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  • Activ8EXTRA Boosted Liquid Fertiliser - 4L
Activ8EXTRA Boosted Liquid Fertiliser - 4L

Activ8EXTRA Boosted Liquid Fertiliser - 4L

NPK: 16-2-5 + Trace elements

Activ8EXTRA Boosted Liquid Fertiliser - 4L
$62.95
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Product Description

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.

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:

N
Nitrogen
16%
P
Phosphorus
2%
K
Potassium
5%
  • NPK: 26-2-5 + micronutrients
  • Fish hydrolysate, providing amino acids and natural growth enhancers
  • Blood & bone, for a balanced release of nitrogen and phosphorus
  • 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

 

 

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 & Acreage
(Broadacre, pastures, orchards, vineyards)
  • 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 is formulated as a high-analysis nutrient input combined with biological stimulants to improve nutrient use efficiency (NUE), soil structure, and rhizosphere performance. By integrating fast-available nitrogen with organic carbon sources and fulvates, it supports both immediate plant uptake and enhanced nutrient mobility within the root zone.

The formulation promotes microbial activity responsible for nutrient mineralisation, helping convert unavailable nutrients into plant-accessible forms while improving overall soil biological function. This increased activity contributes to better soil aggregation, aeration, and water infiltration, reducing compaction and improving root zone conditions. In addition, fulvic compounds enhance nutrient chelation and transport, improving uptake efficiency and reducing losses through leaching. The result is more stable nutrient availability within the rhizosphere, supporting consistent vegetative growth, improved canopy development, and faster recovery from stress.

Suitable for integration into fertigation, foliar, and soil-applied programs, Activ8EXTRA is particularly effective where rapid nitrogen response is required alongside improvements in soil biology and nutrient efficiency. Performance will vary depending on soil type, organic matter levels, and environmental conditions

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

(A8X04L)

Product Application

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.

 

 

Need Help with Application Rates?

Not sure how much to apply for your lawn or garden area? Use our Plant Doctor Product Rates Calculator to get the correct rate tailored to your size and conditions.

Open Application Rate Calculator

 

Popular Questions

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.

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Amount of Reviews: 5

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.

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.

give it the extra boot

By: David on 3 August 2023
This stuff is amazing. You will not be disappointed.

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.
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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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