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Nutrients & Additives

Give your plants the fuel they need to thrive.

Browse our complete range of plant nutrients and additives, formulated for both soil-based and hydroponic systems. From base nutrients and bloom boosters to root stimulants, foliar sprays, and microbial inoculants, we’ve got every stage of plant growth covered.

💧 Suitable for all growing media
🌿 Backed by real-world experience & expert advice
🧪 Trusted brands, proven results, great value

Grow smarter with high-performance nutrients and additives from Hydro Oasis, no matter how you grow.

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Hydro Oasis Nutrients & Additives Mascots
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-10%
Dr Greenthumbs Root Roids Boost - 500g — Bacillus Root-Zone Booster with Amino Acids & Calcium

Dr Greenthumbs

Dr Greenthumbs Root Roids Boost

Supercharge root vitality and nutrient efficiency with a clean, powerful inoculant.

Size
$31.49
$34.99 $31.49
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Impello BioSciences Tribus - 250mL — Triple-Bacillus Microbial Inoculant for Root-Zone Performance
Impello BioSciences Tribus - 500mL — Triple-Bacillus Microbial Inoculant for Root-Zone Performance
Impello BioSciences Tribus - 1L — Triple-Bacillus Microbial Inoculant for Root-Zone Performance

Impello Biosciences

Tribus

Unlock nutrients, build roots, and accelerate growth from seedling to harvest.

Size
From $109.99
From $109.99
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-20%
GT Native Focus - 250mL — Phosphorus-Sensitive Liquid Nutrient for Native Plants (SPT)
GT Native Focus - 1L — Phosphorus-Sensitive Liquid Nutrient for Native Plants (SPT)
GT Native Focus - 5L — Phosphorus-Sensitive Liquid Nutrient for Native Plants (SPT)
GT Native Focus - 20L — Phosphorus-Sensitive Liquid Nutrient for Native Plants (SPT)

Growth Technology

GT Native Focus

Tailored low-phosphorus nutrition for thriving native Aussie plants, clean feeding, no guesswork.

Size
From $7.99
$9.99 From $7.99
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-10%
Green Planet Karbo Boost - 600g — Powdered Carbohydrate Supplement for Microbial Activity
Green Planet Karbo Boost - 1kg — Powdered Carbohydrate Supplement for Microbial Activity
Green Planet Karbo Boost - 2.3kg — Powdered Carbohydrate Supplement for Microbial Activity
Green Planet Karbo Boost - 11.3kg — Powdered Carbohydrate Supplement for Microbial Activity

Green Planet

Green Planet Karbo Boost

An easy microbial nourishment tool for superior bloom performance.

Size
From $22.49
$24.99 From $22.49
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-5%
H&G Shooting Powder - 65g — Late-Flowering PK Powder for Bloom Density & Yield
H&G Shooting Powder - 5PK pack — Late-Flowering PK Powder Sachets for Bloom Density
H&G Shooting Powder - 20PK open pack — Late-Flowering PK Powder Sachets in Loose Display

House and Garden

H&G Shooting Powder

Unlock your crop’s full potential during the final flowering push.

Size
From $23.74
$24.99 From $23.74
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-5%
H&G Top Shooter - 100mL — Liquid Late-Flower PK Booster (3-Week Bloom Finisher)
H&G Top Shooter - 250mL — Liquid Late-Flower PK Booster (3-Week Bloom Finisher)
H&G Top Shooter - 500mL — Liquid Late-Flower PK Booster (3-Week Bloom Finisher)
H&G Top Shooter - 1L — Liquid Late-Flower PK Booster (3-Week Bloom Finisher)
H&G Top Shooter - 5L — Liquid Late-Flower PK Booster (3-Week Bloom Finisher)

House and Garden

H&G Top Shooter

Push your plants beyond their normal limits with a clean, precision‑timed flowering surge.

Size
From $61.74
$64.99 From $61.74
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-10% Back-Order
SUPERthrive - All Sizes — Vitamin B1 & Kelp Tonic for Plant Vigour & Stress Recovery
SUPERthrive - 120mL — Vitamin B1 & Kelp Tonic for Plant Vigour & Stress Recovery
SUPERthrive - 480mL — Vitamin B1 & Kelp Tonic for Plant Vigour & Stress Recovery
SUPERthrive - 960mL — Vitamin B1 & Kelp Tonic for Plant Vigour & Stress Recovery
SUPERthrive - 3.78L — Vitamin B1 & Kelp Tonic for Plant Vigour & Stress Recovery

SUPERthrive

Superthrive

Strengthen your plants and improve resilience with this vitamin and kelp supplement.

Size
From $44.99
$49.99 From $44.99
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-20%
GT Fulvic - 1L — Fulvic Acid Chelating Agent for Mineral Uptake & Plant Vitality
GT Fulvic - 5.5L — Fulvic Acid Chelating Agent for Mineral Uptake & Plant Vitality

Growth Technology

GT Fulvic

Supercharge nutrient uptake and plant vitality with every drop of fulvic.

Size
From $11.99
$14.99 From $11.99
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-20%
GT Complete Focus - 250mL — All-in-One Liquid Plant Nutrient with Complete Mineral Profile
GT Complete Focus - 1L — All-in-One Liquid Plant Nutrient with Complete Mineral Profile
GT Complete Focus - 5L — All-in-One Liquid Plant Nutrient with Complete Mineral Profile
GT Complete Focus - 20L — All-in-One Liquid Plant Nutrient with Complete Mineral Profile

Growth Technology

GT Complete Focus

One bottle, countless possibilities, GT Complete Focus does it all!

Size
From $7.99
$9.99 From $7.99
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-20%
GT Rose Focus - 250mL — Liquid Nutrient for Roses & Flowering Shrubs (SPT Formula)
GT Rose Focus - 1L — Liquid Nutrient for Roses & Flowering Shrubs (SPT Formula)
GT Rose Focus - 5L — Liquid Nutrient for Roses & Flowering Shrubs (SPT Formula)
GT Rose Focus - 20L — Liquid Nutrient for Roses & Flowering Shrubs (SPT Formula)

Growth Technology

GT Rose Focus

Elevate your rose display with clean, focused nutrition.

Size
From $7.99
$9.99 From $7.99
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-5% Back-Order
H&G Starter Kits — Complete Nutrient Packages for Soil Coco & Recirculating Hydro Systems
H&G Starter Kits - Soil — Complete Nutrient & Additive Bundle for Soil-Based Crops
H&G Starter Kits - Cocos — Complete Nutrient & Additive Bundle for Coco Coir Crops
H&G Starter Kit - Aqua Flakes — Complete Nutrient & Additive Bundle for Recirculating Hydro

House and Garden

H&G Starter Kit

All-in-one nutrient solutions for healthy, productive plants from start to finish.

Kit
$265.99
$279.99 $265.99
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-20%
GT Foliar - 500mL — Ready-to-Use Foliar Spray with Kelp Aminos Fulvic Acid & Silicon
GT Foliar - 5.5L — Ready-to-Use Foliar Spray with Kelp Aminos Fulvic Acid & Silicon

Growth Technology

GT Foliar RTU

Instant foliar power, nutritious misting for faster growth, yield, and plant vitality.

Size
From $15.99
$19.99 From $15.99
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-20%
FloraMax Ca-Mg-Fe - All Sizes — Calcium, Magnesium & Iron Supplement with Chelated Trace Elements
FloraMax Ca-Mg-Fe - 250ml — Cal-Mag-Iron Supplement with Chelated Trace Elements
FloraMax Ca-Mg-Fe - 1L — Cal-Mag-Iron Supplement with Chelated Trace Elements
FloraMax Ca-Mg-Fe - 5L — Cal-Mag-Iron Supplement with Chelated Trace Elements
FloraMax Ca-Mg-Fe - 20L — Cal-Mag-Iron Supplement with Chelated Trace Elements
FloraMax Ca-Mg-Fe - 1000L — Cal-Mag-Iron Supplement, Commercial Bulk Drum

FloraMax

FloraMax Ca-Mg-Fe

Rescue weak, stressed plants and protect against hidden deficiencies with this advanced mineral booster.

Size
From $11.99
$14.99 From $11.99
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-20%
FloraMax System Maintenance - All Sizes — Organic Cleaner for Biofilm & Dripper Blockage Control
FloraMax System Maintenance - 250mL — Organic Cleaner for Biofilm & Sediment Control
FloraMax System Maintenance - 1L — Organic Cleaner for Biofilm & Sediment Control
FloraMax System Maintenance - 5L — Organic Cleaner for Biofilm & Sediment Control
FloraMax System Maintenance - 20L — Organic Cleaner for Biofilm & Sediment Control
FloraMax System Maintenance - 1000L — Organic System Cleaner Commercial Bulk Drum

FloraMax

FloraMax System Maintenance

Keep your system clean, clear, and consistently productive with this chemist-formulated preventative feed.

Size
From $11.99
$14.99 From $11.99
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-15%
Bio Diesel Bloom Enhancer - All Sizes — Organic Flowering Stimulant for Mass Resin & Terpenes
Bio Diesel Bloom Enhancer - 250mL — Organic Flowering Stimulant for Mass Resin & Terpenes
Bio Diesel Bloom Enhancer - 1L — Organic Flowering Stimulant for Mass Resin & Terpenes
Bio Diesel Bloom Enhancer - 5L — Organic Flowering Stimulant for Mass Resin & Terpenes
Bio Diesel Bloom Enhancer - 20L — Organic Flowering Stimulant for Mass Resin & Terpenes

Bio Diesel Nutrients

Bio Diesel Bloom Enhancer

Drive your plants towards fuller, more aromatic harvests with targeted bloom support.

Size
From $16.99
$19.99 From $16.99
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-20%
GT Fruit Focus - 250mL — Liquid Nutrient for Fruiting Plants (Citrus Berries & Stone Fruit)
GT Fruit Focus - 1L — Liquid Nutrient for Fruiting Plants (Citrus Berries & Stone Fruit)
GT Fruit Focus - 5L — Liquid Nutrient for Fruiting Plants (Citrus Berries & Stone Fruit)
GT Fruit Focus - 20L — Liquid Nutrient for Fruiting Plants (Citrus Berries & Stone Fruit)

Growth Technology

GT Fruit Focus

Elevate your fruiting game with clean, powerful performance.

Size
From $7.99
$9.99 From $7.99
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-5% Back-Order
Bardee Super Fly Fast Acting - 250g — Organic BSF Frass Fertiliser for Soil Health & Plant Nutrition
Bardee Super Fly Fast Acting - 5kg — Organic BSF Frass Fertiliser for Soil Health & Plant Nutrition

Bardee

Bardee Superfly - Fast Acting

A powerful organic fertiliser that delivers quick nutrition and long-term soil health in every application.

Size
From $9.49
$9.99 From $9.49
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-10%
Green Planet Horti Cal - 2.3kg — 14-0-0 Dry Cal-Mag-Nitrogen Fertiliser for Veg & Bloom

Green Planet

Green Planet Horti Cal

A calcium‑magnesium base that safeguards plants from deficiency and builds resilience from start to finish.

Size
$35.99
$39.99 $35.99
View product
-10%
Green Planet Horti Bloom - 2.3kg — 5-15-26 Dry Base Fertiliser for Early-to-Mid Flowering

Green Planet

Green Planet Horti Bloom

A clean, high‑phosphorus base to ignite your crop’s flowering phase.

Size
$53.99
$59.99 $53.99
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-15%
Bio Diesel Super Natural - All Sizes — Organic Growth Stimulant with Cold-Processed Sea Algae
Bio Diesel Super Natural - 250mL — Organic Growth Stimulant with Cold-Processed Sea Algae
Bio Diesel Super Natural - 1L — Organic Growth Stimulant with Cold-Processed Sea Algae
Bio Diesel Super Natural - 5L — Organic Growth Stimulant with Cold-Processed Sea Algae

Bio Diesel Nutrients

Bio Diesel Super Natural

Early strength and vitality for bigger, healthier harvests.

Size
From $29.74
$34.99 From $29.74
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-15%
Bio Diesel Crystal Clear - All Sizes — Organic Flushing Solution for Coco & Peat Systems
Bio Diesel Crystal Clear - 1L — Organic Pre-Harvest Flushing Solution for Coco & Peat
Bio Diesel Crystal Clear - 5L — Organic Pre-Harvest Flushing Solution for Coco & Peat
Bio Diesel Crystal Clear - 20L — Organic Pre-Harvest Flushing Solution for Coco & Peat

Bio Diesel Nutrients

Bio Diesel Crystal Clear

A sweeter, cleaner finish without the waste.

Size
From $12.74
$14.99 From $12.74
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-20%
FloraMax Clone Spray - All Sizes — Foliar Spray for Clone Rooting & Early Veg Development
FloraMax Clone Spray - 250ml — Foliar Spray for Clone Rooting & Seedling Development
FloraMax Clone Spray - 1L — Foliar Spray for Clone Rooting & Seedling Development
FloraMax Clone Spray - 5L — Foliar Spray for Clone Rooting & Seedling Development

FloraMax

FloraMax Clone Spray

Jump-start your crop with fast, clean-growing seedlings and clones.

Size
From $35.99
$44.99 From $35.99
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-5%
CANNA Terra Flores - 1L — Single-Part Bloom Nutrient for Soil & Potting Mix Cultivation
CANNA Terra Flores - 5L — Single-Part Bloom Nutrient for Soil & Potting Mix Cultivation

CANNA

CANNA Terra Flores

Deliver essential nutrients for vibrant, high-quality blooms in soil-grown plants.

Size
From $47.49
$49.99 From $47.49
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-15%
Bio Diesel Rhino K - All Sizes — Concentrated Potassium Boost for Late-Flower Density
Bio Diesel Rhino K - 1L — Concentrated Potassium Boost for Late-Flower Density
Bio Diesel Rhino K - 5L — Concentrated Potassium Boost for Late-Flower Density
Bio Diesel Rhino K - 20L — Concentrated Potassium Boost for Late-Flower Density

Bio Diesel Nutrients

Bio Diesel Rhino K

Unlock your crop’s peak performance during the final flowering push.

Size
From $21.24
$24.99 From $21.24
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