Comparison: Best Amazon Fish Emulsion Fertilizer (Updated | Dec 1st)

First, check the NPK ratio; a 5‑1‑1 blend is great for foliage, while higher phosphorus or potassium ratios suit fruiting plants. Next, consider concentration and package size—concentrates need more dilution but last longer, whereas ready‑to‑use formulas are convenient for small gardens. Finally, look for certifications like OMRI, odor control, and whether the product is liquid or powder, as these affect application method and storage.

Alaska’s version comes in a 1‑gallon concentrate that is deodorized with wintergreen, making it more pleasant for indoor use, while Fertilome offers both 16‑oz and 32‑oz bottles that are fully organic but retain a stronger fish smell. Both provide the same 5‑1‑1 nutrient profile, but Alaska’s product is marketed as non‑burning and suitable for all plant types, whereas Fertilome emphasizes deep green foliage and root development. Price‑per‑ounce is typically lower for the larger Alaska container, giving a better bulk value.

Liquid emulsions are easy to dilute on‑site and can be applied with a hose or sprayer, which speeds up coverage of big areas. Powdered forms, like the 12‑2‑2 fish protein powder, are ultra‑concentrated and have a reduced odor, but they require mixing a large batch of water before use. For very large plots, the powder may be more economical per acre, while liquids offer convenience and less prep time.

OMRI certification confirms that the product meets organic standards and can be used in certified organic farming without risking compliance violations. It also assures shoppers that the fertilizer contains no synthetic additives, which is important for gardeners who prioritize soil health and biodiversity. Products like Alaska Fish Fertilizer OMRI Listed and GS Plant Foods Liquid Fish & Kelp carry this label, adding credibility.

Nitrogen (the first number) drives leafy growth, making higher‑N formulas ideal for lawns, vegetables, and foliage plants. Phosphorus supports root development and flower formation, so a higher second number benefits seedlings and blooming plants. Potassium (the third number) improves overall plant vigor and disease resistance, which is especially useful for fruiting crops and stress‑prone gardens.

Generally, bulk liquid concentrates such as the 1‑gallon Alaska Fish Emulsion or the 1‑gallon GS Plant Foods Fish & Kelp provide the lowest cost per usable gallon after dilution. Powdered options like the 3.3‑lb 12‑2‑2 fish protein can stretch even further, covering up to 100 gallons of liquid feed, but they require extra mixing effort. If you prefer ready‑to‑use convenience, the larger liquid containers still tend to be the most economical for regular garden maintenance.

Odor is a common concern; deodorized formulas (e.g., Alaska’s wintergreen‑scented version) are designed for indoor or close‑quarter use and reduce the typical fishy smell. Some gardeners prefer the natural scent as an indicator of authenticity, but strong odors can be off‑putting in enclosed spaces. Choose a product that matches your tolerance level and the location where you’ll apply it.

Yes, most fish emulsions are labeled as safe for all plant types, including indoor foliage, outdoor vegetables, and trees, provided you follow the recommended dilution rates. Indoor use benefits from lower‑odor or deodorized formulas to keep the air pleasant, while outdoor applications can tolerate stronger scents. Always test a small amount on a few leaves first to ensure no leaf burn, especially with sensitive houseplants.