Neptune's Harvest Organic Hydrolyzed Fish Fertilizer
Best organic liquid fertilizer for health-conscious indoor and outdoor gardeners.
Elevate your organic garden with Neptune's Harvest Hydrolyzed Fish Fertilizer. This premium liquid concentrate is crafted using a unique cold process that preserves natural, heat-sensitive nutrients from high-quality North Atlantic fish. It retains all proteins and oils, resulting in an odor-free formula that is OMRI Listed for certified organic use. Ideal for vegetables, flowers, fruits, lawns, and houseplants, it provides balanced nutrition for vibrant growth indoors and out, supporting a thriving ecosystem.
$15.95
Owner Satisfaction
4.5
/ 5
Category Rank
3091
/ 4425
#3091 in Fertilizers
Price vs Category Average
-74%
Below average
NPK Ratio
241
/ --
Who it's for
- Gardeners seeking rapid nutrient uptake for healthier plant growth
- Eco-conscious growers focused on long-term soil health and vitality
- Organic farmers needing certified safe inputs for edible crops
Who should skip it
- Indoor gardeners sensitive to strong, lingering natural scents
- Users relying on fine-mist sprayers or automated irrigation systems
- Budget-focused gardeners preferring lower-cost synthetic alternatives
Performance breakdown
Nutrient Bioavailability
Cold-processing preserves essential proteins and oils for maximum plant absorption.
Application Versatility
Safe and effective for everything from delicate houseplants to outdoor vegetable patches.
Odor Profile
Advanced hydrolysis eliminates the typical pungent fish smell during indoor use.
Organic Integrity
OMRI listing guarantees strict adherence to high-standard organic gardening practices.
Concentrate Potency
Highly concentrated formula ensures a little goes a long way per application.
Ease of Mixing
Liquid consistency blends seamlessly with water for quick, mess-free preparation.
Key Specs
NPK Ratio
2-4-1
Package Size
36 oz (Quart)
Processing Method
Cold process
Odor Profile
No unpleasant odor
Fertilizer Type
Fish Hydrolysate
Fertilizer Source
Organic
Nitrogen Percentage
2.0%
Phosphorus Percentage
4.0%
Features
- Preserves heat-sensitive nutrients with cold processing.
- Made from premium North Atlantic fish.
- Odor-free formulation for pleasant use.
- OMRI Listed for organic gardening.
- Versatile for all indoor/outdoor plants.
- Retains natural proteins and oils.
- Supports vegetable, fruit, and flower growth.
What customers say
Customers overwhelmingly praise Neptune's Harvest Fish Fertilizer for its exceptional efficacy and visible results across all plant types. Gardeners consistently report rapid improvements, noting lush foliage, robust growth, and significantly increased yields. The organic nature and the hydrolyzed process are highlighted as key factors delivering superior, reliable performance compared to standard emulsions. The core trade-off involves the strong, persistent fish odor, which many find intense. Despite this drawback, the consensus remains that the powerful, professional grade outcomes fully justify the inconvenience. This product is viewed as a premium staple for serious gardeners seeking maximized potential.
Know before you buy
Yes. Because it uses a cold-process hydrolysis method rather than heat, it avoids the strong, pungent fishy smell typically associated with traditional fish emulsions.
Absolutely. The formula is clean and odor-free, making it safe and pleasant for indoor use. Just be sure to dilute it according to the instructions to avoid over-fertilizing your potted plants.
This ratio indicates the fertilizer is higher in phosphorus (4%) than nitrogen (2%) or potassium (1%). This makes it particularly effective for supporting root development and encouraging flower and fruit production.
Yes, it is OMRI Listed, which means it has been reviewed and approved for use in organic production systems.
Cold processing preserves essential proteins, oils, and heat-sensitive nutrients that are often destroyed by high-heat manufacturing. This ensures your plants receive a more complete and bioavailable spectrum of nutrients.
Yes, this is a concentrated liquid formula. You must dilute it with water according to the label instructions before applying it to your soil or foliage.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$16