What is Activ8EXTRA used for?

Activ8EXTRA is a high-nitrogen liquid fertiliser enriched with organic ingredients like seaweed, fish, humates, and blood and bone. It's designed to feed lawns, leafy plants, and trees while improving soil structure and microbial health.

What’s the difference between Activ8MATE and Activ8EXTRA?

Both are biologically enhanced liquid fertilisers, but Activ8EXTRA is higher in nitrogen and better suited for vigorous growth in lawns and leafy plants. Activ8MATE has a broader nutritional profile for general soil and plant health, especially during seasonal transitions or when microbial activity needs a boost.

How often should I apply Activ8EXTRA?

Apply every 2–4 weeks during the active growing season. For best results, pair with watering or rain to move nutrients into the soil.

How much Activ8EXTRA should I use?

Apply 1ml per 1sqm or 75–100ml per 100sqm, diluted in water. Always trial on a small section before widespread use, especially with new application rates.

Can I use Activ8EXTRA on all lawn types?

Yes, it's suitable for all Australian lawn varieties, including buffalo, couch, kikuyu, and zoysia.

Is Activ8EXTRA safe for all plants?

Yes, it can be used on lawns, leafy green plants, trees, and shrubs. Avoid use on sensitive, young or native plants unless tested first.

Should I mow before or after applying Activ8EXTRA?

Apply before mowing for optimal absorption and to prevent product removal through clipping.

Do I need to water in Activ8EXTRA?

Yes, a light watering after application helps deliver nutrients to the root zone and activates soil biology.

Can I mix Activ8EXTRA with other products?

Yes, but avoid mixing with iron-based products as they may be incompatible. Always jar test before combining products in a tank.

Is Activ8EXTRA pet- and child-safe?

Yes, once dry. Keep children and pets off treated areas until the product has fully dried to avoid contact with active ingredients.

What are the key ingredients in Activ8EXTRA?

Activ8EXTRA contains nitrogen, phosphorus, potassium, trace elements, seaweed, fish, and high-quality humates including fulvic acid.

Can I use Activ8EXTRA during hot weather?

Yes, but apply early morning or late afternoon and avoid high-heat periods. Always water in well to prevent plant stress.

Activ8EXTRA Boosted liquid fertiliser and inoculant for lawns and leafy plants

Activ8EXTRA Boosted Liquid Fertiliser - 4L

High-Nitrogen Liquid Fertiliser & Soil Conditioner

High-nitrogen liquid fertiliser and soil conditioner enriched with seaweed, fish, blood and bone, plus humic and fulvic acids. It promotes lush green growth, improves soil health, feeds beneficial microbes and enhances nutrient availability.

16-2-5 NPK + T/E & Seaweed Fast Green-Up & Growth Fixes Yellow, Weak Lawns

Lawns Gardens Farms

Boosted Liquid Fertiliser for Lawns, Plants & Soil Health

High-Performance Liquid Fertiliser to Feed Your Lawn and Revive Your Soil

Activ8EXTRA is more than just a fertiliser, it’s a biologically boosted blend designed to feed both your plants and your soil. Infused with organic ingredients like seaweed, fish and fulvic acid, it delivers fast-acting nitrogen along with the natural compounds your soil microbes crave. Whether you’re growing a lush lawn, thriving veggie patch, or leafy trees, Activ8EXTRA helps you build healthier soil and deliver greener, stronger growth, all in one easy liquid application.

Use Activ8EXTRA when your lawn or soil needs a nitrogen boost, improved biology, better water absorption, recovery after chemical use, or preparation for planting as part of an organic or regenerative program.

I started using this about a week ago after adding Nature's Soil wetter to my lawn. Wow..... What a difference it makes. My grass in responding so quickly. Before it was hard to get it to do anything. This stuff is like gold in a bottle. I had some dead and dying areas of grass but now they are lush, green and filling in again.

— Stephen

Why Choose Activ8EXTRA:

Strong leaf growth with high nitrogen
Feeds and activates beneficial soil microbes
Improves soil aeration and water penetration
Enhances nutrient uptake and micronutrient availability
Reduces fertiliser leaching and locks nutrients in the root zone
Made with fish, kelp, humates, blood & bone, and fulvic acid
Works across lawns, garden beds, trees, and vegetables

Nutrient Profile:

Nitrogen

16%

Phosphorus

Potassium

Feed Your Lawn & Soil the Right Way. Activ8EXTRA gives your lawn and garden the nutrients they need and builds the soil biology to sustain long-term growth. Whether you’re a weekend gardener or managing large-scale turf, this all-in-one fertiliser helps your landscape flourish, from the soil up.

Type	Application Rate
Minimum dilution rate:	1:100	Apply fortnightly or when feeding is required
General application:	75-100ml/100sqm 7.5-10L per Ha
Watering Can:	20-30ml/9L *Spread evenly across the area to fertilise.
Hose‐on Bottle (Seasol/weed ‘n feed etc.) or Hortex Sprayer	Mix the minimum amount of water with the product/s to allow you to cover the required area/s. _{For example, for my front yard, using an old weed n feed hose‐on bottle, I add 100ml of each Seaweed Secrets, Activ8mate or Activ8EXTRA, and Nature's Soil Wetter, then top up with enough water to allow you to evenly cover it using the hose‐on bottle (I add about 600ml water), then evenly hose‐on.}
Pressure/Knapsack Sprayer	You need about 15 litres (a little more or less won’t hurt) of water to be applied per 100m², so take that into consideration when applying. If you have a smaller sprayer, either do several smaller applications (i.e., covering 50m² at a time and repeat until the entire area is covered), or over a larger area spray with the required amount. If you haven’t used 15 litres/100m², give a light water‐in. If using a Hortex sprayer on setting 2 without the restrictor, you shouldn’t need to add water, but if you do, just add as little amount to cover the required area.

Type

Application Rate

Minimum dilution rate:

1:100

Apply fortnightly or when feeding is required

General application:

75-100ml/100sqm

7.5-10L per Ha

Watering Can:

20-30ml/9L

*Spread evenly across the area to fertilise.

Hose‐on Bottle (Seasol/weed ‘n feed etc.) or Hortex Sprayer

Mix the minimum amount of water with the product/s to allow you to cover the required area/s.

_{For example, for my front yard, using an old weed n feed hose‐on bottle, I add 100ml of each Seaweed Secrets, Activ8mate or Activ8EXTRA, and Nature's Soil Wetter, then top up with enough water to allow you to evenly cover it using the hose‐on bottle (I add about 600ml water), then evenly hose‐on.}

Pressure/Knapsack Sprayer

You need about 15 litres (a little more or less won’t hurt) of water to be applied per 100m², so take that into consideration when applying. If you have a smaller sprayer, either do several smaller applications (i.e., covering 50m² at a time and repeat until the entire area is covered), or over a larger area spray with the required amount. If you haven’t used 15 litres/100m², give a light water‐in. If using a Hortex sprayer on setting 2 without the restrictor, you shouldn’t need to add water, but if you do, just add as little amount to cover the required area.

10 December 2025

So easy

Conor

Everything in the one bottle. brings my lawn back to life.

4 April 2025

Activ8EXTRA

Julius

Just a very nice fertiliser for all plants and lawns for a nice little boost.Thanks Plant Doctor

21 November 2024

Fantastic

Tom

I was recommended this by a friend to supplement my application of slow-release granular fertiliser. This liquid product is much faster acting and easier to apply. Highly recommend.

10 November 2024

Activ8 Extra

Bryce

Recently decided I would do more to look after my lawn, to help me achieve what I wanted this product has not only sped up the process but I’ve now got a really healthy lawn!! Highly recommend

21 October 2024

working a treat

Jeremy

in combo with a range of plantdoctor products my lawn is going great!

24 September 2024

Justin

Another great product from the team at Plant Doctor. Was drawn to this company as they have a strong background in horticulture/agriculture products where it is important to provide effective and efficient use of products. Backed by science, their products are easy to use with lower application rates avoiding unnecessary overuse of products.

7 May 2024

Fantastic for pretty much everything

Dario

I’ve used this product on pretty much everything on my garden and seems to be doing a fantastic job.

11 March 2024

Activ8EXTRA Boosted liquid fertiliser

Adam

Decided to go for a liquid fertiliser instead of the standard granular and it didn't disappoint.

6 February 2024

LUSH AND GREEN

Tanya

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.

9 January 2024

Andrew

Nothing compares to this product. Especially now during growing season. Grass and plants have never looked better and stay healthy for longer.

25 October 2023

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. I used Activ8 previously, and this new EXTRA seems to work even better!

18 October 2023

Love it.

Edwin

Seems to last forever with the dilution rate. Lawn loves it and plants love the overspray.

27 August 2023

Great product

David

Very impressed, going to buy another 10 litres

3 August 2023

give it the extra boot

This stuff is amazing. You will not be disappointed.

10 January 2023

Amazing

Samuel

Great product once again

20 December 2022

Giving the grass some love.

Stephen

27 September 2022

5 star praise

dion

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

11 February 2022

Great adjunct liquid

Added this into my foliar program for the 2021/22 season and have been happy with it. It’s great to have a turf product with a bit more P and K for foliar application.

20 January 2022

Great value !!

Vincent

This stuff works out way cheaper per 100m2 compared to the stuff you can get from the green shed. Works a treat. Lawn has never looked better. Free shipping with orders over $59 is the icing on the cake.

23 December 2021

Easy to use and cost effective

Nick

When used as per instructions adds excellent growth to all plants and lawns highly recommended

7 September 2021

Lisa

I purchased this product for our Sit Walter lawn as wanted the grass to look more lush. The product worked almost overnight. This is definitely the go to product to use to put the greeness back into the grass.

23 August 2021

Results boosted

Tim

This is a boosted version of Activ8mate - I was happy with the original but if you want some more push with extra nitrogen then this is the one to get.

12 August 2021

Grow baby!

BRETT

This stuff is amazing on lawns beautiful Green and lush Nature at its best

7 July 2021

john

I feed this with the Seaweed Secrets to my lawn and plants and have gotten great results. Very economical as well. Great stuff.

2 July 2021

Bang for buck

Steve

A great product from a great team.

16 June 2021

Top quality - Super green

Christopher

Top quality liquid fertilizer, produces a really nice green colour in your lawn. Supplemented by the liquid iron product - contains a safe proportion of nitrogen so you wont burn your lawn, you wont be disappointed with this product.

4 June 2021

Works all the time!

Shoua

This is my 'go-to' liquid lawn fertilizer that I use every month to keep my lawn in 'tip-top' shape! It's a well rounded fertilizer that can also be used on plants and trees and extremely beneficial during Winter given that granules don't do a good job in the colder weather. Highly recommend for all lawn lovers and rest assured Activ8EXTRA will differentiate a great lawn from a good one!

2 June 2021

Converted

Jon

I use to always use seasol on my lawn, since being told about Activ8extra I've been converted and so have my mates that I've told

13 May 2021

Can notice the difference

Alana

Great product, can definitely recommend this as I can see larger leaf size and faster growth on my indoor plants.

28 December 2020

Big Help with my Reno

Nathan

Activ8 Extra has been a big help bringing my Buffalo back from this years Reno!

12 November 2020

A great Liquid Fertiliser

Chris

The results were fast and exceptional. Not only has it helped with growth but made the leaf seem stronger, encouraged root growth and has made the lawn one of the best in the street. Very happy customer.

15 October 2020

Troy

Use this on my hedges and grass with excellent results

4 September 2020

Amazing product

Neeraj

Got it in Ben Sims pack. Amazing product

23 July 2020

Amazing results.

Brandon

Got it in my Ben Sims pack. Absolutely stoked with the results

24 June 2020

Active8mate is very good, this one is even better!

15 June 2020

Fantastic Results

Craig

I have applied this product mixed with Plant Dr Humic Acid and Im seeing a noticeably healthier looking lawn. Plant Dr's service is second to none with a 2 day delivery free over $50, very happy customer

Great Liquid Fertiliser

Mark

Easy to apply product using a hortex sprayer and gave the yard a really good pop. I teamed this up with the granular fert, no issues and great colour. I get a lot of great comments from friends and family that turn up to the newly invigorated lawn!

11 June 2020

Bit extra for the lawn

Shannon

Loved the first active8mate, but this has a few extra goodies in it for that extra boost

9 June 2020

Thick Turf

ASHLEY

Since using this my turf has thickened up so well. It also has a very nice green colour to it. I have noticed I am not watering as much either.

29 February 2020

This stuff is great

Steven

Just started using this product and applying as it sais on label and im seeing great results with it.

23 December 2019

Really works!

anthony

I used this liquid fert during the recovery phase of my lawn renovation, and it really improved recovery time. Good for a rapid green up.

10 November 2019

The boost you need!

Rhys

In conjunction with my granular fertilizer, the boost of nitrogen really gives my grass the boost it needs

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.

Billy Green

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

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!

NPK:	16-2-5 + micronutrients
Additional Components:	Fish hydrolysate, providing amino acids and natural growth enhancers Seaweed (Ascophyllum nodosum), rich in cytokinins, auxins, and anti-stress compounds Humic and fulvic acids (USA-sourced), for increased nutrient chelation, improved soil CEC, and microbial stimulation A blend of trace elements that address common deficiencies in Australian soils

Activ8EXTRA Boosted Liquid Fertiliser - 4L

High-Nitrogen Liquid Fertiliser & Soil Conditioner

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