Comparison: Best Alaska Fish Fertilizer For Roses (Updated | Dec 1st)

Roses thrive on a balanced fertilizer with a higher potassium level, such as a 5‑1‑1 or 2‑4‑1 ratio, which promotes strong stems and abundant blooms. Alaska’s 5‑1‑1 formulas are especially popular for roses because they supply ample nitrogen for foliage while still providing enough phosphorus and potassium for flower development. If you prefer a lower nitrogen mix, Neptune’s Harvest 2‑4‑1 can also work well, but you may need to supplement with a potassium boost.

Alaska’s fish fertilizers are deodorized with natural wintergreen, making them virtually odor‑free during application. Neptune’s Harvest retains the fish proteins and oils, which can produce a mild fishy smell, though many users find it acceptable because the scent dissipates quickly. If scent is a concern for indoor or patio use, Alaska’s options are the quieter choice.

Yes, both Alaska’s 5‑1‑1 fertilizer and Central Garden Brands’ Fish Emul are OMRI listed, meaning they meet the standards for organic production. This certification assures you that the product contains no synthetic chemicals and can be used in certified organic rose beds. Choosing an OMRI‑listed product helps maintain organic certification and soil health.

The Alaska 5‑1‑1 32‑oz six‑pack provides a sizable amount of fertilizer at a lower per‑ounce cost, making it economical for extensive rose plantings. Heirloom Roses Founder’s Fish Fertilizer 2‑pack also offers good value with a premium organic formula, but the total volume is less than the six‑pack. For the most acreage coverage, the Alaska multi‑pack is the most cost‑effective.

All concentrated fish emulsions, including Alaska’s 5‑1‑1 and Neptune’s Harvest, should be diluted according to the label—typically one tablespoon per gallon of water for regular feeding. Dilution prevents leaf burn and ensures even distribution of nutrients across the root zone. For a quick top‑dressing, you can apply the concentrate directly at the soil surface, but watering in afterward is recommended.

Fish emulsions contain natural micronutrients, amino acids, and growth hormones that stimulate beneficial soil microorganisms. These microbes improve nutrient uptake, increase disease resistance, and enhance overall plant vigor, which is especially valuable for roses that are prone to fungal issues. Products like Central Garden Brands’ Fish Emul also claim to promote microorganism activity without burning the plants.

The nutrient concentration is the same across all package sizes; the main difference is convenience and cost per ounce. A gallon container, such as Alaska’s 1‑gallon concentrate, is ideal for gardeners who apply fertilizer frequently and want to minimize packaging waste. Smaller quart bottles, like the Lilly Miller 2‑pack, are handy for trial use or for gardeners with limited storage space.