Comparison: Best Fish Fertilizer 511 (Updated | Nov 30th)

Most fish emulsion products use a 5‑1‑1 ratio, which provides a balanced source of nitrogen, phosphorus, and potassium for overall plant health. This ratio is ideal for promoting leafy growth while still supporting root development and fruiting. If you need more bloom or fruit production, consider a higher phosphorus or potassium formulation, but 5‑1‑1 works well for most garden plants.

Larger containers, such as 1‑gallon gallons, usually offer a lower cost per ounce compared to quart or 115 oz bottles, making them more economical for frequent users. However, concentrated formulas may require more dilution, so factor in the number of applications you’ll need per season. For occasional gardeners, a smaller quart or 2‑pack can be more convenient and reduce waste.

Yes, an OMRI (Organic Materials Review Institute) listing confirms that the fertilizer meets strict organic standards and can be used in certified organic production. Products like Alaska Fish Fertilizer and Central Garden Brands carry this certification, giving you confidence that no prohibited synthetic chemicals are present. If you garden organically, prioritize OMRI‑listed options.

Fish emulsions are generally non‑burning because they contain low concentrations of soluble salts, but over‑application can still cause leaf scorch. Always follow the label’s dilution rates—typically 1–2 tablespoons per gallon of water for vegetables and 4 tablespoons per gallon for trees. Applying the solution in the early morning or late afternoon reduces the risk of sun‑related burn.

All fish fertilizers have a natural fishy smell, but some brands add deodorizing agents, such as natural wintergreen in Alaska Fish Emulsion, to lessen the aroma. If you garden close to living spaces, a deodorized product can make handling more pleasant. Keep in mind that a milder scent does not indicate lower nutrient content.

Beyond the primary N‑P‑K, many fish emulsions include iron, manganese, and zinc, which support chlorophyll production and enzyme function. Liquinox and similar formulas list these micronutrients explicitly, offering a more complete nutrition profile. If your soil test shows micronutrient deficiencies, choose a product that lists these extras.

Concentrates, like the Alaska 5‑1‑1 gallon, require dilution and give you flexibility to adjust strength for different plant types. Ready‑to‑use quart bottles are pre‑mixed, saving time and reducing the chance of mixing errors, but they may be more expensive per use. Consider your comfort with measuring and how often you plan to fertilize when choosing between the two.

Fish emulsions can be applied as a soil drench, foliar spray, or added to potting mixes, making them versatile for both indoor and outdoor settings. Indoor growers often prefer a gentle soil drench to avoid excess moisture on foliage, while outdoor gardeners may use foliar sprays for quick nutrient uptake. Always test a small area first to ensure the plant tolerates the application method.

For extensive use, a 1‑gallon concentrate such as the Alaska Fish Emulsion or Liquinox provides the lowest cost per application and enough volume for multiple seasons. These larger containers also typically include additional micronutrients and are OMRI‑listed, adding both nutritional and certification value. Pair the gallon size with a proper dilution schedule to maximize coverage while minimizing waste.