Great for mixed garden beds
"I have vegetables herbs and flowers growing together and this has been really convenient. Everything is looking healthy and I do not need separate feeds for every section."
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NPK 20-20-20 + trace elements
Liquid concentrate
All Purpose Plant Liquid FertiliserFormulated from NPK 20-20-20 & Micro Nutrients
High-strength 20-20-20 liquid fertiliser with essential trace elements. One feed for roots, foliage and steady growth.
- Balanced NPK nutrition for stronger roots, healthier foliage and sustained growth
- High-concentration liquid formula for powerful feeding in every application
- Enriched with iron, zinc, manganese and boron to support stronger plant performance
- Fast-absorbing and easy to use for consistent, visible results
- Versatile formula suitable for a wide range of plants
$28.90
$34.00
Save 15%
12¢
per litre
Choose select amount
“"I have vegetables herbs and flowers growing together and this has been really convenient. Everything is looking healthy and I do not need separate feeds for every section."”
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& manufactured
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From our growers
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Description
Formulated from NPK 20-20-20 with essential trace elements. Made from high-quality natural raw materials to give your whole garden stronger roots, healthier foliage and sustained growth.
Great for
Foliar & soil feed
General garden plants
Hedges & shrubs
Roses & flowering plants
Vegetables & herbs
Fruit trees
Indoor & potted plants
Climbers & ground covers
Why growers choose it
Powerful concentrate: high-strength liquid formula for effective feeding in every application.
Enriched with trace elements: iron, zinc, manganese and boron for stronger plant performance.
Fast-absorbing & easy to use: water it in or spray the leaves for consistent, visible results.
One feed, many plants: a versatile formula that replaces a shelf of different fertilisers.
A little goes a long way: just a small amount mixed with water makes litres of ready-to-use feed, so one bottle lasts for many feeds.
i
Gentle enough for delicate plants. Use at half strength for indoor plants, seedlings and other sensitive plants.
Gentle enough for delicate plants. Use at half strength for indoor plants, seedlings and other sensitive plants.
✓ Australian owned & manufactured
✓ High-quality raw materials
✓ High-quality raw materials
Guaranteed Analysis
Formulated from premium NPK 20-20-20 made from natural minerals, for a balanced 1:1:1 feed.
NPK analysis
Trace elements
How to mix & feed
Shake well, measure, then always dilute in water before applying.
1
Choose your mix
Choose your mix
Root FeedingWater evenly around the root zone, just like normal watering.
4mLper 1L water
Foliar SprayLightly mist the leaves morning or evening. Avoid hot, direct sun.
2mLper 1L water
Sensitive PlantsA gentler root feed for seedlings, cuttings, ferns and delicate indoor plants.
2mLper 1L water
2
How often to feed
How often to feed
Active Growth — Feed WeeklyApply once a week during active growth.
Dormant — Every Two WeeksApply once every two weeks during winter.
i
Every plant is different. Fast growers, veggies and potted plants may like feeding weekly, while slower growers and sensitive plants may only need it every 2–3 weeks. Adjust to suit your plant.
Every plant is different. Fast growers, veggies and potted plants may like feeding weekly, while slower growers and sensitive plants may only need it every 2–3 weeks. Adjust to suit your plant.
Faster for big gardens
Using the hose-end sprayer
Fill the bottle to 1 litre, attach to your hose and spray evenly around the root zone. Set the dial to A.
CompleteGrow fertiliser sprayer
Pick a strength for the bottle:
These bottle mixes are only for the CompleteGrow hose-end sprayer, which dilutes as you water.
FAQ
How much do I mix?
Mix 4 mL per litre of water. At that rate 1L makes 250L of ready-to-use feed, 4L makes 1,000L and 20L makes 5,000L.
How often should I feed?
Once a week during the growing season, and less often through the cooler months when growth slows.
Can I use it as a foliar spray?
Yes. It works as both a soil feed and a foliar feed. Spray leaves in the early morning or late afternoon, not in full sun.
Is it gentle enough for indoor plants and seedlings?
Yes. Use it at half strength for indoor plants, seedlings and other sensitive plants.
Can I use it with a hose-end sprayer?
Yes. It works with the CompleteGrow 1L Hose-End Fertiliser Sprayer for faster, even coverage across larger gardens.
What does it contain besides NPK?
Essential trace elements including iron, zinc, manganese and boron, for stronger overall plant performance.
When should I switch to Advanced Formula?
Use All Purpose while plants are growing leaves and stems. Switch to Advanced Formula 4-18-38 once plants start budding, flowering or fruiting.
Reviews
5.0
Based on 20 reviews
Growing something great?
Share a quick review and a photo of your garden — it really helps other gardeners.
100% rated it 4 stars or higher
Genuine reviews from CompleteGrow customers.
Customer photos
7
Noticeable difference
"Leaves look deeper green and growth is more even."
really handy fertiliser
"ive been using this on pretty much everything in the backyard. herbs flowers pot plants all of it. super easy and everything seems to be growing well"
Showing 3 of 20
Best For These Plants
Ideal for Herbs, Veggies & Indoor & Outdoor Plants
Supports Flowering & Fruiting Plants
How it Works
Mix 4ml per litre of water
Feed Your Plants
Watch Them Thrive
All Purpose Formula
One Fertiliser. Many Plant Types.
Indoor Plants
No-smell formula for easy indoor feeding.
Great for foliage plants that need balanced weekly feeding without the routine feeling messy or complicated indoors.
- Monstera
- Pothos
- Philodendron
- Peace Lily
See more indoor plants
Veggies & Herbs
Higher yields and faster growth for edible gardens.
A strong all-round choice for edible gardens, raised beds and herb pots that need dependable routine feeding.
- Tomato
- Chilli
- Basil
- Parsley
See more edible plants
Flowering Plants
Steady support for healthy colour and growth.
Ideal for ornamentals and flowering plants that benefit from a reliable all-round feeding routine.
- Roses
- Orchids
- Petunias
- Geraniums
See more flowering plants
Hedges & Shrubs
One versatile feed for everyday garden plants.
Suitable for hedges, shrubs, screening plants and mixed borders that need dense, even growth through the season.
- Buxus
- Murraya
- Lilly Pilly
- Photinia
See more hedges & shrubs
Fruit & Citrus
General support during active fruiting growth.
Useful when fruit trees need balanced feeding support for foliage, flowering and seasonal development.
- Lemon
- Lime
- Orange
- Mandarin
See more fruiting plants
Hydroponics
Fast-mixing nutrition for soilless systems.
Dissolves cleanly for water-based and soilless growing when used at the correct rate for your system.
- Lettuce
- Strawberries
- Herbs
- Leafy Greens
See more hydroponic plants
How Much to Mix
Simple Feeding. Better Growth.
Measure, mix with water and feed your plants.
1
Measure
Standard
4 mL/L
Half strength
2 mL/L
Foliar + sensitive plants
2
Mix
Water in or use our sprayer.
Make feeding even easier
Standard 4 mL/L
Sensitive 2 mL/L
Attach to your hose for fast, even feeding—no measuring cups.
Heavy
300 mL + 700 mL water
Medium
250 mL + 750 mL water
Light
150 mL + 850 mL water
3
Thrive
Complete nutrition.
Visible results within 7 days.
Quick Mixing Calculator
How Much to Mix
Enter how much water you are using.
Litres
Standard 4 mL/L · Half strength 2 mL/L
Add this much
Enter an amount
Your mixing amount will appear here.
Half strength
Foliar feeding
&
sensitive plants
—
Reviews From Our Gardener's
5.0
Based on 20 reviews
Growing something great?
Share a quick review and a photo of your garden — it really helps other gardeners.
100% rated it 4 stars or higher
Genuine reviews from CompleteGrow customers.
Customer photos
7
Great for mixed garden beds
"I have vegetables herbs and flowers growing together and this has been really convenient. Everything is looking healthy and I do not need separate feeds for every section."
Noticeable difference
"Leaves look deeper green and growth is more even."
really handy fertiliser
"ive been using this on pretty much everything in the backyard. herbs flowers pot plants all of it. super easy and everything seems to be growing well"
Showing 3 of 20
My chain of hearts have been giving me plenty of seeds lately so I thought I would have a go at growing some in Sphagnum Moss under grow lights and feeding them with @completegrow…. 9 weeks later I have healthy little babies 😍 @time__and__place.
This fertiliser has made a big difference to my hydrangeas. The plants look stronger, the leaves are a healthy deep green, and the blooms are bigger, fuller, and more vibrant. It mixes well and has been really easy to use. Especially with the sprayer, i no longer need to use a watering can.
Amy J
Verified Buyer
Concentrated NPK 20-20-20 Liquid Plant Nutrition
One Litre. Big Yield. Up to 500 Litres.
One litre makes up to 250 litres of plant feed at standard strength, or up to 500 litres when mixed at half strength for sensitive plants and light feeders.
High-Yield Liquid Concentrate
- Makes 250 litres at standard strength
- Makes 500 litres at half strength
- Fast-mixing liquid for indoor and outdoor plants
Up to 25 × 20-Litre Containers
Standard Rate
Standard Strength
250
Litres
From one 1 L bottle
4 mL per litre
Add 4 mL concentrate per 1 L of water
Sensitive Plants
500
Litres
From one 1 L bottle
2 mL per litre
Add 2 mL concentrate per 1 L of water
Makes up to 500 litres of feeding
Other sizes:
4 L makes up to 1,000 L and 20 L makes up to 5,000 L at standard strength.
See How We Stack Up
How Does CompleteGrow Compare?
The Gold Standard
CompleteGrow All-in-One
Super concentrated premium plant food- Pure Mineral Plant Nutrition Equal nitrogen, phosphorus & potassium
- Rich in Micronutrients + Trace Elements Includes iron, zinc, boron & more
- Double Strength Formula 1 L makes up to 250 L of prepared feed
- Australian Made Made locally by CompleteGrow
- Soil, Hydro & Foliar Multiple ways to feed your plants
- All Plants, Indoors & Outdoors One versatile formula for everyday growing
Common Alternative
Basic Store-Bought Fertiliser
A simple everyday feeding option- ✓ Can Support Everyday Plant Growth
-
Limited growth support
-
Weak NPK blends
- × Lacks essential plant vitamins
- × Less Concentrated per Bottle
-
Doesn't work for all plants
Common Alternative
Organic Feed
Organic backyard options-
Slow-release nutrients
- ✓ Often Chosen for Soil-Focused Feeding
-
Inconsistent nutrient NPK levels
-
Unpleasant Smell
- × Less Concentrated per Bottle
- × Won't save stressed plants
NPK 20-20-20 Liquid Fertiliser
CompleteGrow All Purpose Liquid Fertiliser is an Australian-made, concentrated plant food formulated from balanced NPK 20-20-20 source nutrients and essential trace elements. One easy formula feeds vegetables, herbs, flowers, orchids, indoor plants and outdoor gardens.
- Ideal for veggies, herbs, flowers, orchids & indoor plants
- Suitable for hydroponics, foliar feeding & soil application
- Weekly feeding for faster, healthier plant growth
- Includes iron, boron, zinc, manganese & more
-
Made in Australia with high-grade materials
Guaranteed Analysis
-
N
20
-
P
20
-
K
20
Essential Micronutrients
- Iron (Fe)
- 0.10%
- Manganese (Mn)
- 0.05%
- Boron (B)
- 0.02%
- Copper (Cu)
- 0.02%
- Zinc (Zn)
- 0.05%
- Molybdenum (Mo)
- 0.001%
What NPK 20-20-20 Means
A balanced, all-purpose fertilizer—also called 20-20-20 fertilizer or 20 20 20 fertilizer—supplying equal parts nitrogen (N), phosphorus (P) and potassium (K) for even vegetative growth, strong roots and steady flowering across vegetables, houseplants, ornamentals and lawns.
- Balanced nutrition: Equal N-P-K (20-20-20) supports leafy growth (N), rooting & bud set (P), and vigor & stress tolerance (K).
- All-purpose use: Great “all purpose fertilizer” for seedlings, transplants, herbs, greens, houseplants and ornamentals—ideal between bloom-booster cycles.
- Flexible formats: Works as a water-soluble powder or a ready-to-mix 20 20 20 fertilizer liquid for soil, coco or hydroponics.
Learn More About NPK 20-20-20
What does NPK 20-20-20 mean? NPK refers to the three primary plant nutrients: nitrogen (N), phosphorus (P) and potassium (K). The matching 20-20-20 numbers describe a balanced source ratio, meaning none of the three primary nutrients is intentionally favoured over the others. Refer to the product label for the finished liquid’s guaranteed analysis.
What each nutrient does
- Nitrogen (N) supports chlorophyll production, green foliage and new vegetative growth.
- Phosphorus (P) supports root development, energy transfer and the plant processes involved in flowering.
- Potassium (K) supports plant vigour, water regulation, nutrient movement and resilience during environmental stress.
Why use a balanced liquid fertiliser?
A balanced NPK fertiliser is useful when plants need broad, routine nutrition rather than a formula designed to strongly favour leafy growth, rooting or flowering. It is a practical all-purpose plant food for maintaining steady growth across different stages of plant development.
- Suitable, when used as directed, for vegetables, herbs, flowers, orchids, indoor plants, lawns and container gardens.
- Can be used in soil, pots, coco and hydroponic growing systems, with application adjusted for the plant and growing method.
- The liquid concentrate disperses quickly in water, making it easy to measure and prepare an evenly diluted nutrient solution.
More than NPK
CompleteGrow also contains six essential micronutrients: iron, manganese, boron, copper, zinc and molybdenum. Plants require these elements in much smaller quantities, but they still contribute to chlorophyll formation, enzyme activity and other processes required for healthy growth.
How to apply it
- Use 4 mL per litre for standard root-zone feeding.
- Use 2 mL per litre for half-strength feeding, sensitive plants or appropriate foliar application.
- Measure the concentrate against the final volume of diluted solution and mix thoroughly with water.
- Apply root-zone feed to moist growing media. Avoid applying fertiliser to extremely dry or waterlogged roots.
- Apply foliar feed during the cooler part of the day and avoid strong sunlight, extreme heat or visibly stressed plants.
When another formula may be more suitable
Plant requirements change with species, growth stage, water quality and growing conditions. A crop with a specific deficiency or specialised flowering requirement may need a different feeding program. Avoid adding calcium, magnesium or other supplements automatically—use them only when your water, growing system or plants indicate they are required.
Always follow the CompleteGrow product label and begin at half strength when feeding seedlings, sensitive plants or an unfamiliar variety.
Why Choose CompleteGrow NPK 20-20-20 Liquid Fertiliser?
A balanced, all-purpose liquid fertiliser that makes routine plant feeding simple. Each application supplies equal N-P-K source nutrition plus six essential micronutrients for gardens, pots, coco and hydroponic growing.
Balanced Nutrition from Root to Leaf
Nitrogen supports green growth, phosphorus supports roots and energy transfer, and potassium supports plant vigour, water regulation and resilience.
Supports Flowers, Fruit & New Growth
The balanced 20-20-20 source ratio provides even nutrition through vegetative growth, flowering and fruit development without heavily favouring one growth stage.
Six Essential Micronutrients
Iron, manganese, boron, copper, zinc and molybdenum support chlorophyll formation, enzyme activity and the plant processes behind healthy growth.
Fast-Mixing Liquid Concentrate
The liquid concentrate disperses quickly in water, helping you prepare an evenly diluted feed without waiting for granules or powder to dissolve.
Suitable for Multiple Growing Systems
Use as directed in soil, pots, coco and hydroponics, or at half strength as a foliar feed for suitable plants.
Concentrated, Easy-to-Calculate Value
One litre makes up to 250 litres at 4 mL/L, or up to 500 litres at the 2 mL/L half-strength rate.
Vegetables
Herbs
Flowers
Orchids
Indoor Plants
Pots & Containers
Soil
Coco
Hydroponics
How to Mix and Use NPK 20-20-20 Liquid Fertiliser
Choose the rate for your plants, measure the concentrate and dilute it thoroughly with water. Use 4 mL/L for routine root-zone feeding or 2 mL/L for sensitive plants and foliar application.
Use for established plants during active growth. Apply the diluted fertiliser around the root zone according to the product label.
Use for foliar feeding, seedlings and sensitive plants.
Mix and feed in three steps
Measure
Measure 4 mL per litre of final solution, or 2 mL per litre when using half strength.
Mix with water
Add the concentrate to water and mix thoroughly so the fertiliser is evenly dispersed.
Apply
Apply around the root zone, or mist foliage at half strength during the cooler part of the day.
Established plants: weekly during active growth
Slower winter growth: reduce to every two weeks
Foliar feeding: 2 mL/L in the cooler part of the day
NPK Fertiliser FAQs
What plants can I use NPK 20-20-20 fertiliser on?
CompleteGrow NPK 20-20-20 liquid fertiliser can be used, as directed, for vegetables, herbs, flowers, orchids, indoor plants, lawns and container gardens. Begin with the half-strength rate for seedlings, sensitive plants or unfamiliar varieties, and always follow the product label.
Can I use this liquid fertiliser in hydroponics?
Yes. It is suitable for hydroponics and coco. Crop requirements, water quality, pH and electrical conductivity (EC) vary between systems, so monitor your nutrient solution and adjust the feeding program to suit the crop.
Can I use it as a foliar feed?
Yes. Use the half-strength rate of 2 mL per litre, test a small area first, and apply during the cooler part of the day. Avoid spraying in strong sunlight, extreme heat or when plants are stressed.
How much plant food does one litre make?
One litre of concentrate makes up to 250 litres at the standard 4 mL/L rate, or up to 500 litres at the half-strength 2 mL/L rate. Measure against the final volume of diluted solution.
How often should I apply NPK 20-20-20 fertiliser?
For established plants, apply weekly during active growth and reduce to every two weeks during slower winter growth. Plant needs vary, so watch how your plants respond and follow the product label.
Should I water plants before applying liquid fertiliser?
Apply liquid fertiliser to moist growing media rather than very dry roots. This helps the diluted solution spread more evenly through the root zone. Avoid applying to waterlogged media.
Safety Data Sheet
Download the current CompleteGrow All Purpose Liquid Fertiliser Safety Data Sheet.
FAQ
Mix 4 mL of CompleteGrow NPK 20-20-20 Liquid Fertiliser per 1 litre of water for general feeding. Apply the diluted fertiliser directly to the soil around the base of your plants during normal watering.
For indoor plants, vegetables, flowers, fruit trees and general garden plants, feed regularly during active growth. For sensitive plants or light feeders, use 2 mL per litre of water at half strength.
Yes — it’s fully water-soluble, making it perfect for foliar application and hydroponic systems. No clogging, no residue.
Liquid fertiliser is a water-soluble nutrient solution that delivers fast-acting plant nutrition through both soil and foliage. Our NPK 20-20-20 liquid fertiliser is ideal for quick absorption, helping boost plant growth, leaf colour, and overall health. It’s perfect for home gardeners, hydroponics, and commercial growers seeking immediate results.
The best time to fertilise is in the early morning or late afternoon to avoid leaf burn. Fertilise weekly in spring and summer for maximum growth. Avoid feeding during heatwaves or waterlogged conditions. Always water after applying fertiliser if the soil is dry.
