Comparison: Best Fish Emulsion Plant Food (Updated | Dec 1st)

Think about how many plants you have and how frequently you plan to fertilize. Smaller containers like the 8 oz bottle are convenient for indoor gardeners or occasional use, while a 1‑gallon jug offers better economics for larger beds or multiple seasons. Also check the recommended dilution rates to estimate how long a given size will last.

Most of the products use a 5‑1‑1 ratio, delivering 5 % nitrogen for leaf growth, 1 % phosphorus for root development, and 1 % potassium for overall vigor. The 2‑3‑1 formula found in one gallon option provides a higher phosphorus content, which can be beneficial for flowering and fruiting plants. Choose a ratio that matches the growth stage of your garden—higher nitrogen for foliage, higher phosphorus for blooms.

Yes, several brands are OMRI‑listed, meaning they meet organic standards for certified organic production (e.g., Alaska Fish Fertilizer OMRI Listed 5‑1‑1). Others explicitly state they are 100 % organic or use USDA‑approved ingredients. Selecting a certified product helps ensure you stay compliant with organic gardening guidelines.

Generally, bulk containers such as the 1‑gallon bottles provide the lowest cost per ounce, especially when the price per gallon is comparable across brands. The 5‑1‑1 concentrate from Alaska and the organic 2‑3‑1 gallon both deliver high nutrient density at a lower unit price than the smaller 8‑oz or 16‑oz options. Compare the total nutrient content and price per fluid ounce to determine true value.

Odor can be a concern for indoor growers or close‑quarter applications. Some formulations are deodorized with natural wintergreen or have reduced scent, like the Alaska Fish Emulsion Concentrate. If a strong fishy smell is acceptable, products that emphasize “real fish” aroma often indicate higher potency, but deodorized options are preferable for indoor use.

Yes, most of the listed fish emulsions are safe for indoor houseplants, outdoor garden beds, and even trees. The Central Garden Brands and Fertilome formulas specifically note suitability for all plant types, while the kelp‑infused GS Plant Foods blend works well on lawns and ornamental shrubs. Just follow the dilution instructions to avoid over‑application in confined indoor spaces.

Kelp provides trace minerals, hormones, and micronutrients that boost stress tolerance and root development, as seen in the GS Plant Foods Liquid Fish & Kelp Fertilizer. Salmon oil adds omega‑3 fatty acids, which can improve cell membrane health and enhance overall plant vigor, a feature highlighted by Bloom City’s salmon‑based product. These extras complement the base fish nutrients for a more balanced feeding program.

Most 5‑1‑1 emulsions recommend 1‑2 tablespoons per gallon of water for foliage plants and up to 4 tablespoons per gallon for trees, as shown on Fertilome labels. Concentrated gallon‑size products often suggest a 1‑part concentrate to 10‑parts water mix for regular feeding. Always start with the lowest recommended dilution and adjust based on plant response to avoid nutrient burn.