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  • Seaweed Secrets - 10L
Seaweed Secrets - 10L

Seaweed Secrets - 10L

Use much less per square metre than major brands

$89.95
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Product Description

Premium Liquid Seaweed Soil Conditioner with Kelp, Humic & Fulvic Acid

For Healthier Soil, Stronger Plants & Greener Lawns – Naturally

Seaweed Secrets isn’t your average seaweed fertiliser—it’s a supercharged soil conditioner that supports your plants from early stages to full bloom. Infused with powerful Ascophyllum nodosum kelp, humic acid and fulvic acid, this liquid formula nourishes the soil and strengthens plants at every stage of growth. Whether you’re caring for a veggie patch, flower bed, fruit tree, or a buffalo or kikuyu lawn, Seaweed Secrets helps you grow lush, resilient plants with deeper roots and vibrant growth—all while staying eco-friendly and safe around pets and kids.

Simple to Use. Powerful Results.

  • Made with Premium Kelp (Ascophyllum nodosum) – Naturally rich in over 70 minerals, amino acids, and plant growth hormones
  • Enhanced with Humic & Fulvic Acids – Improves nutrient availability, root development, and soil structure
  • Safe, Organic, and Sustainable – Ideal for eco-conscious gardeners and sustainable farms
  • Works Through the Whole Lifecycle – From early growth to flowering, fruiting, and recovery
  • Pet- and People-Safe – Non-toxic and gentle on the environment

 

Where to use Seaweed Secrets: 

Lawns (Buffalo, Couch, Kikuyu & More)

  • Strengthens root systems and promotes lush green colour
  • Improves drought resistance and soil moisture retention
  • Boosts recovery after mowing or heavy traffic
  • Safe for use year-round as part of your lawn care routine

Gardens (Veggies, Flowers, Trees, Pots)

  • Encourages better flowering, fruiting, and root growth
  • Helps plants recover from stress (heat, cold, wind, transplant shock)
  • Improves soil aeration and nutrient uptake
  • Suitable for raised beds, garden beds, pots and indoor plants

Farms & Larger Properties

  • Promotes microbial activity and reduces nutrient “lock-up”
  • Improves soil tilth and long-term fertility
  • Compatible with most spray or fertigation systems
  • Supports regenerative and organic farming practices

 

Using Seaweed Secrets provides numerous benefits for your garden and lawn:

Benefit Description
Nutrient-Rich Formula Seaweed, specifically Ascophyllum nodosum, is packed with 77 minerals, 17 amino acids, complex sugars, and chelating agents. Combined with high-quality Humic and Fulvic Acid, this nutrient-rich solution boosts soil health, helping plants thrive. Kelp is a vital soil enrichment product that promotes healthy plant development, making it ideal for lawns, trees, and garden plants.
Improved Soil Health Seaweed improves soil structure and fertility by enhancing moisture retention, aeration, and drainage. This leads to healthier root systems and better nutrient uptake, fostering stronger plants.
Enhanced Plant Growth The growth-promoting hormones in liquid seaweed stimulate plant growth, resulting in increased leaf and stem growth, improved flowering and fruiting, and overall plant vigour. It helps boost plant development, making it an essential addition to any garden or lawn care program.
Stress Tolerance Seaweed extracts contain natural compounds that help plants endure environmental stresses, including drought, heat, cold, and disease. These compounds boost plant resilience, helping them recover from adverse conditions and thrive.
Increased Nutrient Absorption Seaweed's organic compounds act as chelating agents, improving the availability and absorption of nutrients, ensuring your plants get the maximum benefit from the soil. This leads to more productive and healthier plants.
Disease & Pest Resistance Seaweed extracts enhance the plant’s natural defences, making them more resistant to diseases and pests. It helps reduce the need for chemical pesticides and fungicides, promoting a more eco-friendly approach to plant care.
Environmental Sustainability Liquid seaweed is a sustainable, eco-friendly fertiliser derived from renewable marine resources. It does not contribute to water pollution and helps maintain beneficial soil organisms, making it a safe and responsible choice for your lawn and garden.
Safe for Humans and Pets Seaweed extracts are non-toxic and safe to use around humans and pets. There is no need for protective clothing or equipment when applying, making it a user-friendly solution for your garden care needs.

Seaweed Secrets is more than just a fertiliser – it’s a soil conditioner that enhances the long-term health and fertility of your garden and lawn. By improving soil structure, increasing moisture retention, and supporting beneficial soil organisms, Seaweed Secrets creates an ideal environment for plants to thrive.

The Science Behind Seaweed Secrets

Seaweed Secrets is based on the synergistic action of cold-processed kelp extract, humic acid, and fulvic acid, acting as natural biostimulants and nutrient chelators. It works by:

  • Stimulating root zone microbes to convert bound nutrients into plant-available forms
  • Improving Cation Exchange Capacity (CEC) in the soil, aiding nutrient retention
  • Enhancing stress tolerance through cytokinin and auxin compounds naturally found in seaweed
  • Supporting nutrient absorption across a wide pH range
  • Strengthening plants’ natural defence mechanisms, reducing reliance on synthetic pesticides
N
Nitrogen
0.04–0.07%
P
Phosphorus
0.05–0.15%
K
Potassium
2500–6000 ppm
S
Sulphur
400–1200 ppm
Mg
Magnesium
<0.40%
Ca
Calcium
<0.01%
B
Boron
0.13%
Fe
Iron
<0.10%
Zn
Zinc
1–5 ppm
pH
Soil pH
8–9

 

Product Summary: Details
Form Liquid Concentrate
Use Cases Lawns, gardens, trees, farms
Application Watering can, hose-on, foliar spray
Compatibility Do not use with iron-based products
Origin Made in Australia

 

If you're looking for a natural way to grow stronger, more resilient plants and improve your soil in the process—Seaweed Secrets is your go-to. From home gardeners to commercial growers, it's the eco-friendly edge your lawn, garden or farm deserves.

Safety Guidelines

Keep out of reach of children. May be harmful if swallowed. If eaten seek medical help. ALWAYS TRIAL BEFORE CHANGE. Before a new rate, product or application method is used, a small trial is recommended. Warranty of this material, either expressed or implied, is limited to a guarantee of the composition as shown on this label in as much as uses are beyond the seller’s control. For the same reason, the seller is not liable for any injury to any living thing, crops, soils, or materials which may result from the use or storage of this material. As this is largely a mineral-based fertiliser made from natural resources, the analysis may change slightly.

NOTE: not compatible with iron-based products

(SWS10L)

Product Application

APPLICATION RATE:

General: 100ml/100m2

Download Application Rates Document

Description Frequency
General Plants (indoor & out): 2.0ml Every 3-4 weeks
Vegetables & Annuals: 2.5ml Weekly
Established Lawns: 8.0ml Every 2-4 weeks
New Lawns: 5.0ml Weekly
New/transplanted Plants: 2.0ml Weekly
Trees: 8.0ml Every 4 weeks

Can be applied to the soil or foliar, if applying to foliage, check for staining prior, if concerned.


APPLICATION RATES

Shake well before use.

Application Type Rate & Application
HOME GARDENER
  • 1ml per 1sqm
  • 100ml per 100sqm
  • Apply fortnightly or as required.
BROADACRE
  • 6 - 10 Litres per hectare in enough water to provide thorough coverage or 1000 litres of water, reapplying 2-6 times during the growing season. It may be water run, side dressed, mixed with soil applied with liquid nutrients, or sprayed directly on the soil.

  • With Nutrients:
  • Add 2-4 litres per hectare mixed with the liquid nutrients. Add to a partially filled tank. Include with every application.
SPRINKLER OR DRIP IRRIGATION
  • Smaller amounts may be applied in every irrigation instead of only one application.
  • Not corrosive to pipes or nozzles and will not plug them.
TRANSPLANTING OR CUTTING
  • Mix 4 litres per 750 litres of solution.
  • Mix well before use.
AGRICULTURAL SPECIFIC RECOMMENDATIONS
  • Vegetables: 600ml per 100L water, apply every 2 weeks or as required.
  • Orchards & Vineyards: 600ml per 100L water, apply every 4 weeks or as required.
  • Ornamentals & Turf: 600ml per 100L water, apply every 4 weeks or as required.
  • Pasture: 1-3L/ha in 60-100L water, apply as required.
  • Broadacre Crops: 0.6-2L/ha in 60-100L water, apply as required, depending on canopy closure.
  • Spot-Spraying: 35ml per 10L water, apply as required.
FERTIGATION
  • Vegetables: 6 - 10L/ha, apply every 2 weeks or as required.
  • Orchards, Vineyards, Ornamentals & Turf: 6 - 10L/ha, apply every 4 weeks or as required.
APPLICATION RATE
  • General Plants (indoor & out): 2.0ml every 3-4 weeks
  • Vegetables & Annuals: 2.5ml weekly
  • Established Lawns: 8.0ml every 2-4 weeks
  • New Lawns: 5.0ml weekly
  • New/transplanted Plants: 2.0ml weekly
  • Trees: 8.0ml every 4 weeks

Note: Can be applied to the soil or foliar, if applying to foliage, check for staining prior, if concerned

Popular Questions

Question: How soon after spraying Seaweed Secrets can I mow?

Answer: It’s best to give your lawn 8-12 hours after application before you mow. The longer you leave it, the better.

 

Question: Should I mow my lawn before or after application?

Answer: It’s best to apply after mowing.

 

Question: How often should I apply this product?

Answer: Seaweed Secrets should be applied every 2-4 weeks or weekly if required.

 

Question: How much of this product should I apply?

Answer: The standard application rate is 75-100ml for every 100m2.

 

Question: Which method of application is better for applying Seaweed Secrets? Hortex sprayer or backpack sprayer?

Answer: Either way is sufficient, it comes down to preference. If applying with a backpack or pressure sprayer, it’s best to water-in. If applying with a Hortex, there’s no need to water-in.

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Amount of Reviews: 19

Not fit for purpose

By: David on 9 March 2025
It doesn't matter how good the product is, the container it comes in is unusable. I ended up using a drill and transferred half the product into an old Bunnings Seasol container. At least I can get the product out of the Seasol container. I am sick of the dumb stuff and this item is not fit for purpose. Just Rubbish! And the fact that the other reviewers don't mention this is highly suspicious

Super Happy

By: Kevin on 18 January 2025
Been super happy with this purchase, applyed this with the Plant Doctor soil wetter as well and my lawn is thriving!

Lawn & Vege Garden seem to be loving it!

By: Jeremy on 21 October 2024
Been using this now for a few months on the lawn and vege garden and everything is growing healthy and looking great!

Better than seasol

By: Lucas on 2 July 2024
Has more beneficial ingredients and is more affordable compared to seasol!

Seaweed Secrets

By: Bruce on 29 June 2024
I have used this product in combination with 5 other Plant Doctor products for the past four years and my Sir Walter lawns are pretty spectacular. The service and delivery are both prompt and efficient.

Great Kelp solution

By: Adam on 18 June 2024
I use this on both my garden and lawn. Great value for money

Great products

By: Jason on 17 February 2024
I have been using seaweed secrets as part of a mix for 12 months and the results are fantastic. Nice healthy lawn with great root depth.

Great product and value

By: Brett on 29 January 2024
I purchased the 10L product as it represents great value. Now after using the product for a month on my turf, indoor and outdoor plants I am super impressed by the results. I combined with Quantum H and Stimulizer. Will 100% be buying more and recommending Plant Doctor to my friends and family.

Awesome product

By: Jordan on 25 January 2024
This really is one of the best products out there

Seaweed Secrets

By: Andrew on 9 January 2024
Unbelievable results. Noticeable change with a few days. After using this product for a few years now on multiple lawn types this is far superior to others on the market

This stuff works!

By: Steve on 23 November 2023
I bought a 5L not long ago and now back for the 10L. Returning customers could only mean one thing. Good products

Seaweed secrets

By: Jack on 11 November 2023
Great product

Very happy

By: Chris on 28 October 2023
Very happy with my seaweed secrets purchase from Plant Doctor.

Top Quality

By: Justin on 25 October 2023
I've been using Plant Doctor liquid fertilizers for some time now, and I can't fault them. They are of a high quality, and make my lawn look exceptional. Seaweed secrets is a must for both lawns and gardens.

A little goes so a long way

By: Anthony on 14 October 2023
Great product, low odor compared to other similar products and a small amount goes so far.

Seaweed Secrets

By: Sharon on 13 October 2023
This is an amazing base for ALL my fertilising. I use it on everything. It really if fantastic

Seaweed No Secret

By: Timothy on 8 September 2023
Been using Seaweed Secrets for a while now. Helps the lawn recover when it's in stress. Seasol is ok, but when you do the maths, Seaweed Secrets is way better value for money, covering more m2, plus it has all that extra organic goodness included.

Excellent Product

By: Bradley on 31 August 2023
Far better results than the brands you get at Bunnings

Great product

By: David on 27 August 2023
Using the seaweed secrets combined with Activ8mate makes a big difference

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Australian Owned

Australian Owned

Australian family owned and operated. Online sales since 2009.

Flat Rate Shipping

Flat Rate Shipping

Flat-rate shipping from $9.95* Fast and affordable! *For items 1 kilo or less, shipped within Australia. $14.95 for above 1kg. Excludes some regional areas.

*For items 1 kilo or less shipped within Australia.

Same Day Dispatch

Same Day Dispatch

Same day dispatch Australia wide for orders received before midday*

*Monday - Friday (Excludes Public Holidays)

Customer Reviews

5

First time owning lawn. Gave the team at plant doctor a ring and they supplied me with a wealth of information. Products turned up quickly.

Billy Green

5

Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.

Michael Preddy

5

Only have great things to say about Plant Doctor. Organic products and a competitive price, fast shipping and easy to contact with questions. Have had great results with the special mix for lawns, and my plants (indoor and outdoor) love the seaweed secrets. I am excited to test out some of the animal products soon!

Tim McAuliffe

Plant Doctor

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