Comparison: Best Fish Fertilizer Calcium (Updated | Dec 1st)
But with so many options on the shelf, how do you know which one truly delivers? We’ve dug into the top contenders, testing for nutrient balance, ease of use, and real results in the soil. Whether you’re growing tomatoes, leafy greens, or blooming flowers, choosing the right blend matters. Let’s break down the **best fish fertilizer calcium** products so you can feed your garden with confidence—and see the difference.
Editor’s Choice
Best for a specific purpose
- Best for root boost: Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds
- Best for organic fish emulsion: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich emulsion: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for calcium-rich bone: Supply Solutions Pacific Bounty – Organic Fish Bone Meal Fertilizer 6-13-0 – Plus 14% Calcium for Plants Root Development- High Phosphorus Plant Food for Tomatoes
- Best for phosphorus power: Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds
- Best for seed & cell: Greenway Biotech
- Best for bloom-boost bone: Supply Solutions Pacific Bounty – Organic Fish Bone Meal Fertilizer 6-13-0 – Plus 14% Calcium for Plants Root Development- High Phosphorus Plant Food for Tomatoes
- Best for hydroponic calcium: Calcium Nitrate 15.5-0-0 Fertilizer – Made in USA – 5LB Greenhouse Grade Plant Food for Hydroponics
- Best for solution-grade calcium: Down To Earth All Natural Fertilizers Organic Solution Grade Calcium 96 – Professional Grade Limestone Powder 325 mesh for Liquid
- Best for yield-boost bone: Greenway Biotech
Product Comparison: Best Fish Fertilizer Calcium
Root Boost
Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds, Bulbs, Blooms, Flower Beds 4-12-0, 5 lb
Down To Earth All Natural Fertilizers
- Water-Soluble Formula – Easily dissolves in water for quick absorption and efficient nutrient delivery directly to the root zone
- Targets Root Development – Formulated to enhance root growth, improving plant stability, nutrient uptake, and drought resistance
- Fast-Acting Nutrients – Provides immediate access to essential nutrients like nitrogen, phosphorus, and potassium where roots need them most.
- Ideal for Transplants & Seedlings – Great for jumpstarting young plants or helping transplants establish quickly in new soil.
- Improves Soil-Root Interaction – Encourages a healthy rhizosphere, boosting microbial activity and root-zone nutrient cycling.
Organic Fish Emulsion
Alaska Fish Fertilizer OMRI Listed 5-1-1, 115 oz
Alaska
- Fish-based fertilizer for use in vegetable, fruit, and flower gardens
- Excellent for use on flowers, trees, and other plants
- OMRI listed
- For organic gardening
- Great for all indoor and outdoor plants
- NPK 5-1-1 fish emulsion fertilizer
- Fish has been used as a natural source of plant nutrients for centuries
- Easy to use, just mix with water
Vitamin-Rich Emulsion
CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer, 1 Quart
Lilly Miller
- Promotes healthy plant growth with 11 vitamins
- Can be used on all indoor and outdoor plants
- 100-percent organic
- Stimulates microorganisms
- Does not burn
Calcium-Rich Bone
Supply Solutions Pacific Bounty – Organic Fish Bone Meal Fertilizer 6-13-0 – Plus 14% Calcium for Plants Root Development- High Phosphorus Plant Food for Tomatoes, Bulbs, Veggies (5lbs)
Supply Solutions
- Supports Strong Roots and Bigger Blooms: With a balanced 6-13-0 formula, this bone meal fertilizer delivers nutrients that encourage deep root development and more vibrant flowers. The high phosphorus content promotes strong cell formation, and a fuller harvest of fruits and vegetables.
- Rich in Calcium to Prevent Blossom-End Rot: With 14% calcium, this helps strengthen plant tissue and reduce issues like blossom-end rot in tomatoes, peppers, and squash. Calcium also supports overall plant vigor, leading to more resilient crops.
- Ideal for Bulbs, Vegetables, and Flowering Plants: Whether you’re planting tulips in the fall, nourishing tomatoes in summer, or enriching flower beds, this is versatile enough for any garden setting. It works well for root and bulb crops.
- Organic, and with Natural Ingredients: Made from organic bone meal with added calcium to suppress odor, this is free from synthetic chemicals and GMOs. It’s a clean, sustainable choice for gardeners who want effective results without compromising the health of their soil or plants.
- Long-Lasting, Slow-Release Feeding: This breaks down gradually, releasing nitrogen (6%), phosphorus, and calcium over time. It feeds plants gently and steadily throughout the growing season—no burning, no overfeeding, and no constant reapplication needed.
Phosphorus Power
Down To Earth All Natural Fertilizers Organic Fish Bone Meal – High Phosphorus Plant Food for Buds, Bulbs, Blooms, Flower Beds 4-12-0, 1 lb
Down To Earth All Natural Fertilizers
- High Phosphorus Content (4-12-0): Boosts root growth, flower formation, and fruit set.
- Natural Source of Calcium: Strengthens plant cell walls and helps prevent blossom-end rot.
- Organic & OMRI Listed: Approved for certified organic gardening and farming.
- Gentle, Slow-Release Formula: Feeds steadily without burning plants.
- Ideal for Blooming & Rooting Crops: Perfect for flowers, bulbs, tomatoes, peppers, and root vegetables.
Seed & Cell
Greenway Biotech, Inc. Organic Fish Bone Meal Fertilizer 4-17-0 for Home Gardening – Good Source of Calcium and Potassium Promote Roots Growth – Ideal for Flowering Plant, Trees and Shrubs (2 Pounds)
Greenway Biotech, Inc.
- FISH BONE MEAL 4-17-0 FORMULA – Greenway Biotech fertilizer with 4-17-0 formula is exactly what you need for the best fertilizer that will give you high yield. Fish plant fertilizer enhances soil microbial life, promotes vigorous root development & provides an early season boost for all of your plants.
- GOOD SOURCE OF PHOSPHORUS – Fish meal fertilizer is a good source of calcium and phosphorus, it helps plants take to new soil by boosting root development. Strong root development means plants will grow faster and be healthier because they can absorb more water and nutrients from the soil.
- ORGANIC NUTRIENTS BLEND – Fish Bone Meal is a marine-based alternative to traditional terrestrial bone meal options for all types of plants, trees and vegetables. Carefully blended from organic nutrients in the ideal proportions without the use of synthetics, growth stimulants or low quality fillers.
- IDEAL FOR SEED & CELL FORMATION – While phosphorus is mostly associated with flower growth, the nitrogen and potassium alongside other micronutrients are all vital for cell and seed growth. The nitrogen in Fish Bone Meal 4-17-0 is a significant element in the amino acid composition.
- SLOW RELEASE FERTILIZER – Fish meals’ organic matter feeds the micro-organisms in the soil and maintains the bio-fertility of the soil. Plants find our fish emulsion fertilizer easy to absorb and uptake. As it slow-releases the nutrients for months at a time, Our fish meal is cost-effective as well.
Bloom-Boost Bone
Supply Solutions Pacific Bounty – Organic Fish Bone Meal Fertilizer 6-13-0 – Plus 14% Calcium for Plants Root Development- High Phosphorus Plant Food for Tomatoes, Bulbs, Veggies (20lbs)
Supply Solutions
- Supports Strong Roots and Bigger Blooms: With a balanced 6-13-0 formula, this bone meal fertilizer delivers nutrients that encourage deep root development and more vibrant flowers. The high phosphorus content promotes strong cell formation, and a fuller harvest of fruits and vegetables.
- Rich in Calcium to Prevent Blossom-End Rot: With 14% calcium, this helps strengthen plant tissue and reduce issues like blossom-end rot in tomatoes, peppers, and squash. Calcium also supports overall plant vigor, leading to more resilient crops.
- Ideal for Bulbs, Vegetables, and Flowering Plants: Whether you’re planting tulips in the fall, nourishing tomatoes in summer, or enriching flower beds, this is versatile enough for any garden setting. It works well for root and bulb crops.
- Organic, and with Natural Ingredients: Made from organic bone meal with added calcium to suppress odor, this is free from synthetic chemicals and GMOs. It’s a clean, sustainable choice for gardeners who want effective results without compromising the health of their soil or plants.
- Long-Lasting, Slow-Release Feeding: This breaks down gradually, releasing nitrogen (6%), phosphorus, and calcium over time. It feeds plants gently and steadily throughout the growing season—no burning, no overfeeding, and no constant reapplication needed.
Hydroponic Calcium
Calcium Nitrate 15.5-0-0 Fertilizer – Made in USA – 5LB Greenhouse Grade Plant Food for Hydroponics, Plants & Gardens – Fruit, Vegetables. Blossom End Rot Tomatoes
Cz Garden Supply
- PREMIUM QUALITY INGREDIENTS – Cz Garden Calcium Nitrate 15.5-0-0 is a water soluble, high purity, premium Nitrogen + Calcium fertilizer designed to boost the healthy development of all your indoor flowers, lawn, and garden vegetables.
- 100% WATER SOLUBLE – GREENHOUSE GRADE – High Purity, Premium Quality fertilizer. Beware of lower grade Agricultural Grade Calcium Nitrate that leaves oily skim on your solution, irrigation equipment, and plant roots.
- 19% CALCIUM + 15.5% NITROGEN FERTILIZER promotes green leafy growth and hardy plants. Get lush vegetation in your home garden with our high-efficiency Calcium Nitrate Fertilizer
- 321 FEEDING SCHEDULE – Perfect for Hydroponics, Drip Irrigation Flood & Drain, NFT, DWC, Soil, Coco, Earthbox, Tower Gardens, etc.
- RESEALABLE, EASY POUR PACKAGING: Cz Garden Calcium Nitrate 15.5-0-0 fertilizer comes sealed in a 5LB, heavy duty resealable pouch. Pour the necessary quantity with ease and store the rest for future use.
- COUNTRY OF ORIGIN: USA – Cz Garden fertilizers and soil amendments are manufactured in the USA from the highest quality ingredients. Buy with confidence!
- Cz Garden Organics is committed to developing Premium Grade custom soil amendment blends, fertilizers, and nutrients for your organic garden. Ya Dig? Germinate. Propagate. Cultivate.
Solution-Grade Calcium
Down To Earth All Natural Fertilizers Organic Solution Grade Calcium 96 – Professional Grade Limestone Powder 325 mesh for Liquid, Drip or Spray Applications, 1 lb
Down To Earth All Natural Fertilizers
- High-Calcium Formula (96% CaCO₃): Delivers a concentrated source of calcium to prevent deficiency and support healthy plant growth.
- Solution Grade & Water-Soluble: Ultra-fine powder dissolves easily in water for foliar or soil applications.
- OMRI Listed for Organic Use: Approved for use in certified organic farming and gardening.
- Supports Fruit Quality & Cell Structure: Helps prevent blossom-end rot and promotes firm, healthy produce.
- Versatile Application: Suitable for drip systems, hydroponics, foliar feeding, or soil drenches.
Yield-Boost Bone
Greenway Biotech, Inc. Organic Fish Bone Meal Fertilizer 4-17-0 for Home Gardening – Good Source of Calcium and Potassium Promote Roots Growth – Ideal for Flowering Plant, Trees and Shrubs- 10 Pounds
Greenway Biotech, Inc.
- FISH BONE MEAL 4-17-0 FORMULA – Greenway Biotech fertilizer with 4-17-0 formula is exactly what you need for the best fertilizer that will give you high yield. Fish plant fertilizer enhances soil microbial life, promotes vigorous root development & provides an early season boost for all of your plants.
- GOOD SOURCE OF PHOSPHORUS – Fish meal fertilizer is a good source of calcium and phosphorus, it helps plants take to new soil by boosting root development. Strong root development means plants will grow faster and be healthier because they can absorb more water and nutrients from the soil.
- ORGANIC NUTRIENTS BLEND – Fish Bone Meal is a marine-based alternative to traditional terrestrial bone meal options for all types of plants, trees and vegetables. Carefully blended from organic nutrients in the ideal proportions without the use of synthetics, growth stimulants or low quality fillers.
- IDEAL FOR SEED & CELL FORMATION – While phosphorus is mostly associated with flower growth, the nitrogen and potassium alongside other micronutrients are all vital for cell and seed growth. The nitrogen in Fish Bone Meal 4-17-0 is a significant element in the amino acid composition.
- SLOW RELEASE FERTILIZER – Fish meals’ organic matter feeds the micro-organisms in the soil and maintains the bio-fertility of the soil. Plants find our fish emulsion fertilizer easy to absorb and uptake. As it slow-releases the nutrients for months at a time, Our fish meal is cost-effective as well.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Buying Guide
FAQs
What should I look for when choosing a fish‑based fertilizer for calcium needs?
Check the N‑P‑K ratio and specifically the calcium percentage; a higher calcium content (e.g., 14% Ca in bone meals) helps prevent blossom‑end rot. Also verify that the product is OMRI‑listed if you garden organically, and consider whether you need a water‑soluble formula for quick foliar feeding or a slow‑release bone meal for long‑term soil enrichment.
How does a water‑soluble fish fertilizer compare to a bone‑meal based one?
Water‑soluble options, like Down To Earth’s fish bone meal solution, dissolve instantly and deliver nutrients directly to the root zone, which is great for quick boosts and hydroponic systems. Bone‑meal products, such as Supply Solutions Pacific Bounty, release nutrients slowly over weeks, providing steady calcium and phosphorus for sustained root development and reduced risk of burning.
Which product offers the highest calcium concentration for preventing blossom‑end rot?
Supply Solutions Pacific Bounty’s 6‑13‑0 bone meal lists 14% calcium, making it the richest calcium source among the listed items. The Down To Earth Calcium solution (96% CaCO₃) also provides a high calcium dose, but it’s a pure calcium supplement rather than a balanced fertilizer.
Are there any differences in organic certification I should be aware of?
All the fish‑based fertilizers in the list are OMRI‑listed, meaning they meet organic standards, but some, like Alaska Fish Fertilizer, explicitly market themselves for indoor and outdoor organic gardening. Products such as the Central Garden Brands Fish Emulsion also emphasize a 100‑percent organic composition without synthetic additives.
What are the advantages of a high‑phosphorus fish fertilizer for blooming plants?
High phosphorus ratios (e.g., 4‑12‑0 or 4‑17‑0) stimulate flower and fruit set by encouraging strong root systems and cell division. Greenway Biotech’s 4‑17‑0 formula combines this with a good nitrogen level, supporting both vegetative growth and prolific blooming.
Which fertilizer is best for hydroponic or drip‑irrigation systems?
Cz Garden Calcium Nitrate (15.5‑0‑0) is fully water‑soluble and designed for greenhouse‑grade hydroponic applications, delivering both calcium and nitrogen efficiently. The Down To Earth Calcium solution also dissolves easily and can be used in drip lines for precise nutrient dosing.
How do price and value compare across these fish fertilizers?
While exact prices aren’t listed, products that combine high calcium with a balanced N‑P‑K ratio, like Supply Solutions Pacific Bounty, often provide better value because a single application supplies multiple nutrients. Pure calcium supplements, such as the 96% CaCO₃ powder, may be cheaper per pound of calcium but lack the additional nitrogen and phosphorus that many gardeners need.