Seaweed
Liquid Fertilizer
Cold-Pressed Ascophyllum nodosum Extract
Our premium seaweed liquid fertilizer is cold-pressed from sustainably harvested Ascophyllum nodosum to preserve all natural bioactive compounds. Rich in growth hormones, amino acids, and micronutrients for superior crop performance.
What Is Seaweed Liquid Fertilizer and Why Do Farmers Use It?
Seaweed liquid fertilizer is a biostimulant derived from marine algae — most commonly Ascophyllum nodosum, a cold-water brown seaweed harvested from the North Atlantic. Unlike conventional NPK fertilizers that supply specific nutrients, seaweed fertilizer works by stimulating the plant's own growth mechanisms through a complex mixture of natural plant hormones, amino acids, polysaccharides, and trace minerals.
The primary active compounds in seaweed fertilizer include cytokinins (which stimulate cell division and delay leaf senescence), auxins (which promote root elongation and lateral root formation), gibberellins (which stimulate shoot growth and flowering), and alginic acid (which improves soil water retention and feeds beneficial soil microbes). Together, these compounds produce measurable improvements in crop yield, quality, and stress tolerance that conventional fertilizers cannot replicate.
For tropical crop farmers — particularly those growing mango, banana, and coffee — seaweed fertilizer has become an essential component of modern nutrition programs. Applied at flowering, it reduces fruit drop by providing natural cytokinins that signal the plant to retain developing fruits. Applied at fruit set, it improves cell division and fruit size. Applied during stress events such as drought or heat waves, it activates the plant's stress response pathways and significantly reduces yield losses.
Our seaweed liquid fertilizer is cold-pressed from sustainably harvested Ascophyllum nodosum to preserve all bioactive compounds. Cold-pressing (as opposed to chemical extraction or high-temperature processing) maintains the integrity of heat-sensitive growth hormones and amino acids that are destroyed in lower-quality products. The result is a premium seaweed extract with consistently high cytokinin activity — the key metric for seaweed fertilizer efficacy.
Seaweed fertilizer is also one of the most versatile products in the liquid fertilizer toolkit. It is compatible with all major NPK fertilizers, humic acid, amino acid fertilizers, and most pesticides. It can be applied via drip irrigation, foliar spray, or soil drench, making it suitable for all farm types and irrigation systems. And because it is OMRI certified organic, it can be used in both conventional and certified organic production systems.
Product, Packaging & Application Gallery
Real photos from our Qingdao manufacturing facility and customer farms
Key Benefits
Seaweed fertilizer is one of nature's most complete plant biostimulants. Here's why farmers worldwide rely on it.
Natural Growth Hormones
Rich in cytokinins, auxins, and gibberellins that stimulate cell division, root elongation, and shoot growth.
Enhanced Stress Resistance
Alginic acid and betaines help plants tolerate drought, heat, salinity, and frost stress.
Root Development
Promotes lateral root formation and root hair density, dramatically improving nutrient and water uptake.
Soil Microbiome
Feeds beneficial soil bacteria and mycorrhizal fungi, creating a thriving soil ecosystem.
OMRI Listed Organic
Certified for use in organic farming. Compliant with USDA NOP, EU Organic Regulation, and other standards.
Universal Compatibility
Compatible with all liquid fertilizers, pesticides, and drip irrigation systems. Zero clogging.
Technical Specifications
GreenGrow Seaweed Liquid Fertilizer — Technical Data Sheet
| Raw Material | Ascophyllum nodosum (cold-pressed) |
| Total Organic Matter | ≥ 18% |
| Alginic Acid | ≥ 8% |
| Mannitol | ≥ 2% |
| Amino Acids | ≥ 3% |
| Natural Cytokinin | ≥ 0.002% |
| pH | 5.0 – 7.0 |
| Appearance | Dark brown liquid |
| Solubility | 100% water soluble |
| Density | 1.05 – 1.15 g/mL |
Application Guide
Recommended application rates and timing for major crops.
| Crop | Application Rate | Timing | Method |
|---|---|---|---|
| Mango | 3-5 L/ha | Pre-flowering, fruit set | Drip / Foliar |
| Banana | 4-6 L/ha | Planting, vegetative growth | Drip Irrigation |
| Coffee | 3-5 L/ha | Flowering, cherry development | Foliar / Drip |
| Vegetables | 2-4 L/ha | Every 2 weeks | Drip / Foliar |
| Citrus | 4-6 L/ha | Pre-flowering, fruit set | Drip Irrigation |
| Rice | 3 L/ha | Tillering, panicle initiation | Foliar Spray |
Packaging & OEM Options
Available in multiple sizes for farms, distributors, and private label partners.
Private label and OEM manufacturing available for distributors. Minimum order: 1,000 L.
Inquire About OEMSeaweed Fertilizer — Common Questions
What is seaweed liquid fertilizer used for?
Seaweed liquid fertilizer is a biostimulant derived from marine algae (primarily Ascophyllum nodosum) that is used to improve plant growth, stress resistance, root development, and soil health. It is applied to all major crops including mango, banana, coffee, vegetables, and citrus via drip irrigation or foliar spray. Unlike conventional fertilizers, seaweed extract does not directly supply NPK nutrients but instead stimulates the plant's own growth mechanisms through natural hormones and bioactive compounds.
What are the benefits of seaweed fertilizer?
The key benefits of seaweed fertilizer include: (1) natural plant growth hormones (cytokinins, auxins, gibberellins) that stimulate cell division and root growth; (2) alginic acid and betaines that improve drought, heat, and salinity stress tolerance; (3) improved root development for better nutrient and water uptake; (4) enhanced soil microbiome activity; (5) reduced fruit drop when applied at flowering; and (6) improved fruit quality, Brix levels, and shelf life. Seaweed fertilizer is also OMRI certified for organic farming.
How often should I apply seaweed fertilizer?
For most crops, apply seaweed liquid fertilizer every 7–14 days during active growth stages. During critical periods such as flowering, fruit set, and stress events (drought, heat, transplanting), increase frequency to every 7 days. For maintenance applications during vegetative growth, every 14 days is sufficient. Seaweed fertilizer can be applied year-round and does not accumulate to toxic levels in soil.
Can seaweed fertilizer be mixed with other fertilizers?
Yes — seaweed liquid fertilizer is compatible with most liquid NPK fertilizers, humic acid, amino acid fertilizers, and most pesticides. Always perform a jar test before tank mixing: combine the products in a small container in the same ratio as the tank mix and check for precipitation or separation after 30 minutes. Avoid mixing with highly alkaline products (pH > 9) as this can degrade the bioactive compounds.
Is seaweed fertilizer suitable for organic farming?
Yes — our seaweed liquid fertilizer is OMRI Listed and compliant with USDA National Organic Program (NOP), EU Organic Regulation (EC 834/2007), and other major organic certification standards. It is cold-pressed from sustainably harvested Ascophyllum nodosum without chemical extraction, preserving all natural bioactive compounds while meeting organic certification requirements.
See This Product in Action — Crop Solutions
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