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 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 phosphorus-sensitive natives unless tested first.

Should I mow before or after applying Activ8EXTRA?

Apply after 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, blood and bone, 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 | Lawn & Plant Inoculant

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, blood & bone, 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.

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

Who It’s For & How to Use It:

Lawns (Buffalo, Couch, Kikuyu & More)

Ideal during active growing seasons or after renovation
Helps turf bounce back from compaction, poor soil, or nutrient stress
Apply every 2–4 weeks via watering can, sprayer, or hose-on

Gardens (Veggies, Flowers, Trees, Pots)

Great for leafy greens and nitrogen-loving plants
Enhances root growth and plant resilience
Helps restore tired soils after heavy harvesting or chemical use
Mix with water and apply to soil or as a foliar feed

Farms & Larger Properties

Supports early-stage plant growth and canopy development
Improves nutrient efficiency and reduces input waste
Beneficial for turf farms, nurseries, orchards, and vineyards
Suitable for fertigation, boom spray, or soil injection systems

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.

The Science Behind Activ8EXTRA

Activ8EXTRA isn’t just high in nutrients, it’s formulated to work with nature, not against it. By combining synthetic NPK fertilisers with organic biostimulants, it supports a more biologically active soil environment.

Organic Carbon & Fulvates – Improve nutrient mobility and uptake in plant roots
Microbial Activation – Feeds beneficial bacteria and fungi that unlock bound nutrients
Soil Structure Boost – Promotes better water penetration, reducing runoff and compaction
Nitrogen Delivery – High nitrogen content supports lush, green vegetative growth
Nutrient Stability – Helps keep nutrients available longer in the rhizosphere
Salt Buffering – Reduces stress in soils with high salt content or previous synthetic overuse

Nitrogen

16%

Phosphorus

Potassium

Product Summary:	Details
Form	Liquid Concentrate
Use Cases	Lawns, Gardens, Trees, Commercial Green Spaces
Application	Soil drench, foliar spray, fertigation, hose-on
Compatibility	Do not use with iron-based products
Origin	Made in Australia

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.

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

General Application Rate:

For best results, apply fortnightly during the warmer months. During cooler months, apply less often and/or at lower strength. Best applied all-year round to continue improving soil and feeding microbes.

75-100ml/100sqm – 7.5-10L per Ha

20-30ml (1-2 capfuls) per 9L watering can

Agitate well before use.

As there are many conditions that affect the exact amount needed and the frequency of application for each product, there is no one-size-fits-all solution.

Several Ways Our Liquids Can Be Applied:

Application Method	Instructions
Watering Can	Mix the amount suggested (typically 10‐30ml) per 9 litres of water. 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.

Application Method

Instructions

Watering Can

Mix the amount suggested (typically 10‐30ml) per 9 litres of water. 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.

Activ8EXTRA

By: Julius on 4 April 2025

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

Fantastic

By: Brad on 21 November 2024

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.

Activ8 Extra

By: Bryce on 10 November 2024

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

working a treat

By: Jeremy on 21 October 2024

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

By: Justin on 24 September 2024

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.

Fantastic for pretty much everything

By: Dario on 7 May 2024

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

Activ8EXTRA Boosted liquid fertiliser

By: Adam on 11 March 2024

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

LUSH AND GREEN

By: Tanya on 6 February 2024

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.

By: Andrew on 9 January 2024

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

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

Love it.

By: Edwin on 18 October 2023

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

Great product

By: David on 27 August 2023

Very impressed, going to buy another 10 litres

give it the extra boot

By: David on 3 August 2023

This stuff is amazing. You will not be disappointed.

Amazing

By: Samuel on 10 January 2023

Great product once again

Giving the grass some love.

By: Stephen on 20 December 2022

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.

5 star praise

By: dion on 27 September 2022

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

Great adjunct liquid

By: Andrew on 11 February 2022

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.

Great value !!

By: Vincent on 20 January 2022

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.

Easy to use and cost effective

By: Nick on 23 December 2021

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

By: Lisa on 7 September 2021

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.

Results boosted

By: Tim on 23 August 2021

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.

Grow baby!

By: BRETT on 12 August 2021

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

By: john on 7 July 2021

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

Bang for buck

By: Steve on 2 July 2021

A great product from a great team.

Top quality - Super green

By: Christopher on 16 June 2021

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.

Works all the time!

By: Shoua on 4 June 2021

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!

Converted

By: Jon on 2 June 2021

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

Can notice the difference

By: Alana on 13 May 2021

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

Big Help with my Reno

By: Nathan on 28 December 2020

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

A great Liquid Fertiliser

By: Chris on 12 November 2020

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.

By: Troy on 15 October 2020

Use this on my hedges and grass with excellent results

Amazing product

By: Neeraj on 4 September 2020

Got it in Ben Sims pack. Amazing product

Amazing results.

By: Brandon on 23 July 2020

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

By: Stephen on 24 June 2020

Active8mate is very good, this one is even better!

Fantastic Results

By: Craig on 15 June 2020

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

By: Mark on 15 June 2020

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!

Bit extra for the lawn

By: Shannon on 11 June 2020

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

Thick Turf

By: ASHLEY on 9 June 2020

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.

This stuff is great

By: Steven on 29 February 2020

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

Really works!

By: anthony on 23 December 2019

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.

The boost you need!

By: Rhys on 10 November 2019

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!

Activ8EXTRA Boosted Liquid Fertiliser - 1L

NPK: 16-2-5 + Trace elements

Notify me when back in stock

Product Description