FREE SHIPPING icon
FREE SHIPPING

Orders over $499

RARE & EXOTIC PLANTS icon
RARE & EXOTIC PLANTS

Hard-to-find varieties

PREMIUM QUALITY icon
PREMIUM QUALITY

Only the best for your grow

 chevron_left chevron_right

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.

Read more Read less
Hydro Oasis Nutrients & Additives Mascots
Filters

View

-5%
Plant Revolution Great White - All Sizes — Mycorrhizae Bacteria & Trichoderma Root Inoculant
Plant Revolution Great White - 150g — Mycorrhizae Bacteria & Trichoderma Root Inoculant
Plant Revolution Great White - 750g — Mycorrhizae Bacteria & Trichoderma Root Inoculant

Plant Revolution

Great White Premium Mycorrhizae

Empower your plants with a premium blend of beneficial mycorrhizae and microbes.

Size
From $71.24
$74.99 From $71.24
View product
-20%
FloraMax Veg-1 - All Sizes — Single-Part Base Nutrient for Veg & Bloom
FloraMax Veg-1 - 1L — Single-Part Base Nutrient for Hydro, Coco & Soil
FloraMax Veg-1 - 5L — Single-Part Base Nutrient for Hydro, Coco & Soil
FloraMax Veg-1 - 20L — Single-Part Base Nutrient for Hydro, Coco & Soil
FloraMax Veg-1 - 1000L — Single-Part Base Nutrient, Commercial Bulk Drum

FloraMax

FloraMax Veg-1

Simplify your nutrient routine without compromising quality or plant performance.

Size
From $7.99
$9.99 From $7.99
View product
-15%
Bio Diesel Aloevate - All Sizes — Organic Aloe & Yucca Plant Tonic for Health & Resilience
Bio Diesel Aloevate - 250mL — Organic Aloe & Yucca Plant Tonic for Health & Resilience
Bio Diesel Aloevate - 1L — Organic Aloe & Yucca Plant Tonic for Health & Resilience
Bio Diesel Aloevate - 5L — Organic Aloe & Yucca Plant Tonic for Health & Resilience
Bio Diesel Aloevate - 20L — Organic Aloe & Yucca Plant Tonic for Health & Resilience

Bio Diesel Nutrients

Bio Diesel Aloevate

Organic aloe & yucca formula for stronger, healthier, more resilient plants.

Size
From $16.99
$19.99 From $16.99
View product
-20%
GT Orchid Bloom Focus - 250mL — Premium Liquid Nutrient for Orchid Bloom Colour & Longevity
GT Orchid Bloom Focus - 1L — Premium Liquid Nutrient for Orchid Bloom Colour & Longevity
GT Orchid Bloom Focus - 5L — Premium Liquid Nutrient for Orchid Bloom Colour & Longevity
GT Orchid Bloom Focus - 20L — Premium Liquid Nutrient for Orchid Bloom Colour & Longevity

Growth Technology

GT Orchid Focus Bloom

Specialist bloom support for orchids, from spectacular colour to lasting floral displays.

Size
From $7.99
$9.99 From $7.99
View product
-10%
Optic Foliar REV - 1L — Foliar Supplement with Micros B1 & Aminos (Pairs with Watts)

Optic Foliar

Optic Foliar Rev

 
Size
From $44.99
$49.99 From $44.99
View product
-10%
Optic Foliar WATTS - 1L — Light-Energy Catalyst for ATP & Chlorophyll Production

Optic Foliar

Optic Foliar Watts

Turn light into growth power, energise your plants with Watts.

Size
From $44.99
$49.99 From $44.99
View product
-10%
Green Planet Back Country Blend Bloom - 100g — Controlled-Release Granular Bloom Base for Outdoor
Green Planet Back Country Blend Bloom - 5kg — Controlled-Release Granular Bloom Base for Outdoor
Green Planet Back Country Blend Bloom - 10kg — Controlled-Release Granular Bloom Base for Outdoor
Green Planet Back Country Blend Bloom - 20kg — Controlled-Release Granular Bloom Base for Outdoor

Green Planet

Green Planet Back Country Blend Bloom

A reliable bloom base for heavy, high‑quality outdoor harvests.

Size
From $4.49
$4.99 From $4.49
View product
-10%
Green Planet Back Country Blend Boost - 100g — Granular Bloom Booster with PK & Calcium
Green Planet Back Country Blend Boost - 5kg — Granular Bloom Booster with PK & Calcium
Green Planet Back Country Blend Boost - 10kg — Granular Bloom Booster with PK & Calcium

Green Planet

Green Planet Back Country Blend Boost

An effortless outdoor solution for stronger plants, healthier soil, and bigger harvests.

Size
From $4.49
$4.99 From $4.49
View product
-20%
GT Ionic Bloom - 1L — Single-Part Bloom Nutrient for Hydroponic Flowering & Fruiting
GT Ionic Bloom - 5.5L — Single-Part Bloom Nutrient for Hydroponic Flowering & Fruiting

Growth Technology

GT Ionic Bloom

Simplify your flowering feed program with a clean, buffered single-part nutrient.

Size
From $15.99
$19.99 From $15.99
View product
-20%
GT Herb Focus - 250mL — Liquid Nutrient for Culinary Herbs & Leafy Greens (SPT Formula)
GT Herb Focus - 1L — Liquid Nutrient for Culinary Herbs & Leafy Greens (SPT Formula)
GT Herb Focus - 5L — Liquid Nutrient for Culinary Herbs & Leafy Greens (SPT Formula)
GT Herb Focus - 20L — Liquid Nutrient for Culinary Herbs & Leafy Greens (SPT Formula)

Growth Technology

GT Herb Focus

Specialised care for herbs, from kitchen pots to commercial production.

Size
From $7.99
$9.99 From $7.99
View product
-20%
FloraMax VegaFlora A+B - 1L — Two-Part Base Nutrient for Seed-to-Harvest Hydro, Coco & Soil
FloraMax VegaFlora A+B - 5L — Two-Part Base Nutrient for Hydro, Coco & Soil
FloraMax VegaFlora A+B - 20L — Two-Part Base Nutrient for Hydro, Coco & Soil

FloraMax

FloraMax VegaFlora A+B

Simplify crop cycles with a nutrient that performs reliably from clone to harvest.

Size
From $35.99
$44.99 From $35.99
View product
-10%
Optic Foliar ATAK - 1L — Foliar Conditioner for Clean Resilient Leaf Surfaces

Optic Foliar

Optic Foliar Atak

Rapid, on‑contact protection against mould, mildew, and fungal threats, safe for plants and beneficial insects at all growth stages.

Size
From $22.49
$24.99 From $22.49
View product
-5%
HyMax Trichoderma - 100mL — Trichoderma Root-Zone Inoculant for Hydro Coco & Soil
HyMax Trichoderma - 250mL — Trichoderma Root-Zone Inoculant for Hydro Coco & Soil
HyMax Trichoderma - 500mL — Trichoderma Root-Zone Inoculant for Hydro Coco & Soil
HyMax Trichoderma - 1L — Trichoderma Root-Zone Inoculant for Hydro Coco & Soil

Beneficial Bacteria for Agri-Aquaculture - BBA

BBA HyMax Trichoderma

Support a balanced and biologically active root zone with beneficial Trichoderma fungi.

Size
From $47.49
$49.99 From $47.49
View product
-10%
Dr Greenthumbs Fruit Roids - 100g — Organic Flowering Enhancer with Enzymes Aminos & Carbs

Dr Greenthumbs

Dr Greenthumbs Fruit Roids

An organic powerhouse that increases flower size, resin content, and crop resilience.

Size
From $53.99
$59.99 From $53.99
View product
-10%
Green Planet PK Spike - 1L — 0-14-15 PK Bloom Accelerator for Flower Initiation & Density
Green Planet PK Spike - 5L — 0-14-15 PK Bloom Accelerator for Flower Initiation & Density
Green Planet PK Spike - 20L — 0-14-15 PK Bloom Accelerator for Flower Initiation & Density

Green Planet

Green Planet PK Spike

A precision bloom booster for serious weight and quality gains.

Size
From $31.49
$34.99 From $31.49
View product
-10%
Green Planet GP3 Professional Starter Kit — Complete 3-Part Nutrient Program (Grow Micro Bloom)
Green Planet GP3 Professional Starter Kit - Contents — GP3 Grow Micro & Bloom bottles unboxed

Green Planet

Green Planet GP3 Professional Starter Kit

Complete, cohesive nutrition for dependable, high‑quality crops.

Size
$269.99
$299.99 $269.99
View product
-10%
Green Planet Plant Guard - 1L — Potassium Silicate for Cell Wall Strength & Plant Resilience
Green Planet Plant Guard - 5L — Potassium Silicate for Cell Wall Strength & Plant Resilience
Green Planet Plant Guard - 20L — Potassium Silicate for Cell Wall Strength & Plant Resilience

Green Planet

Green Planet Plant Guard

Builds resilient plants that withstand stress and deliver consistent harvest quality.

Size
From $58.49
$64.99 From $58.49
View product
-5%
CANNA Classic Flores A + B - 1L — Two-Part Bloom Nutrient for Run-to-Waste Hydroponic Systems
CANNA Classic Flores A + B - 5L — Two-Part Bloom Nutrient for Run-to-Waste Hydroponic Systems
CANNA Classic Flores A + B - 10L — Two-Part Bloom Nutrient for Run-to-Waste Hydroponic Systems

CANNA

CANNA Classic Flores A+B

Achieve vibrant, high-quality blooms with targeted nutrition for run-to-waste systems.

Size
From $61.74
$64.99 From $61.74
View product
-5%
H&G Aqua Flakes A+B - 1L — Two-Part Base Nutrient for Recirculating Hydroponic Systems
H&G Aqua Flakes A+B - 5L — Two-Part Base Nutrient for Recirculating Hydroponic Systems
H&G Aqua Flakes A+B - 10L — Two-Part Base Nutrient for Recirculating Hydroponic Systems
H&G Aqua Flakes A+B - 20L — Two-Part Base Nutrient for Recirculating Hydroponic Systems

House and Garden

H&G Aqua Flakes A+B

Deliver precision feeding and maximum growth potential in any recirculating hydroponic system.

Size
From $47.49
$49.99 From $47.49
View product
-5%
CANNA PK 13-14 - 250mL — High-Strength PK Bloom Booster for Denser Flowering
CANNA PK 13/14 - 1L — High-Strength PK Bloom Booster for Denser Flowering
CANNA PK 13/14 - 5L — High-Strength PK Bloom Booster for Denser Flowering

CANNA

CANNA PK 13-14

Maximise your plant’s flowering potential with targeted phosphorus and potassium supplementation.

Size
From $23.74
$24.99 From $23.74
View product
-10%
Optic Foliar Switch - 1L — Flower-Initiation Foliar Spray for Faster Veg-to-Bloom Switch
Optic Foliar Switch - 4L — Flower-Initiation Foliar Spray for Faster Veg-to-Bloom Switch

Optic Foliar

Optic Foliar Switch

Fast-track bloom, control plant structure, and protect flower quality from day one.

Size
From $40.49
$44.99 From $40.49
View product
-20%
FloraMax Silica - All Sizes — Bioavailable Silica Supplement for Cell Strength & Stress Resistance
FloraMax Silica - 250ml — Silica Supplement for Cell Wall Strength & Stress Resistance
FloraMax Silica - 1L — Silica Supplement for Cell Wall Strength & Stress Resistance
FloraMax Silica - 5L — Silica Supplement for Cell Wall Strength & Stress Resistance
FloraMax Silica - 20L — Silica Supplement for Cell Wall Strength & Stress Resistance

FloraMax

FloraMax Silica

Boost plant durability and output with this premium, long-lasting silica formula.

Size
From $31.99
$39.99 From $31.99
View product
-15%
Bio Diesel Green Diamond - 1L — Two-Part A+B Base Nutrient for Hydro & Coco Systems
Bio Diesel Green Diamond - 5L — Two-Part A+B Base Nutrient for Hydro & Coco Systems
Bio Diesel Green Diamond - 20L — Two-Part A+B Base Nutrient for Hydro & Coco Systems

Bio Diesel Nutrients

Bio Diesel Green Diamond

Full-spectrum nutrition, dialled in for responsive growth and efficiency.

Size
From $38.24
$44.99 From $38.24
View product
-5%
CANNA Cannazym - 250mL — Enzyme Additive for Root-Zone Cleansing & Nutrient Recycling
CANNA Cannazym - 1L — Enzyme Additive for Root-Zone Cleansing & Nutrient Recycling
CANNA Cannazym - 5L — Enzyme Additive for Root-Zone Cleansing & Nutrient Recycling

CANNA

CANNA Cannazym

Maintain a clean, biologically active root environment for healthier, more resilient plants.

Size
From $28.49
$29.99 From $28.49
View product