Seaweed Secrets | Concentrated Liquid Seaweed (Kelp) for plants and lawns | Super-Boosted with Humic & Fulvic Acid - 1L

Seaweed Secrets | Concentrated Liquid Seaweed (Kelp) for plants and lawns | Super-Boosted with Humic & Fulvic Acid - 1L

Use much less per square metre than leading brands

Seaweed Secrets is a concentrated liquid seaweed fertiliser and soil conditioner enriched with humic and fulvic acids. It promotes stronger roots, healthier growth, improved nutrient uptake and greater resilience to environmental stress for lawns, gardens
Seaweed + Humic + Fulvic Biostimulant Improves Stress Resistance & Root Growth Fixes Plant Stress & Slow Recovery
LawnsGardensFarms
$17.95
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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.

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.

Moved from more expensive products to seaweed secrets and getting the same results. Great value and ease of use is a bonus.
— Jason

Why choose Seaweed Secrets:

  • 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 

Nutrient Profile: 

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

 

  • Contains naturally derived macro, secondary & trace elements
  • Rich in kelp-derived bioactive compounds and plant growth stimulants
  • Designed to enhance nutrient uptake and plant performance, not replace fertiliser 

 

 

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.

(SWS01L)

Features

Benefits of using Seaweed Secrets on your lawn and garden:

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. 

Specifications

How it Works

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 pesticide

Application

  Specific Use Rate Frequency Notes
General: Lawn and Garden: 100ml/100m2    
Home Gardener: General: 1ml per 1sqm
100ml per 100sqm		 Apply fortnightly or as required.  
Broadacre: General:

6 - 10 Litres per hectare in enough water to provide thorough coverage or 1000 litres of water,

With Nutrients: Add 2-4 litres per hectare mixed with the liquid nutrients. Add to a partially filled tank. Include with every application.

 Reapply 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.
Sprinkler or Drip Irrigation: General:

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: General 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.  
General Plants Indoor and Outdoor 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. 

Download Application Rates Document

 

Safety

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

FAQ

How soon after spraying Seaweed Secrets can I mow?

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

Should I mow my lawn before or after application?

It’s best to apply after mowing for maximum leaf absorption.

How often should I apply this product?

Seaweed Secrets should be applied every 2–4 weeks, or weekly if required during periods of stress or active growth.

How much of this product should I apply?

The standard application rate is 75–100ml per 100m², diluted in water.

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

Either is effective. For backpack or pressure sprayers, water-in lightly. With a Hortex, watering-in isn’t necessary as it’s done simultaneously.

Can I use Seaweed Secrets on all lawn types?

Yes, Seaweed Secrets is safe for all Australian lawn types including buffalo, couch, kikuyu, and zoysia.

What does Seaweed Secrets do for my lawn or garden?

It enhances root growth, improves drought and stress resistance, stimulates beneficial microbes, and promotes greener, more resilient turf and plants.

Can I use Seaweed Secrets in summer?

Yes, Seaweed Secrets is ideal during hot weather as it helps reduce stress, improve water retention, and boost plant resilience.

Is Seaweed Secrets organic?

It is made from cold-processed Ascophyllum nodosum seaweed, sustainably harvested and naturally processed. While not certified organic, it’s a natural bio-stimulant.

Can I combine Seaweed Secrets with other fertilisers?

Yes, it’s highly compatible with most fertilisers and soil conditioners, including Activ8EXTRA, Quantum H, and Stimulizer. Always jar-test if unsure.

Is Seaweed Secrets safe for pets and kids?

Yes, once the product has dried after application, it’s safe for children and pets to access treated areas.

Reviews

5.0 / 5

customer reviews

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Seaweed Secrets..

Very impressed with this product so much so that I bought a 5 litre bottle. The results are just amazing after using it to water my seedlings regularly. They are very healthy and have fattened up. I would call this stuff liquid gold.. well done plant doctor, I look forward to purchasing more of your products..

The best

Really happy with this seaweed solution. Have used it for spring and summer and my lawn and garden hasn't looked better. I've used so many of the other brands but will be sticking with plant dr now. Purchasing the 10L is great value.

Has made a huge difference to the lawn in such a s

WOW! The lawn really greened up in a short time from this. Simply amazing.

Great Stress Relief

Have been using kelp products for a while and this in combo with Soil Wetter provides some great stress relief in the summer heat

Good seaweed product

Good seaweed products very good value as well

The Best Seaweed Product On The Market

As my title says, This is by far the best seaweed product on the market, Been Using it for over a year now and have been extreamly happy with it!

Lazy-proof

The dosing bottle makes this so easy to use that I find myself remembering to use it more often. Herbs, vegetables, fruit trees, flowers, root bound seedlings that I optimistically started when I don't have room to plant them out - everything gets a dose of this with activ8 and loves it.

Great value

Moved from more expensive products to seaweed secrets and getting the same results. Great value and ease of use is a bonus.

Seaweed secrets

This seaweed secrets product does work wonderfully well for all plants and lawns you only need to use what the instructions say and it keeps your plants and gardens safe and healthy from disease and pests just what the good doctor ordered.Thank you Plant Doctor

Not fit for purpose

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

Been super happy with this purchase, applyed this with the Plant Doctor soil wetter as well and my lawn is thriving!

Another high quality product

I brought this to give my lawn a kick start during spring. It's a great product that's easy to apply and mixes well with the other products in the plant doctor range.

Awesome product

Been using the seaweed secrets for 12 months now and have just placed a 2nd order and my lawn has never looked better. Keep up the great work guys!

Seaweed secrets

Really love the product, lawn is looking really good and showing signs of improved health in troubled areas!! Would absolutely recommend.

Lawn & Vege Garden seem to be loving it!

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

Has more beneficial ingredients and is more affordable compared to seasol!

Seaweed Secrets

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

I use this on both my garden and lawn. Great value for money

Outstanding service and fast shipping for an even

First time using Plant Dr’s Seaweed Secrets and couldn’t be happier with the results. I’ll be back for more!!

Great products

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.

LUSH AND GREEN

Love this product, made my new lawn from light green to a bright vibrant green in only two applications! Highly recommend. Purchased as part of the Lawn Lovers Pro Pack.

Great product and value

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

This really is one of the best products out there

Great product! Good results

Very happy

Seaweed Secrets

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

Loving this product

I have only done one application of this product so far and I am already impressed with the results, a bonus is that this product does not leave a seaweed smell

This stuff works!

I bought a 5L not long ago and now back for the 10L. Returning customers could only mean one thing. Good products

Seaweed secrets

Excellent product definitely recommend to anyone looking for a great seaweed product

Seaweed secrets

Great product

Very happy

Very happy with my seaweed secrets purchase from Plant Doctor.

Top Quality

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

Great product, low odor compared to other similar products and a small amount goes so far.

Seaweed Secrets

This is an amazing base for ALL my fertilising. I use it on everything. It really if fantastic

Seaweed No Secret

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

Far better results than the brands you get at Bunnings

Great product

Using the seaweed secrets combined with Activ8mate makes a big difference

better than the green shed

you can buy a similar product from your local hardware store... but for value and quality of product you can't beat Seaweed Secrets!

Amazing

Amazing product, have seen amazing results after the first application.

Great product

Recently purchased this along with a few other products. In the few weeks I have been using it my lawn has noticeably looked healthier. The fact that you use a lot less than other products for better results shows the great value. Very happy with it

Best Seaweed in Town

My plants are always happy since I have given regular seaweeds secret. I am keeping this as my secret. I bought 20L because I am anxious about running out.

Seaweed Secrets

I’ve been using this product for over a year on my lawn, garden and potted plants on a fortnightly/monthly basis and any plants I transplant or Re-pot to stop transplant shock. The natural sandy soil in my garden and lawn is getting darker and water holding ability improving. The CEC is also improving and fertiliser lasting longer. I am an independent agronomist and highly recommend this product.

Yet again another prompt delivery

Yet again another prompt delivery for my Seaweed Secrets for the year. Already just applied it as Autumn hits and can't wait to have this product get me through winter again to spring. Great value for money also when you get the 20lt drum

Great stuff

Like seasol but better the fact it takes less than 200mL to do my 180M2 of turf is awesome and keeps great colour and condition to my lawn keeps it lush and healthy looking. Once it runs out I'll definitely be buying more love the stuff

Great Product!

I use Seaweed secrets in my EzFlo Fertigation system and my turf responds really well. Will keep on using year round! Highly recommend!

Best

Best seaweed product on the market to date

It’s a must for me

I cant have enough of it. My potted plants look healthier and stronger now

Should Have Changed Ages Ago

Seaweed secrets is an amazing product. After only two sprays over a 10 day period my santa ana lawn is looking the best it ever has...I kid you not! I have persevered with other highly recommended products and thought they were good...but this stuff is the Best!!! Do yourself a favour and get to the Doctor now!!!

Great Product

Excellent results on my Kik in SEQ, very quick postage and great communication, highly recommend

Brilliant all round Product

The go to Product for all my gardening needs. My Alocasias can’t get enough of this product…. My veggies love it too, aswell as my collectible plants….. and it doesn’t burn sensitive leaves like others on the market!

5 star praise

First time taking on a lawn reno and with help and guidance from the plant doctor my lawn is looking amazing. This stuff is so easy to use with simple application instructions right there on the bottle you will get results in no time at the fraction of the price

Warranty

90 Day Money Back Guarantee

Shop with confidence knowing your purchase is backed by our 100% 90-day money back guarantee. If you're not completely satisfied, simply contact us within 90 days for a refund.

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5.0 / 5

Customer reviews

customer reviews

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Seaweed Secrets..

Don

Very impressed with this product so much so that I bought a 5 litre bottle. The results are just amazing after using it to water my seedlings regularly. They are very healthy and have fattened up. I would call this stuff liquid gold.. well done plant doctor, I look forward to purchasing more of your products..

The best

Luke

Really happy with this seaweed solution. Have used it for spring and summer and my lawn and garden hasn't looked better. I've used so many of the other brands but will be sticking with plant dr now. Purchasing the 10L is great value.

Has made a huge difference to the lawn in such a s

Craig

WOW! The lawn really greened up in a short time from this. Simply amazing.
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Australian family owned and operated. Online sales since 2009.

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Flat-rate shipping from $9.95* Fast and affordable!

$9.95 orders under 1kg/1L • $14.95 orders up to 50kg • $49.95 orders over 50kg. Does not include express. Some location exclusions apply.
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Customer Reviews

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.

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

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!

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