, fruit trees, and new beds on sandy or depleted soil. It does nothing on soil that already tests high in phosphorus, nothing for leafy growth, and nothing quickly. ## What bone meal actually is ![A paper bag of OMRI-listed organic bone meal fertilizer with a wooden tablespoon and a small soil cross-section showing roots reaching for the bone meal placement](https://growperma.com/hubfs/blog/images/gp-0107-bone-meal-bag-float.webp) Bone meal is exactly what it sounds like: animal bones (typically beef cattle) that have been steamed under pressure, dried, and ground into a fine powder. The steaming destroys pathogens and breaks down the bone structure so it can be ground finely; the powder is then sold in 3 to 50 lb (1.4 to 23 kg) bags as an organic soil amendment. [Epic Gardening](https://www.epicgardening.com/bone-meal/) and [Down to Earth's product specifications](https://downtoearthfertilizer.com/products/single-ingredients/bone-meal-3-15-0/) both confirm the typical NPK profile sits around 3-15-0, with 20 to 30 percent calcium by weight as a major secondary benefit. The release is slow. Microbes in the soil break down the bone particles over 4 to 6 months, gradually releasing phosphorus and calcium into plant-available form. That makes bone meal great for one-time placements at planting (where the plant will draw on it through the season) and bad for fast-fix nutrient deficiencies (where you need response in days, not months). Why this works (the permaculture angle) Bone meal is a closed-loop input in the broader sense: it's a slaughterhouse byproduct, so using it as fertilizer keeps an output of one system feeding another. That said, the deeper permaculture move is to ask whether you actually need to import phosphorus at all. A garden running on compost, [finished home compost](https://growperma.com/blog/composting-for-beginners-the-complete-guide), and on-site organic matter rarely runs low on phosphorus over time. Bone meal is a useful tool when you have specific needs, not a routine input. ## When bone meal is the right call ![Tulip and daffodil bulbs being planted in autumn with a tablespoon of bone meal sprinkled at the bottom of each hole](https://growperma.com/hubfs/blog/images/gp-0107-bulb-planting-body.webp) | Best uses for bone meal | What it delivers | Rate | | --- | --- | --- | | Spring bulb planting (tulips, daffodils, hyacinth, garlic) | Root and bulb development, sustained P through dormancy | 1 to 2 tablespoons per bulb hole | | Tomato and pepper transplants | Strong early root system, flowering and fruiting support | 1 to 2 tablespoons per planting hole | | [Fruit tree planting](https://growperma.com/blog/food-forest-guide-design-plant-and-grow-an-edible-ecosystem) | Long-term phosphorus and calcium release for tree establishment | 1 to 2 cups per young tree (½ to 1 cup for shrubs) | | Root crops (carrots, beets, parsnips, turnips) | Cell wall strength, calcium availability, sweetness | 5 to 10 lb per 100 sq ft worked into bed | | Rose bushes and flowering perennials | Bloom support, sustained flowering through season | ½ cup per established bush, top-dressed at base | | New raised bed prep on depleted or sandy soil | One-time phosphorus charge for first 2 to 3 seasons | 2.5 to 5 lb per 100 sq ft mixed into top 3 inches | Sources: [Cooperative Extension, bone meal amounts per plant and per 100 sq ft](https://ask.extension.org/kb/faq.php?id=899220); [Fertilome bone meal product label](https://www.fertilome.com/ProductFiles/2024/07/23/34120%20Bone%20Meal%2016%20lb%20032624%20RS%20label.pdf). ## When to skip bone meal, and the plants that do not want it Three of the four People Also Ask boxes on this query are about the downside, not the dose. Here is the short list. | Skip it when | Why | Use instead | | --- | --- | --- | | Acid-loving plants: blueberries, azaleas, rhododendrons, camellias, cranberries | Bone meal is 20 to 30 percent calcium and nudges pH upward; these plants want pH 4.5 to 5.5 | Elemental sulfur to hold pH down, compost, pine-bark mulch | | Leafy greens: lettuce, spinach, kale, chard | They are after nitrogen. Bone meal is roughly 3 percent N and no potassium | Blood meal, finished compost, diluted comfrey or nettle feed | | Soil already testing above about 50 ppm phosphorus | No yield response, and excess P locks up zinc, iron and manganese and runs off into waterways | Nothing. Extension guidance is to stop phosphorus inputs entirely on high-P soil | | Soil above pH 7 | Phosphorus availability falls sharply regardless of how much you add | Correct pH first, then re-test before amending | | A plant that looks hungry right now | Release takes 4 to 6 months. Mid-season bone meal arrives after the season | A fast feed now, bone meal at the next planting | | Beds a determined dog can reach | Bone meal smells like meat. Dug up and eaten it causes pancreatitis or a blockage | Rock phosphate or soft rock phosphate, no animal product | **Can you use too much bone meal?** It will not burn your plants, because the release is slow and microbial. The damage is slower than that: on soil that already tests high, extra phosphorus suppresses zinc, iron and manganese uptake and leaves by runoff. Double the table rate is wasted money and a water-quality problem, not a dead tomato. **Can you sprinkle bone meal on top of the soil?** Not usefully. Phosphorus binds to the soil particles it lands on and does not migrate down, so a surface dusting feeds nothing at root depth and is exactly what a dog digs up. For an established perennial, scratch it into the top inch (2.5 cm) and water it in. For anything you are planting, it goes in the hole. ## Soil-test first (the most-skipped step) ![A gardener collecting a soil sample from a vegetable bed with a small spade, with a soil test kit and labeled sample bags on a wooden bench](https://growperma.com/hubfs/blog/images/gp-0107-soil-test-body.webp) The single most common bone meal mistake is using it without checking whether the soil needs more phosphorus. [Michigan State University Extension](https://www.canr.msu.edu/news/no-payoff-from-high-soil-test-phosphorus-save-fertilizer-and-protect-water-quality) documents that many home gardens already test in the high-phosphorus range, often because of years of compost or manure additions. Beyond about 30 to 50 ppm soil phosphorus, adding more delivers no yield benefit and starts causing problems. The [Sustainable Market Farming summary](https://www.sustainablemarketfarming.com/2017/11/06/soil-tests-and-high-phosphorus-levels/) of extension soil-test guidance highlights two specific risks of excess phosphorus: it can lock up zinc, iron, and manganese (creating micronutrient deficiencies in your plants), and runoff can pollute waterways with downstream environmental effects. [University of Wisconsin Crops and Soils Extension](https://cropsandsoils.extension.wisc.edu/articles/how-to-lower-phosphorus-levels-in-wisconsin-crop-fields/) recommends eliminating phosphorus inputs entirely on soils that already test high. How to get a soil test: contact your local Cooperative Extension Service in the US (every state has one) or use a private lab. Cost: typically $15 to $40 per sample. Read the results before you buy bone meal. ## How to apply bone meal correctly 1 Mix into the root zone, not the surface Phosphorus does not move through soil the way nitrogen does. It binds quickly to soil particles and stays roughly where you placed it. That means surface-applied bone meal mostly sits at the top of the soil and never reaches the roots. Always mix it into the planting hole or work it into the top 3 inches (7.5 cm) of soil where the roots will grow. In an established no-dig bed the job is getting the powder down into that zone without turning the profile over: a broadfork lifts and loosens so you can rake it in, where a tiller or a spade would invert everything you have built. Which [broadfork suits your bed width](https://growperma.com/blog/best-broadfork-picks-by-garden-size) comes down to tine spread and how heavy your soil is. 2 Apply at planting, not mid-season Because bone meal takes 4 to 6 months to release, applying it mid-season means the plant won't see the phosphorus until the season is nearly over. The right moment is at transplanting, planting, or autumn bed prep. For perennials, top-dress in early spring and scratch lightly into the surface. 3 Water thoroughly after application Watering activates the microbial breakdown process and starts moving calcium into solution. Even a slow-release product needs moisture to work. 4 Watch your soil pH Bone meal works best when soil pH sits between 6.0 and 7.0. Above pH 7, phosphorus availability drops sharply regardless of how much you add. If your soil is alkaline, look into [adjusting soil pH](https://growperma.com/blog/soil-ph-guide-why-it-matters-and-how-to-fix-it) before relying on bone meal as your phosphorus source. ## Which bone meal to buy Bone meal is close to a commodity, so the only things worth comparing are the NPK ratio and whether it is steamed. Two that do the job: **Down To Earth Fish Bone Meal (4-12-0).** Higher phosphorus than most, OMRI listed, and the fish variant breaks down a little faster than the bovine kind. This is the one to pick if you are amending a bed you plan to plant into within a few weeks. [Check Down To Earth Fish Bone Meal on Amazon](https://www.amazon.com/dp/B0FP3XN2TB?tag=growperma-soil-20)Paid link **Earth Science Natural Bone Meal (4 lb).** The straightforward option for bulbs and transplanting. Cheaper per pound and easier to find, though the phosphorus is lower, so you will use a bit more of it. [Check Earth Science Bone Meal on Amazon](https://www.amazon.com/dp/B0D99KRKL9?tag=growperma-soil-20)Paid link If your soil test came back with adequate phosphorus, skip both. Adding more will not help your plants and the excess runs off into waterways. ## Bone meal vs blood meal vs fish meal ![Side-by-side infographic comparing bone meal blood meal and fish meal organic fertilizers by NPK profile and release speed](https://growperma.com/hubfs/blog/images/gp-0107-fertilizer-comparison-infographic.webp) These three slaughterhouse-byproduct fertilizers solve different problems and work well together when you actually need a full NPK boost: | Amendment | Typical NPK | Best for | Release | | --- | --- | --- | --- | | Bone meal | 3-15-0 | Bulbs, flowering, root crops, transplants | Slow (4-6 mo) | | Blood meal | 12-0-0 | Leafy greens, nitrogen-hungry plants | Fast (2-4 weeks) | | Fish meal / fish bone meal | ~9-5-1 / 4-12-0 | Balanced feeds, transplant shock | Moderate (1-3 mo) | Sources: synthesised from [HH Fertilizer organic NPK guide](https://www.hhfertilizer.com/news/organic-10-10-10-fertilizerbalanced-npk-for-healthy-plants-14610.html) and [Epic Gardening's bone meal review](https://www.epicgardening.com/bone-meal/). ## The pet warning every gardener needs to know ![A curious dog approaching a bone meal-amended garden bed with a red warning marker reminding gardeners to keep bone meal away from pets](https://growperma.com/hubfs/blog/images/gp-0107-pet-safety-float.webp) Keep bone meal away from dogs and cats Dogs (and to a lesser extent cats) find bone meal irresistible. The smell is essentially "meat" to them. A dog that digs up freshly applied bone meal and eats it can develop pancreatitis, gastrointestinal blockage, or vomiting that requires veterinary attention. Always: store sealed bags out of pet reach, mix bone meal deep into the soil so it cannot be dug up, supervise pets in newly fertilized beds for the first 48 hours, and consider plant-based phosphorus alternatives ([rock phosphate](https://growperma.com/blog/azomite-vs-rock-phosphate-mineral-amendments-compared) or soft rock phosphate) if you have determined diggers in the household. For most gardens with well-trained pets and properly buried applications, bone meal is fine. For multi-dog households where supervision is limited, the risk-management call is to use a plant-based phosphorus source instead. ## What about OMRI and organic certification? OMRI (Organic Materials Review Institute) maintains the standard list of inputs approved for certified organic production. [OMRI Listed bone meal](https://www.leedstone.com/understanding-omri-article/) products meet the USDA National Organic Program standards and are safe for use in certified organic gardens. If you grow for yourself, this matters less, but it's a clean way to verify the product is what it claims to be and free of contaminants. Look for the OMRI seal on the bag. Get the Weekly Dig One practical permaculture guide a week, written for gardeners who do this on weekends: building living soil without buying it in bags. Free, no spam, unsubscribe any time. [Join the Weekly Dig](https://growperma.com/newsletter) [Browse All Guides →](https://growperma.com/blog) ## Frequently asked questions **What plants like bone meal?** Bulbs (tulips, daffodils, hyacinths, garlic), root crops (carrots, beets, parsnips, turnips), tomatoes and peppers at transplant, fruit trees at planting, roses, and flowering perennials. The plants that respond most to bone meal are the ones that prioritize root growth, flower production, or fruit set. **Is bone meal good for tomatoes?** Yes, especially at transplanting. Add 1 to 2 tablespoons of bone meal to each planting hole, mix into the soil, then plant. The phosphorus supports root establishment and early fruit set. Calcium content also helps prevent [blossom-end rot](https://growperma.com/blog/calcium-in-the-garden-more-than-just-ph) in soils with marginal calcium availability. After transplanting, switch to a balanced or nitrogen-leaning feed for the rest of the season; [worm castings](https://growperma.com/blog/worm-castings-natural-fertilizer) are a soft option that pairs well with bone meal. **How much bone meal do I add per plant?** Bulbs and transplants: 1 to 2 tablespoons (15 to 30 ml) per planting hole. Fruit trees: 1 to 2 cups (240 to 480 ml) per young tree at planting. Broadcast in established beds: 5 to 10 lb per 100 sq ft (2.5 to 5 kg per 10 m²) worked into the top 3 inches (7.5 cm). For potted plants: 1 to 2 tablespoons per cubic foot of potting mix, well mixed. **What is bone meal made of?** Steamed, dried, and ground animal bones (typically beef cattle). The steaming destroys pathogens and breaks down the bone structure for fine grinding. The resulting powder is roughly 3 to 4 percent nitrogen, 15 to 20 percent phosphorus, and 20 to 30 percent calcium by weight, with trace amounts of other minerals. **Can bone meal burn plants?** No, because of its slow-release profile. Unlike concentrated synthetic phosphorus fertilizers, bone meal releases nutrients over months as microbes process the bone particles. You would have to apply 10 to 20 times the recommended rate to cause direct fertilizer burn, which is impractical. **How to apply bone meal to potted plants?** Mix 1 to 2 tablespoons (15 to 30 ml) into each cubic foot of potting mix before planting. For established potted plants, gently scratch the same amount into the top inch (2.5 cm) of soil around the stem at the start of the growing season, then water in. Avoid surface-only application; phosphorus does not migrate downward through potting media. **Is there a vegan or plant-based alternative?** Yes. Soft rock phosphate (colloidal phosphate) and rock phosphate are mined mineral sources of phosphorus that work similarly to bone meal but contain no animal products. They are slower-release than bone meal but otherwise comparable. Look for OMRI-listed versions. ## Resources - [Epic Gardening, Using Bone Meal as Fertilizer: The Pros and Cons](https://www.epicgardening.com/bone-meal/) - [Grow Organic, Bone Meal for Plants: What It Does & How Much to Use](https://www.groworganic.com/blogs/articles/how-to-use-fertilizers-bone-meal) - [Down to Earth Fertilizer, Bone Meal 3-15-0 product page](https://downtoearthfertilizer.com/products/single-ingredients/bone-meal-3-15-0/) - [Fertilome, Bone Meal product label (PDF)](https://www.fertilome.com/ProductFiles/2024/07/23/34120%20Bone%20Meal%2016%20lb%20032624%20RS%20label.pdf) - [Cooperative Extension, Bone meal amounts](https://ask.extension.org/kb/faq.php?id=899220) - [Michigan State University Extension, No payoff from high soil test phosphorus](https://www.canr.msu.edu/news/no-payoff-from-high-soil-test-phosphorus-save-fertilizer-and-protect-water-quality) - [Sustainable Market Farming, Soil tests and high phosphorus levels](https://www.sustainablemarketfarming.com/2017/11/06/soil-tests-and-high-phosphorus-levels/) - [University of Wisconsin Crops and Soils Extension, Lowering phosphorus levels](https://cropsandsoils.extension.wisc.edu/articles/how-to-lower-phosphorus-levels-in-wisconsin-crop-fields/) - [Ohio State Extension, Developing P and K recommendations](https://ohioline.osu.edu/factsheet/agf-0515) - [OMRI Listed vs OMRI Certified explained](https://www.leedstone.com/understanding-omri-article/) **Tags:** [Soil & Composting](https://growperma.com/blog/tag/soil-composting) ## Related Articles ![Colored-pencil illustration of three backyard compost bins: a mesh ring, an enclosed bin, and a tumbler](https://growperma.com/hs-fs/hubfs/blog/images/gp-compost-bin-hero.webp?width=400&height=220&name=gp-compost-bin-hero.webp) 15 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Best Outdoor Compost Bin: Picks by Yard Size Peter Vogel ![Water from a watering can beading and running off cracked dry garden soil instead of soaking in, beside a wilting pepper plant](https://growperma.com/hs-fs/hubfs/blog/images/gp-0549-hero-water-runoff-20260908-070106.webp?width=400&height=220&name=gp-0549-hero-water-runoff-20260908-070106.webp) 8 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Hydrophobic Soil: Why Water Runs Off and How to Fix It Peter Vogel ![Late winter homestead pasture at dawn with frost-heaved ground, scattered clover seed and a broadcast spreader ready for frost seeding](https://growperma.com/hs-fs/hubfs/blog/images/gp-0546-hero-frost-seeding-clover-20260908-061142.webp?width=400&height=220&name=gp-0546-hero-frost-seeding-clover-20260908-061142.webp) 8 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Frost Seeding Clover: Let Winter Plant It for You Peter Vogel ![GrowPerma](https://growperma.com/hubfs/icon-512.png) Gardens That Work Like Forests — the smart-friend guide to permaculture for normal backyards. #### Explore - [Blog](https://growperma.com/blog) - [Companion Planting](https://growperma.com/blog/tag/companion-planting) - [Soil & Composting](https://growperma.com/blog/tag/soil-composting) - [Food Forests](https://growperma.com/blog/tag/food-forest) - [Permaculture](https://growperma.com/blog/tag/permaculture-foundations) #### Resources - [About](https://growperma.com/about) - [All Articles](https://growperma.com/blog) #### Legal - [Imprint](https://growperma.com/imprint) - [Privacy Policy](https://growperma.com/privacy-policy) - [Affiliate Disclosure](https://growperma.com/affiliate-disclosure) - Cookie Settings As an Amazon Associate I earn from qualifying purchases. 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The plants that respond most to bone meal are the ones that prioritize root growth, flower production, or fruit set." }, "name" : "What plants like bone meal?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Yes, especially at transplanting. Add 1 to 2 tablespoons of bone meal to each planting hole, mix into the soil, then plant. The phosphorus supports root establishment and early fruit set, and calcium content also helps prevent blossom-end rot in soils with marginal calcium availability. After transplanting, switch to a balanced or nitrogen-leaning feed for the rest of the season." }, "name" : "Is bone meal good for tomatoes?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Bulbs and transplants: 1 to 2 tablespoons (15 to 30 ml) per planting hole. Fruit trees: 1 to 2 cups (240 to 480 ml) per young tree at planting. Broadcast in established beds: 5 to 10 lb per 100 sq ft (2.5 to 5 kg per 10 m²) worked into the top 3 inches (7.5 cm). For potted plants: 1 to 2 tablespoons per cubic foot of potting mix, well mixed." }, "name" : "How much bone meal do I add per plant?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Steamed, dried, and ground animal bones (typically beef cattle). The steaming destroys pathogens and breaks down the bone structure for fine grinding. The resulting powder is roughly 3 to 4 percent nitrogen, 15 to 20 percent phosphorus, and 20 to 30 percent calcium by weight, with trace amounts of other minerals." }, "name" : "What is bone meal made of?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "No, because of its slow-release profile. Unlike concentrated synthetic phosphorus fertilizers, bone meal releases nutrients over months as microbes process the bone particles. 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