Comparison: Best Fish Fertilizer For Indoor Plants (Updated | Dec 1st)
We’ve dug into the smelly (but effective!) world of fish-based fertilizers to find the top picks that deliver lush growth without the guesswork. Whether you’re nurturing a fiddle leaf fig or a thriving pothos, we’ll help you choose a formula that’s easy to use, odor-controlled, and packed with nutrients your plants will love.
- Best for vitamin-rich boost: CENTRAL GARDEN BRANDS 100099247 Fish Emul Fertilizer
- Best for all-purpose power: Fish & Seaweed Fertilizer (2-3-1) | All Purpose Liquid Plant Food for Indoor Plants & Outdoor Garden
- Best for odor-free nutrition: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for omri certified: Alaska Fish Fertilizer OMRI Listed 5-1-1
- Best for root-boost formula: Fertilome (10611) Fish Emulsion Fertilizer 5-1-1 (16 oz)
- Best for houseplant miracle: Indoor Plant Food | All-purpose House Plant Fertilizer | Liquid Common Houseplant Fertilizers for Potted Planting Soil | by Aquatic Arts
- Best for yield-boost emulsion: 1 Gallon Organic Fish Emulsion Fertilizer for Plants – Ideal Liquid Fish Fertilizer for Plants
- Best for large-scale nutrition: Neptune’s Harvest Fish Fertilizer 2-4-1
- Best for salmon strength: Fish Emulsion Fertilizer
- Best for extended green growth: Fertilome (10612) Fish Emulsion Fertilizer 5-1-1 (32 oz)
Product Comparison: Best Fish Fertilizer For 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
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 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
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
Fertilome (10611) Fish Emulsion Fertilizer 5-1-1 (16 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.
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
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!
Neptune’s Harvest Fish Fertilizer 2-4-1, 36 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
Fish Emulsion Fertilizer, Complete Fish Emulsion Plant Food, 8 oz (250mL)
- Complete fish fertilizer for thriving plants
- Helps growth with natural harvest salmon nutrients
- Easy-to-follow care instructions included
- Made in the USA
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.
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 at the NPK ratio to match your plant’s nutrient needs, the concentration of vitamins and amino acids, and whether the product is truly organic. Also consider the odor level, as some emulsions are less pungent, and check for certifications like OMRI for organic gardening. Finally, compare the recommended dilution rates to ensure easy application for indoor settings.
How does the Central Garden Brands Fish Emulsion compare to Neptune’s Harvest in terms of nutrient content?
Central Garden Brands offers an 11‑vitamin blend with a balanced formula that is gentle enough for all indoor and outdoor plants, while Neptune’s Harvest provides a 2‑4‑1 ratio that emphasizes higher phosphorus for blooming. Neptune’s Harvest is processed cold to retain enzymes and has virtually no odor, whereas Central Garden Brands may have a milder scent but fewer detailed nutrient specs. Both are organic, but Neptune’s Harvest may deliver more growth hormones.
Is the Alaska Fish Fertilizer OMRI‑listed a good value for indoor gardening?
The Alaska Fish Fertilizer comes in a large 115‑oz container, offering a low cost per ounce compared to smaller bottles. Its 5‑1‑1 NPK ratio is suitable for foliage growth, and the OMRI listing assures compliance with organic standards, which adds confidence for eco‑conscious growers. The size may be more than needed for indoor use, so consider storage space before purchasing.
Which product is best for minimizing odor while still providing strong nutrition?
Neptune’s Harvest Fish Fertilizer (both 18‑oz and 36‑oz sizes) is renowned for its low‑odor profile due to the cold‑process that retains nutrients without the typical fishy smell. In contrast, the 1‑gallon Organic Fish Emulsion explicitly mentions a strong fish odor, which may be undesirable in indoor environments. For a balance of scent and performance, Neptune’s Harvest is the preferred choice.
How do liquid versus emulsion formulas affect application for houseplants?
Liquid fertilizers like the Indoor Plant Food (3‑1‑2 ratio) dissolve instantly, making them ideal for quick watering cycles and foliar sprays. Emulsion products such as Fertilome 5‑1‑1 require thorough shaking and dilution, which can be slightly more time‑consuming but often provide a slower release of nutrients. Choose liquids for convenience and emulsions if you prefer a steadier nutrient feed.
What is the advantage of a 2‑3‑1 NPK ratio for indoor plants?
A 2‑3‑1 ratio supplies moderate nitrogen for leaf growth, higher phosphorus to encourage root development and blooming, and lower potassium for overall plant health. This balance works well for most indoor foliage and flowering species, providing steady growth without excessive foliage that can become leggy. Products like the Fish & Seaweed Fertilizer and the 1‑gallon Organic Fish Emulsion use this ratio.
Are larger containers like the 1‑gallon fish emulsion cost‑effective for occasional indoor use?
While the per‑gallon price of a 1‑gallon container is lower, the volume may be excessive if you only fertilize a few houseplants a few times a season. Excess product can sit unused and potentially degrade over time, reducing its effectiveness. For occasional indoor growers, smaller 8‑oz or 16‑oz bottles provide better freshness and less waste.
Do any of these fertilizers include additional micronutrients or beneficial microbes?
Central Garden Brands mentions stimulation of microorganisms, which can improve soil health, while Neptune’s Harvest highlights the presence of natural enzymes and growth hormones. The 1‑gallon Organic Fish Emulsion also notes enrichment of beneficial fungi in the soil. If micronutrient diversity is important to you, these products offer added value beyond basic NPK.