Comparison: Best Fish Fertilizer Indoor Plants (Updated | Dec 1st)
But with so many options out there, how do you know which one’s best? We’ve tested top-rated fish fertilizers to see which delivers lush growth without the stink, sticky mess, or sky-high prices. Whether you’re nurturing a fiddle leaf fig or a jungle of pothos, the right formula can make all the difference.
- Best for vitamin-rich boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for odorless nutrient power: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for deep green growth: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Best for versatile seaweed feed: Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden
- Best for certified organic blend: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for wilt-stop formula: Indoor Plant Food | All-purpose House Plant Fertilizer | Liquid Common Houseplant Fertilizers for Potted Planting Soil | by Aquatic Arts
- Best for vegetative growth boost: Grow 3-1-2 Organic Liquid Fertilizer
- Best for omega-3 power: Bloom City Organic Wild Fish Fertilizer and Plant Supplement
- Best for sustainable soil surge: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for wintergreen burn-free: Alaska Fish Emulsion Fertilizer 5-1-1 Concentrate 1 Gallon (Packaging may vary)
Product Comparison: Best Fish Fertilizer Indoor Plants
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
Neptune’s Harvest Fish Fertilizer 2-4-1, 18 Ounce
- Neptune’s Harvest is an organic fertilizer made from fresh north Atlantic fish
- It is made by a unique cold process that protects the vitamins, amino acids, enzymes and growth hormones
- It also contains all the micro and macro nutrients naturally found in fish
- Unlike fish emulsions, Neptune’s Harvest retains the fish proteins and oils and has no unpleasant odor
Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
- Develops deep green foliage, vigorous root systems and a solid plant structure
- Derived from fish soluble, can be used from indoor and outdoor. Can be used on plants and trees.
- Mixes with water and can be used by any convenient method of application. Shake well before use.
- 5-1-1 Fertilizer contains 5% Nitrogen, 1% Phosphate and 1% Soluble Potash.
- For plants mix 1-2 tbsp per 1 gal of water. For trees mix 4 tbsp per gal of water.
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.
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
Indoor Plant Food | All-purpose House Plant Fertilizer | Liquid Common Houseplant Fertilizers for Potted Planting Soil | by Aquatic Arts
- FEED HOUSE PLANTS: liquid fertilizer promotes healthy growth and stops wilt better than granules or pellets. Our 3-1-2 Miracle ratio makes living indoor plants thrive in pots, holders, and hangers.
- GROW REAL HOME DECOR: 1 teaspoon for every 2 cups of water includes nitrogen, phosphorus and other vitamins to boost root and bloom growth — easy plant pot growing for up to 1 year.
- Poinsettia, Pothos, Spider Plant, ZZ Plant, Aglaonema, Dioon, Fittonia, Jade Plant, Hoya Plant, Plumeria Plants, Yucca Plant, Hostas, Heuchera Plants, Dracaena Plant, Azalea, Orchid, Snake Plant
- Peace Lily, Begonia, African Violet, Aloe Vera Plant, Weeping Fig, Calla Lillies, Prayer Plant, Philodendron Plant, Dieffenbachia, Croton Plant, Christmas Cactus, Air Plants, Indoor Cactus, Mums
- Rubber Plant, Anthurium, Areca Palm, Lady Palm, Cyclamen, Peacock Plant, Dendrobium, Deacaena, Kalanchoe, Syngonium, Oakleaf Ivy, Aspargus Fern, Bamboo Palm, Boston Fern, Gerbera Daisy, Kimberley
Grow 3-1-2 Organic Liquid Fertilizer, Vegitative, Fish Based, Safe, Organic, All Purpose, Nutrient, Plant Safe (8 Ounce)
- Optimal Growth Formula: Specifically designed for soil growers, suitable for both indoor and outdoor use in any soil media. Great for vegetable gardens, flowers, indoor plants and trees. Excellent nutrient to use on plants and herbs during the vegetative stage.
- Easy Application: No need to worry about PPM or PH levels (as long as tap water is within the normal range). Just one tablespoon mixed per gallon of water, fed weekly. Since its Organic you don’t have to worry about burning your plants or roots like with synthetic fertilizers.
- Organic: Registered Organic with the California Dept. of Food and Agriculture (CDFA), ensuring a safe and effective product. Keep the life and biology in your soil by using this premium organic fertilizer.
- Nutrient-Rich Ingredients: Made from sugar beet extract, corn steep liquor, reduced sugar molasses, and acidulated fish tankage to provide essential nutrients your plants will love.
- Complete Feeding Solution: Best results when used alongside other recommended Mission Fertilizers according to the feeding schedule. We have an organic solution for all stages of growth.
- Odor Notice: The strong odor is a normal characteristic of organic fertilizers and does not affect the product quality or performance.
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.
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!
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
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 key factors should I consider when choosing a fish fertilizer for indoor plants?
Look for a balanced NPK ratio that matches your plant’s growth stage, preferably a low‑to‑moderate nitrogen formula to avoid leaf burn. Check if the product is 100 % organic and OMRI listed, which ensures it meets organic gardening standards. Odor control is important for indoor use, so a deodorized or low‑smell formula can make a big difference. Finally, consider the concentration; a liquid concentrate lets you dilute to the exact strength you need.
How do the NPK ratios of the listed fish fertilizers affect indoor plant health?
Higher nitrogen (e.g., 5‑1‑1) promotes vigorous foliage, which is great for leafy houseplants but can cause soft growth if over‑applied. Ratios like 2‑3‑1 or 3‑1‑2 provide more phosphorus and potassium, supporting root development and blooming, making them suitable for flowering indoor plants. Choosing a ratio that aligns with your plant’s current needs helps avoid nutrient imbalances and promotes steady, healthy growth.
Which product offers the best value for frequent indoor use?
The 1‑gallon Alaska Fish Emulsion (5‑1‑1) provides a large volume at a lower per‑ounce cost, making it economical for regular feeding. Its concentrated formula means you only need a small amount per gallon of water, stretching the product over many applications. Additionally, it is deodorized with natural wintergreen, reducing indoor odor while still delivering full organic nutrition.
I’m sensitive to strong smells; which fish fertilizer is the least odorous?
Neptune’s Harvest Fish Fertilizer uses a cold‑process that retains nutrients while minimizing the typical fishy odor, making it one of the least smelly options. The Alaska Fish Emulsion also mentions a natural wintergreen deodorizer, which masks the fish scent. Both are good choices for indoor environments where odor is a concern.
Are there any certifications I should look for to ensure the fertilizer is truly organic?
Yes, look for OMRI listing, which confirms the product meets organic standards for use in certified organic gardening. The Alaska Fish Fertilizer (OMRI listed) and Grow 3‑1‑2 Organic Liquid Fertilizer both carry this certification. These labels guarantee the ingredients are derived from natural sources and free from prohibited synthetic chemicals.
How do liquid fish fertilizers compare to granular or pellet forms for indoor plants?
Liquid fertilizers dissolve quickly, allowing for even distribution and faster nutrient uptake, which is ideal for potted indoor plants. Granular or pellet forms release nutrients slowly and can be harder to apply evenly in small containers. For indoor use, a liquid concentrate like the Central Garden Brands Fish Emul or the Indoor Plant Food 3‑1‑2 provides precise dosing and reduces the risk of over‑fertilization.
Can I use the same fish fertilizer for both foliage and flowering indoor plants?
Yes, many of the listed products are all‑purpose formulas that support both leaf growth and bloom development. A balanced ratio such as 3‑1‑2 or 2‑3‑1 supplies sufficient phosphorus for flower formation while still providing nitrogen for foliage. Adjust the dilution rate according to the plant’s stage—slightly lower nitrogen during flowering can encourage better blooms.
What is the best way to apply liquid fish fertilizer to indoor plants?
Mix the recommended amount of concentrate with water—typically 1 teaspoon per 2 cups of water for most houseplants—and apply as a soil drench or foliar spray. Water the plant thoroughly after feeding to help distribute nutrients throughout the root zone. Repeat the feeding every 2‑4 weeks, adjusting frequency based on plant response and growth rate.