Comparison: Best 511 Fish Fertilizer (Updated | Dec 1st)

Fish fertilizers typically provide a 5-1-1 ratio, meaning 5% nitrogen, 1% phosphorus, and 1% potassium. This balance supports leafy growth, root development, and overall plant vigor. Look for additional micronutrients like iron, manganese, and zinc, which many of the listed products include.

Concentrated formulas, such as the 1‑gallon or 1‑quart concentrates, require dilution before application, usually 1‑2 tablespoons per gallon of water for foliage. Less concentrated options, like the 16 oz bottles, can be mixed at similar rates but may need more frequent applications. Always follow the label instructions to avoid over‑feeding.

For extensive garden beds, the 1‑gallon options (Alaska Fish Emulsion 5‑1‑1, Fertilome 1 gal, Liquinox 1 gal) provide the lowest cost per ounce and reduce the number of bottles you need to store. Buying in bulk also minimizes packaging waste. If you need a backup, the 2‑pack quart from Lilly Miller gives a convenient mid‑size quantity.

Most fish emulsion has a strong smell, but some products, like the Alaska Fish Emulsion, are deodorized with natural wintergreen to lessen the odor. If you plan to use the fertilizer indoors or near living spaces, a low‑odor option can improve comfort. Check product descriptions for terms like “deodorized” or “low odor.”

Look for OMRI‑listed status, which confirms the product meets organic standards; the Alaska Fish Fertilizer 5‑1‑1 carries this certification. Additionally, many items are labeled 100 % organic, indicating they contain no synthetic chemicals. These certifications are important if you are growing certified organic produce.

Liquinox emphasizes iron, manganese, and zinc, which can help with chlorosis and overall plant health. Central Garden Brands highlights 11 vitamins, while Fertilome focuses on the classic 5‑1‑1 macro nutrients without detailing extra micronutrients. Choose a product that matches any specific nutrient deficiencies you observe in your garden.

Multi‑packs, like the Lilly Miller 2‑pack quart, often provide a small discount per unit and ensure you have a consistent supply without reordering. They are convenient for gardeners who apply fertilizer regularly throughout the growing season. Single large bottles may still be cheaper per ounce, but multi‑packs reduce the risk of running out mid‑season.

Yes, most of the listed fish fertilizers are formulated for both indoor and outdoor use, including houseplants, vegetables, fruit trees, and ornamental shrubs. Just be sure to dilute according to the label and avoid over‑application, which can cause leaf burn even with “non‑burning” formulas. Regular, light feedings typically yield the best results for indoor plants.