SONIC Liquid Seaweed Biological Fertiliser
Mineral and Microbial Soil Amendment
- Min. 180L per product
- Made fresh for optimal results
- No artificial additives or preservatives
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*Limited stock available. Made to order (allow 10–12 weeks for processing). Contact us for availability.
SONIC Liquid Seaweed
Biological Fertiliser
Nourish plant growth from seed to harvest. Activated with beneficial microorganisms, this 100% natural Liquid Seaweed (Kelp) Biological Fertiliser can be applied at any time of the growing season to promote strong root systems, and produce highly nutritious crops.
Pricing Guide
Choose your Supply Option
MADE-TO-ORDER BIOFERTILISER PRODUCTS

$2.30-3.90/L
Liquid fish and seaweed biological products made and supplied fresh starting from 180L per product.
✔ Products delivered ready to use
✔ Produced to specifications
✔ Ideal for convenience
✔ Australia-wide delivery
✔ Container refill-program (optional)
*Limited stock available. Made to order (10–12 weeks lead time). Contact us for product availability.
ON-FARM PRODUCTION SYSTEM & TRAINING

$1.80-3.50/L (initial) ~$1.20/L (ongoing)
On-farm production system with training included starting at 540L combined products.
✔ Live 1:1 training at first batch start
✔ Scalable on-farm production system
✔ Designed for repeatable batch production
✔ Raw ingredients supplied (Australian)
✔ Quality outcomes guaranteed
Initial cost includes first-batch setup and training. Subsequent batches typically produce at approximately $1.20/L. Read more.
ON-FARM PRODUCTION SERVICES
$2.20-3.80/L
Complete on-farm setup and system management by our expert operators starting at 2,000L combined products.
✔ Fully managed production on-farm
✔ Freshly processed products for time of use
✔ Ideal for larger or time-poor operations
✔ Raw ingredients supplied (Australian)
✔ Quality outcomes guaranteed
On-farm production services are subject to operator availability, location, and regional service coverage.
Feed your crops with 100% natural Liquid Seaweed (Kelp) Fertiliser containing organic minerals, trace elements, vitamins, carbohydrates, amino acids, essential fatty acids, growth factors and anti-oxidants. With seaweed’s natural alginates, it also provides superior gelling properties that provide moisture holding abilities in the soil.
- Diverse Uses: Beneficial for mixed crops, natives, orchards, fruit trees, and pasture.
- Strengthens Plants against environmental stresses including drought, salty soil and frost.
- Root Stimulation: Supports strong roots and early growth.
- Assists Chlorophyll Production: Healthier, greener plants.
- Promotes Nutritional Value: Can accentuate taste, aroma and extend shelf life.
- 100% Biodegradable: Leaves no toxic residue in soil, requires no withholding period.
SONIC Liquid Seaweed Organic Fertiliser for plants is derived from Australian Durvillaea Potatorum (Bull Kelp), and made with beneficial microbe cultures. No fillers, additives or preservatives.
DIY SYSTEM COST SAVINGS
You really can see the difference, just driving up the road. We’re happy, and it has actually saved us a lot of money on extra fertilisers.
SONIC LIQUID SEAWEED
More Than Just a Fertiliser
SONIC Liquid Seaweed Biological Fertiliser is a naturally balanced nutrient solution that offers a wealth of benefits for your farm, garden and plants. Derived from 100% Australian organic seaweed (kelp), this seaweed liquid fertiliser contains over 60 essential elements.
The fermentation process used to create SONIC Liquid Seaweed breaks down the complex compounds in the seaweed into simpler, more bioavailable forms. This allows the nutrients to be quickly absorbed and used by your plants, leading to improved nutrient uptake and healthier growth.
The minerals and trace elements in SONIC Liquid Seaweed Fertiliser is in a form that plants can readily access, making this organic liquid seaweed fertiliser highly efficient and effective for nourishing your crops.

Unlike synthetic fertilisers, SONIC Liquid Seaweed Biological Fertiliser for plants provides a holistic approach to nourishing your crops. The diverse array of macro and micronutrients work synergistically to support strong root development, vibrant foliage, and nutrient-dense fruit. Regular application can also enhance a plant’s natural defense mechanisms against environmental stresses and disease.
Whether you’re caring for pastures, vegetables, flowers, trees, or houseplants, incorporating Liquid Seaweed Biological Fertiliser into your regimen, it is an excellent way to give your plants the balanced organic nutrition they needs to thrive.
SEAWEED BIOLOGICAL FERTILISER BENEFITS
Delivers Organic Minerals and Trace Elements
One key benefit of using Liquid Seaweed (Kelp) Fertiliser is its rich organic nutrient content. Seaweed is packed with essential minerals, including nitrogen, phosphorus, potassium, and trace elements such as iron, zinc, and magnesium. Because of the cold fermentation process, these essential nutrients are bio-available and readily absorbed by plants, promoting robust root growth, improved flowering and fruiting, and overall plant vigor.
Contributes to Soil Structure
Liquid Seaweed Biological Fertiliser has the ability to promote better soil structure. When applied to the soil, under brown or green ground cover, the compounds present in seaweed help bind soil particles together, resulting in improved soil aggregation. The enhanced soil structure allows for better water infiltration and retention, reducing the risk of erosion and improving overall soil health.
Provides Natural Growth Hormones
When Liquid Seaweed Fertiliser is applied to plants, the natural growth hormones, such as auxins, cytokinins, and gibberellins, play a crucial role in regulating various physiological processes in plants, including cell division, elongation, and differentiation.
Enhances Taste, Colour and Nutritional Content of Food
One of the key advantages of using Liquid Seaweed Fertiliser is its impact on taste. It has been found that plants treated with Seaweed Biological Fertiliser have improved flavour profiles compared to those grown with chemical-based fertilisers. The natural compounds present in seaweed can enhance the overall taste and aroma of fruits, vegetables, and other edible crops.

In addition to enhancing taste, Liquid Seaweed Fertiliser also contributes to enhancing the colour and texture of food. The minerals and trace elements found in seaweed help plants develop vibrant colours, and improve the visual appeal of fruits and vegetables.
Moreover, Liquid Seaweed Fertiliser is known for its ability to enrich the nutritional content of food.
Seaweed Kelp is rich sources of essential minerals such as potassium, magnesium, calcium, iron, and iodine. When used as a liquid fertiliser for plants, these nutrients are absorbed by the crops and subsequently passed on to consumers when they consume these foods.
Increased Plant and Crop Resilience
Another key advantage of using Liquid Seaweed Fertiliser is its ability to boost a plant’s immune system. Seaweed Kelp is rich in bioactive compounds such as polysaccharides, amino acids, and vitamins that stimulate the production of plant defense mechanisms. These compounds help plants to build stronger cell walls, activate defense genes, and produce antimicrobial substances that can fend off diseases and pests.
Liquid Seaweed Biological Fertiliser can also help in enhancing plant tolerance to climatic stresses such as drought, salinity, and extreme temperatures. Seaweed Kelp contains osmoprotectants that help plants retain water during dry periods or excessive salt exposure. Seaweed also contains antioxidants that scavenge harmful free radicals produced under stressful condition.
The organic nature of SONIC Liquid Seaweed Biological Fertiliser makes it an environmentally friendly choice for gardeners and farmers alike. Furthermore, it does not contain synthetic chemicals or harmful additives that can have negative impacts on soil health, the natural ecosystem, or water quality.
Click here to read ‘Key Benefits of Using Liquid Seaweed Fertiliser for Plants’
Ready To Transform Your Soil?

5 ha Avocados at Kilburney Farm, Central Coast, NSW, using regenerative farming principals, GreenBlower Mulch and SONIC Liquid Fish and Seaweed Biological Fertiliser, (Above image).
GREAT RESULTS
If I see something once and something that dramatic, I know it’s got to be doing good.
How Does Liquid Seaweed Biological Fertiliser Work?
SONIC Liquid Seaweed (Kelp) Biological Fertiliser is a unique product that harnesses the power of both beneficial microbes and the natural chelating properties of seaweed. This combination works to release locked-up minerals in the soil, making them more readily available for plant uptake.
The key lies in the synergistic relationship between the microbes and the seaweed. The microbes help to break down organic matter, freeing up essential nutrients like nitrogen, phosphorus, and potassium. Meanwhile, the seaweed’s natural chelating ability binds to these nutrients, preventing them from being leached away or becoming unavailable to plants.
This dual-action approach ensures that your plants have access to the vital organic minerals they need to thrive, without the risk of nutrient deficiencies or imbalances. By applying Seaweed Biological Fertiliser, you can support overall soil health and fertility, leading to stronger, more resilient plants.
Containing the hormones gibberellin and auxin, SONIC Liquid Seaweed Fertiliser functions as a growth enhancer, as well as delivering naturally balanced vitamins, enzymes, and over 60 trace elements. Liquid Seaweed promotes early growth, improves root and stem strength, and contributes to cold hardiness in plants.

Boost Soil Health by Stimulating Beneficial Microbes
When applied to the soil, Liquid Seaweed Biological Fertiliser stimulates soil bacteria. An increase in biological activity in the soil has many benefits including increased soil fertility, strong growth in plants, and natural plant immunity.
See Article – ‘Top 7 Benefits of Using Seaweed in Agriculture’

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