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

The most important factor is the N-P-K ratio, which indicates the balance of nitrogen, phosphorus, and potassium; common ratios for fish emulsion are 5-1-1, 2-4-1, or 12-2-2. Look for products that also list additional vitamins, amino acids, and micronutrients, as these support overall plant health. Organic certification or OMRI listing can assure you that the fertilizer meets organic standards.

Liquid emulsions, like the 1‑quart Central Garden Brands or the 1‑gallon Alaska Fish Emulsion, are ready to dilute and apply, which is convenient for frequent feeding. Powdered options, such as the 12‑2‑2 fish protein powder, have lower odor and a longer shelf life, and a small amount can make many gallons of feed. Choose liquid for ease of use and powder if you prefer reduced smell and need to cover large areas economically.

Traditional fish emulsions can have a strong fishy smell, but some brands add deodorizing agents. The Alaska Fish Emulsion 5‑1‑1 Concentrate mentions a natural wintergreen deodorizer, while Neptune’s Harvest claims a virtually odor‑free formula due to its cold‑process method. If odor is a major concern for indoor use, look for these deodorized or low‑odor options.

For a few houseplants, a small container such as the 8 oz Fish Emulsion (B0DQR1X69R) or 1‑quart Central Garden Brands is sufficient and easier to store. Larger outdoor gardens benefit from gallon‑size containers like the 1‑gallon Alaska Fish Emulsion or the 3.3‑lb 12‑2‑2 powder, which provide enough product for repeated applications throughout the season. Consider how often you plan to feed and the total volume of water you’ll mix.

All listed products are marketed as safe for vegetables, fruits, and herbs, but it’s important to follow the recommended dilution rates to avoid over‑fertilizing. Look for OMRI‑listed or USDA‑organic certifications, such as the Alaska Fish Fertilizer, which indicate suitability for food crops. Always rinse leafy greens with clean water before harvest if you’ve applied a foliar spray shortly before picking.

Higher nitrogen ratios (e.g., 5‑1‑1) promote leafy growth and are ideal for vegetative stages of vegetables and indoor foliage. Lower nitrogen and higher phosphorus ratios, like 2‑4‑1, support flowering and fruiting, making them better for blooming plants and fruit production. Some growers rotate between ratios during the season to match the plant’s changing needs.

Generally, larger containers provide a lower cost per ounce; the 1‑gallon Alaska Fish Emulsion and the 3.3‑lb 12‑2‑2 powder have the most economical pricing for extensive use. Smaller bottles, such as the 8 oz or 1‑quart options, are pricier per ounce but are convenient for trial or limited indoor applications. Compare the total nutrient content and recommended application rates to calculate the true cost per feeding.

Yes, fish emulsion can be combined with other organic amendments like compost, worm castings, or slow‑release fertilizers to create a balanced feeding program. However, avoid mixing with strong chemical fertilizers that may cause nutrient imbalances or burn the roots. Always test a small batch first to ensure the combined solution maintains the proper pH and concentration for your plants.