Comparison: Best Fish Fertilizer For Flowers (Updated | Dec 1st)
If you’re looking to give your flowers a natural boost, fish fertilizer might just be your garden’s new best friend. But with so many options out there, how do you know which one’s right for your garden? In this article, we’ll compare the top fish fertilizers to help you choose the best one for healthier, more beautiful flowers—all while keeping your soil happy and thriving.
- Best for omri certified 5-1-1: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for vitamin-rich organic: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for sustainably sourced: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for all-purpose liquid: Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden
- Best for compact bloom booster: Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1
- Best for soil microbiology boost: GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens
- Best for wintergreen deodorized: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Best for fish-guano fusion: 7265 Fish & Guano Liquid Plant Fertilizer for Transplants and Flowers
- Best for fast-acting kelp: Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1
- Best for salmon omega power: Bloom City Organic Wild Fish Fertilizer and Plant Supplement
Product Comparison: Best Fish Fertilizer For Flowers
Alaska Fish Fertilizer OMRI Listed 5-1-1, 115 oz
- 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
CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer, 1 Quart
- Promotes healthy plant growth with 11 vitamins
- Can be used on all indoor and outdoor plants
- 100-percent organic
- Stimulates microorganisms
- Does not burn
1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants, Flowers, Fruits & Vegetables, 2-3-1 NPK – Sustainably Sourced and Hydrolyzed for Steady Growth
- ORGANIC FISH EMULSION FERTILIZER – Our liquid fish fertilizer is made from sustainably sourced fish emulsion and we use up all the parts that would otherwise go to waste. Using an environmentally conscious method, ingredients are refined fresh and 100% cold pressed to help retain all of the nutrients, vitamins, and amino acids needed to grow healthy plants.
- GROW PLANTS NATURALLY – This wonderfully organic alternative to synthetic fertilizer contains a 2-3-1 NPK ratio perfect for light and frequent applications. Promotes steady, healthy plant development throughout the growing season.
- ENRICHES SOIL – Helps build a strong foundation for your organic garden to thrive on! Use as an effective soil drench to improve fertility, structure, and encourage the growth of beneficial microorganisms like fungi in your garden’s soil.
- PRODUCE MORE – Get the most out of your fertilizer and your garden! This organic garden fertilizer helps to increase crop yields and flower blooms. Gentle enough to use as a foliar spray makes this the perfect fish fertilizer for plants, flowers, and vegetables.
- SMELL THE DIFFERENCE – This fertilizer smells like fish because it’s made from fish! Crafted with high-quality concentrated and undiluted hydrolyzed fish emulsion each bottle gives off a pungent fishy aroma. When compared, we see it like this – if it doesn’t smell, then it’s not real fish!
Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden, Vegetables & Flowers | All-Natural Fish & Seaweed Formula Potted Plants & Garden Flowers (8 oz)
- ALL-PURPOSE PLANT FOOD FOR GARDEN & HOME: One versatile solution! Ideal liquid fertilizer for vegetables promoting yield, powerful flower fertilizer for vibrant blooms, effective indoor plants fertilizer, and general garden fertilizer for trees, shrubs, and containers.
Neptune’s Harvest Fish & Seaweed Fertilizer 2-3-1, 18 Ounce
- Grow a beautiful vegetable garden
- Flowers and foliage will be stronger and more colorful
- Blooms will be more plentiful, fragrant and longer lasting
- Easy to mix and apply by hand, sprayer, or drip line
GS Plant Foods Liquid Fish & Kelp Fertilizer (1 Gallon) – Organic Material Review Institute Listed Natural Plant Food for Home Gardens, Lawns, and Vegetables
- ORGANIC MATERIALS REVIEW INSTITUTE LISTED FOR TRUSTED GARDEN CARE Certified by OMRI for use in organic growing, GS Plant Foods Liquid Fish & Kelp Fertilizer delivers reliable, natural nutrition for vegetables, lawns, flowers, and shrubs.
- SEA-AND-SOIL BASED NUTRITION Made from North Atlantic seaweed (Ascophyllum nodosum) and fresh fish hydrolysate, this liquid concentrate provides essential nutrients and trace minerals that help support healthy soil and plant development.
- IMPROVES SOIL MICROBIOLOGY & NUTRIENT UPTAKE Supports a thriving soil ecosystem that promotes strong root systems and efficient nutrient absorption — the foundation for resilient, productive plants.
- EASY-TO-USE CONCENTRATE FOR ALL PLANTS Mix 2 oz per gallon of water and apply as a foliar spray or soil drench every 2–4 weeks. Safe for use on vegetables, fruits, ornamentals, turf, and houseplants.
- MADE IN THE USA – SUSTAINABLY PRODUCED Proudly produced by GS Plant Foods as a licensed fertilizer manufacturer. No synthetic chemicals, additives, or fillers — just natural ingredients formulated for healthy home gardens and hobby farms.
Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
- Will Not Burn
- Great for all plants
- Deodorized with Natural Wintergreen
- 5-1-1 fertilizer is an excellent source of organic plant nutrients
- Fish Fertilizer
7265 Fish & Guano Liquid Plant Fertilizer for Transplants and Flowers, 32 oz (1-Pack)
Down To Earth All Natural Fertilizers Organic Liquid Fish & Kelp Concentrate – Plant Food for Vegetable Gardens and Flower Beds – Makes up to 32 Gallons 2-4-1, 32 oz
- Fast‑acting liquid formula: Perfect for foliar feed or soil drench applications, supporting quick absorption and growth stimulation.
- Stimulates overall plant vigor: High phosphorus aids flowering and fruiting, while nitrogen supports lush foliage and root development.
- Organic & soil‑friendly: Helps promote beneficial microbial activity and sustainable soil health due to its fish and kelp base
- Versatile application rates: For general garden use: ¼–½ cup per gallon of water; for containers: 2–4 Tbsp per gallon; for houseplants: 2 Tbsp per gallon, repeated every 2–4 weeks depending on growth stage
- Watch out for odor: While extremely effective, many users report a strong fish-like odor characteristic of fish emulsions—though it typically subsides quickly and doesn’t linger long indoors
Bloom City Organic Wild Fish Fertilizer and Plant Supplement, Great for Roots and Soil, Made from Sustainable Salmon, 1/2 Pint (8 oz)
- FROM SUSTAINABLE ALASKAN SALMON: Great for Soil and Plants, for indoor and outdoor use.
- CONTAINS SALMON EMULSION AND SALMON OIL: Very high in omega 3 Fatty Acids for Plants. More Amino Acids than any other brand.
- SMELLS LIKE FISH: You know this is the good stuff, because is really really smells like ocean and fish.
- HIGHEST QUALITY, MOST POTENT, BEST VALUE, BIGGEST YIELD: Bloom City’s ingredients are better for plants, better for you, and better for the planet. Simply the best choice for the conscientious grower.
- FORMULATED AND MADE IN THE USA: Designed by botanists and plant chemists in Seattle, Washington. Bloom City chooses only the highest quality ingredient sources and manufacturing methods to create the world’s best craft growing nutrient systems.
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 NPK ratio is best for blooming flowers when using a fish fertilizer?
For flower production, a higher phosphorus ratio helps promote vibrant blooms, so a 2‑3‑1 or 2‑3‑2 NPK is ideal. Many of the listed products, such as the 1‑gallon Organic Fish Emulsion and the Neptune’s Harvest blend, use a 2‑3‑1 ratio that balances growth and flower development. Choose a formula that leans toward phosphorus but still provides enough nitrogen for healthy foliage.
How important is an OMRI listing for a fish fertilizer used on edible flowers?
An OMRI (Organic Materials Review Institute) listing guarantees the product meets organic standards, which is crucial if you plan to consume the flowers or grow them in an organic garden. Alaska Fish Fertilizer and GS Plant Foods Liquid Fish & Kelp are both OMRI listed, giving you confidence in their compliance. If organic certification isn’t a priority, non‑listed options can still perform well but may contain additives not allowed in certified organic production.
Which fish fertilizer offers the best value for large garden beds?
Value is a mix of price per ounce, concentration, and nutrient density. The 1‑gallon Organic Fish Emulsion provides a high nutrient content at a lower cost per ounce compared to smaller 18‑ounce bottles like Neptune’s Harvest. Additionally, the Alaska Fish Emulsion Concentrate (5‑1‑1) lets you dilute as needed, stretching the product further for extensive beds.
Will the strong fish odor be a problem for indoor flower containers?
All true fish emulsions have a noticeable scent, but the intensity varies. Products such as the Alaska Fish Emulsion are deodorized with natural wintergreen, reducing the smell, while Bloom City’s Wild Fish Fertilizer openly embraces the fishy aroma. If you grow flowers indoors, consider a deodorized option or apply the fertilizer outdoors and water the plants before bringing them inside.
How do fish‑and‑seaweed blends compare to pure fish emulsions for flower health?
Seaweed adds micronutrients, amino acids, and growth hormones that complement the nitrogen and phosphorus from fish, often resulting in stronger stems and longer‑lasting blooms. Blends like the Fish & Seaweed Fertilizer (2‑3‑1) and GS Plant Foods’ Fish & Kelp concentrate provide this synergy, whereas pure fish emulsions focus mainly on macronutrients. For maximum flower vigor, a blend is generally the better choice.
What application method gives the most consistent results for flower fertilization?
A soil drench mixed at the manufacturer’s recommended rate ensures nutrients reach the root zone where they are most effective. Many of the products, such as the 1‑gallon Organic Fish Emulsion and Down To Earth’s concentrate, work well as both drench and foliar spray, but a drench applied every 2‑4 weeks provides steady feeding for continuous bloom production. Always water the soil after application to help distribute the nutrients evenly.
Are there any hidden costs or considerations when choosing a fish fertilizer for flowers?
Beyond the purchase price, consider the dilution ratio, required equipment (sprayer vs. watering can), and any additional protective gear needed for handling strong odors. Concentrated formulas like Alaska’s 5‑1‑1 need more water, which can increase water usage, while ready‑to‑use blends may cost more per ounce but save time. Also, check if the product includes any additives that could affect soil pH or interact with other fertilizers you already use.