Plant Fertiliser
Better Nutrition. Better Growth.
CompleteGrow fuels your plants with powerful, targeted nutrition—indoors, outdoors, or hydroponically. Made by Aussie experts and loved by everyday growers, it’s clean, concentrated, and proven to work. Plant fertiliser for every plant in your garden. We let the plants do the talking.
Plant Food
Formula
Concentrate
& Hydro
250L of Plant Feed
Aussie Growers
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The best plant fertiliser for most Australian gardens is a high-strength, balanced NPK 20-20-20, which supports healthy leaves, stems and roots during active growth. When plants begin flowering and fruiting, the best plant fertiliser to switch to is NPK 4-18-38, with higher phosphorus and potassium to support more flowers and fruit. Shop our Australian-made liquid and water-soluble plant fertilisers for stronger growth, greener leaves, better flowering and healthier plants.
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All Purpose Plant Liquid Fertiliser – Formulated from NPK 20-20-20 & Micro Nutrients
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Advanced Formula – Boost Flowering & Fruiting – NPK 4-18-38 + Calcium & Magnesium
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Citrus Fertiliser – Lemon, Lime & Orange Tree – NPK 6-2-12 + Trace Elements
Orchid Pro Grow & Bloom Duo Liquid orchid fertiliser for leaves, roots and flowers 2 × 500 mL concentrates · Makes 1,000 L
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NPK 20-20-20 Powder Soluble Nutrient Plant Fertilizer & Micro Nutrients
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Premium Plant Nutrition. Professional Results.
Concentrated formulas designed to support stronger growth, healthier plants and productive harvests without complicated feeding routines.
Supports Full-Cycle Growth
Targeted nutrition for stronger roots, healthy foliage, flowering and productive harvests.
Professional-Grade Nutrients
Quality mineral nutrients selected for consistent, predictable feeding across different plant types.
Highly Concentrated Formula
More feeding power in every scoop, so each pack goes further with less product needed per feed.
Made for Every Growing Space
Options for indoor plants, garden beds, citrus, flowering crops and hydroponic systems.
Real Plants. Real Results.
“I’ve been trying to find an indoor liquid plant food that doesn’t have a bad odour and won’t burn my plants.”
“One of the best plant foods I’ve used — and it’s Australian made.”
“Incredible results with CompleteGrow. My plants are thriving like never before. Fantastic value for money.”
Real Results. In Just 7 Days.
The same garden bed, photographed one week apart after feeding with CompleteGrow NPK 20-20-20.
Before feeding
Smaller plants, fewer leaves and less even growth.
After 7 days with CompleteGrow
Fuller growth, improved structure and greener foliage.
Why growers switch
CompleteGrow vs the Rest.
A clearer look at nutrition, versatility, consistency and value.
CompleteGrow
Premium Plant Nutrition
Typical Store Brands
Standard Plant Food
Inconsistent feedingMissing micronutrientsLeaves residue & clogsWeak Npk Blend
Organic Manure Feed
Natural Soil Nutrition
Very slow availabilitySlow, mild growthBatch-to-batch varianceSee How Easy Feeding Can Be.
Prepare Your Sprayer
Open the sprayer bottle and get it ready for your fertiliser and water mix.
Add Fertiliser & Water
For the medium rate, add 250 mL fertiliser and 750 mL water to the 1 L sprayer bottle.
Connect & Feed
Attach the sprayer to your hose, select the correct setting and apply evenly around your plants.
Find Your Formula. Grow Better.
Precision mineral blends designed to feed, protect, and maximize every plant in your collection.
All Purpose Plant Food
Double-strength balanced nutrition for stronger roots, greener foliage and healthy growth across almost every plant type.
- Suitable for indoor, outdoor and hydroponic plants
- Balanced nutrition for full-cycle growth
- Concentrated formula for efficient feeding
Flowering & Fruiting
High-performance nutrition designed to support stronger flowering, fruit formation and more productive harvests.
- Supports flower development and fruit formation
- Ideal for tomatoes, chillies and flowering crops
- Concentrated powder for precise feeding
Indoor Plant Food
Balanced liquid nutrition designed for leafy indoor plants, healthy foliage and steady indoor growth.
- Supports healthy leaf colour and new growth
- Suitable for a wide range of indoor plants
- Simple low-mess liquid feeding
Citrus & Fruit
Specially designed for lemons, limes, oranges, mandarins and other productive fruiting plants.
- Supports healthy fruit and productive growth
- Suitable for citrus and backyard fruit trees
- Helps maintain vigorous green foliage
Lawn Food
Concentrated lawn nutrition designed to support greener colour, healthy coverage and reliable outdoor growth.
- Supports deeper green lawn colour
- Helps maintain strong, even growth
- Suitable for regular lawn feeding
NPK 20-20-20 Powder
Double-strength water-soluble powder with balanced nitrogen, phosphorus and potassium for versatile feeding.
- Balanced full-cycle plant nutrition
- Fast-dissolving concentrated powder
- Suitable for soil and hydroponic use
Cactus & Succulent Plant Food
Low-nitrogen liquid nutrition for compact, healthy growth across cacti, succulents, jade and aloe.
- Designed for cacti, succulents, jade and aloe
- Supports strong roots and flowering
- Controlled feeding without soft, leggy growth
Hydroponic Nutrients A & B
Commercial-strength two-part nutrition for clean mixing, dependable uptake and vigorous hydroponic growth.
- Designed for DWC, NFT, drip, coco and recirculating systems
- Complete A & B base nutrient formula
- High-availability minerals for reliable uptake
Cal-Mag
Chelated liquid calcium and magnesium for heavy-feeding plants, stronger new growth and deep green leaves.
- Helps prevent blossom end rot and tip burn
- Suitable for grow and flower stages
- Double-strength formula, 0.5–1 mL per litre
Orchid Grow & Bloom
Two-stage liquid orchid feed: Grow for leaves and roots, Bloom for spikes, buds and longer-lasting flowers.
- Orchid Grow NPK 14-3-11 for leaves, roots and pseudobulbs
- Orchid Bloom NPK 8-18-24 for spikes, buds and flowers
- 1 mL per litre at every watering
Let Your Plants Do the Talking
Real results show up in your garden: stronger growth, deeper greens, and plants that don’t just get by. They thrive.
Video credit: @timeandplace
Plant fertiliser FAQs.
Not sure which one you need? Tell us what you're growing: (02) 9053 1426
What is the best plant fertiliser?
The best plant fertiliser for most gardens is a balanced NPK 20-20-20 with trace elements while plants are growing, then a high-potassium NPK 4-18-38 when they flower and fruit. Use a dedicated formula for citrus, orchids, lawns and indoor plants.
What do the NPK numbers on plant fertiliser mean?
They show the percentage of nitrogen (N), phosphorus (P) and potassium (K). Nitrogen builds leaves and stems, phosphorus drives roots and flowers, and potassium improves fruit, flower quality and plant strength. Compare ratios in our NPK fertiliser range.
How often should I fertilise my plants?
Feed most garden plants every 2–4 weeks from spring to autumn at the rate on the label, and reduce or pause feeding in winter when growth slows. Water dry soil or potting mix before you feed.
Is liquid or powder plant fertiliser better?
Both supply the same nutrients. Liquid is ready to measure and mix, so it suits pots and home gardens. Water-soluble powder is the economical pick for bigger gardens, market gardens and commercial growers.
Which plant fertiliser is best for indoor plants?
Use a gentle concentrate made for houseplants, such as CompleteGrow Indoor Plant Food, at the label rate while plants are actively growing in spring and summer.
Is CompleteGrow plant fertiliser made in Australia?
Yes. CompleteGrow plant fertilisers are made in Australia. We deliver Australia-wide, with our own delivery across Sydney, Newcastle and Wollongong.
The Grow Blog
Fresh tips pop up here as the garden changes through the year. Pull one up and have a read.
