Fish & Seaweed Fertilizer 2-3-1
Best organic liquid fertilizer for home gardeners seeking healthier, more productive plants.
Nourish your plants with Neptune's Harvest Fish & Seaweed Fertilizer, a 2-3-1 liquid concentrate perfect for organic gardening. This OMRI-certified blend of hydrolyzed fish and seaweed provides essential nutrients for robust growth, vibrant blooms, and healthier foliage. It's designed to enhance crop yields, improve the shelf life of produce, and enrich soil health by boosting microbial activity. Ideal for vegetables, flowers, trees, shrubs, and houseplants, it promotes stronger plants and more bountiful harvests naturally.
$14.99
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4425
#50 in Fertilizers
Price vs Category Average
-76%
Below average
Organic Status
Certified Organic Product
/ Certified Organic Product
Who it's for
- Gardeners seeking comprehensive nutrition for robust plant health
- Organic growers focused on long-term soil vitality and structure
- Flower enthusiasts wanting stronger roots and more vibrant blooms
Who should skip it
- Indoor gardeners sensitive to strong, lingering organic odors
- Budget-conscious growers managing large plots or heavy-feeding plants
- Users preferring mess-free application and low-maintenance equipment
Performance breakdown
Organic Integrity
OMRI certification ensures complete compliance with strict organic gardening standards.
Nutrient Versatility
Balanced formula supports everything from delicate houseplants to heavy-feeding vegetable crops.
Application Flexibility
Liquid concentrate works seamlessly as both a foliar spray and soil drench.
Soil Enrichment
Active ingredients significantly boost microbial life for long-term soil health.
Absorption Speed
Quick-release formula provides plants with immediate access to essential nutrients.
Yield Enhancement
Consistent use noticeably improves both the volume and shelf-life of harvests.
Key Specs
Organic Status
Certified Organic Product
Fertilizer Source
Organic, Natural
Nitrogen Percentage
2.0%
Phosphorus Percentage
3.0%
Potassium Percentage
1.0%
Application Method
Foliar, Soil
Organic Certified
Yes
Container Weight
3.0 pounds
Features
- OMRI Certified for organic gardening
- Enhances foliage health and crop yields
- Improves shelf life of fruits and vegetables
- Promotes vibrant colors and plentiful blooms
- Boosts soil structure and microbial activity
- Derived from natural fish and seaweed sources
- Suitable for vegetables, flowers, and houseplants
- Balanced 2-3-1 NPK ratio
What customers say
Gardeners overwhelmingly value Neptune's Harvest Fish & Seaweed Fertilizer for its exceptional quality and rapid, visible results. Users report significant improvements in plant vigor, foliage density, and overall yield across diverse crops. The blend of fish emulsion and seaweed extract is credited for promoting robust root development and increased stress resistance. While the product delivers premium nutritional value, the potent fish odor is the primary drawback. Despite this temporary olfactory inconvenience, the consensus is that the fertilizer's high performance and versatility as a soil drench or foliar spray make it an indispensable, worthwhile investment for serious organic cultivation.
Know before you buy
Yes, Neptune's Harvest Fish & Seaweed Fertilizer is suitable for houseplants. Because it is a liquid concentrate, ensure you dilute it according to the instructions to avoid over-fertilizing your indoor plants.
As a product derived from natural fish, it does have a distinct, earthy scent when first applied. However, the smell typically dissipates quickly once the fertilizer is absorbed into the soil or dries on the foliage.
This fertilizer is versatile and can be applied both as a soil drench and as a foliar spray. Applying it to the leaves allows for quick nutrient absorption, while soil application helps improve overall microbial activity in the root zone.
The 2-3-1 ratio indicates a balanced blend of nitrogen, phosphorus, and potassium, with a slight emphasis on phosphorus. This makes it particularly effective for supporting root development, flower production, and overall plant vigor.
Yes, this product is OMRI-certified, meaning it meets the standards required for use in organic gardening. You can safely use it on your vegetable crops without synthetic chemicals.
Because this is a quick-release liquid formula, plants can absorb the nutrients almost immediately. You should notice improvements in foliage color and plant vitality relatively quickly, though consistent use is recommended for the best long-term results.
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$15