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

Tomatoes thrive on a balanced ratio that supplies ample nitrogen for foliage and enough phosphorus and potassium for fruit set; a 2-3-1 or 5-1-1 ratio works well for most home growers. The 2-3-1 formulas give a gentler, more frequent feeding schedule, while 5-1-1 provides a stronger nitrogen boost for vigorous vegetative growth. Choose the ratio that matches your plant stage—higher nitrogen early on, then shift to a lower nitrogen, higher potassium mix as fruit develops.

Organic fish emulsions deliver nitrogen, micronutrients, amino acids, and growth hormones in a natural form that improves soil biology and long‑term fertility. Synthetic fertilizers often supply only the primary nutrients and can burn roots if over‑applied. With fish emulsion you get a slower, steadier release that reduces the risk of nutrient lockout and supports healthier, more productive tomato vines.

Yes, several products are deodorized or formulated to minimize odor, such as Alaska Fish Emulsion with natural wintergreen scent and Neptune’s Harvest, which uses a cold‑process that retains nutrients while eliminating the strong fish smell. Powdered fish fertilizers like the 12‑2‑2 fish protein powder also reduce odor because the dry form releases less scent during application. If scent is a priority, choose a deodorized liquid or a powder.

The 1‑gallon concentrates, like Harris Organic Plant and Lawn Fertilizer or the 1‑gallon Organic Fish Emulsion, provide the most gallons per dollar and can be diluted for many applications, making them cost‑effective for larger gardens. For smaller spaces, the 8‑oz bottle from Fish Emulsion Fertilizer (250 mL) is affordable but requires more frequent purchases. Generally, buying in bulk (1‑gallon or larger) gives the lowest cost per application.

Pure fish emulsion is low‑risk for burn, but over‑diluting or applying too concentrated a solution can cause leaf scorch. Follow the label’s mixing instructions—usually 1‑2 tablespoons per gallon of water for vegetables and 4 tablespoons per gallon for trees—and apply in the early morning or late afternoon to reduce leaf stress. Always water the soil before and after feeding to help distribute nutrients evenly.

Liquid emulsions are quick to mix, provide immediate nutrient availability, and are easy to apply as a foliar spray or soil drench, which is great for fast‑growing tomato seedlings. Powdered forms, like the 12‑2‑2 fish protein powder, have a longer shelf life, produce less odor, and can be mixed into large volumes of water for extensive garden beds. However, powders require an extra step to dissolve fully, while liquids may need more frequent re‑purchase due to lower concentration.

Most fish emulsions naturally include trace minerals, amino acids, and vitamins that support root development and disease resistance, as highlighted in the Harris and Central Garden Brands formulas. Products such as Neptune’s Harvest also retain fish oils and hormones that enhance nutrient uptake and improve fruit quality. Selecting a fish emulsion that lists micronutrient content ensures you’re feeding your tomato plants a more complete nutritional profile.