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Hydroponic Grow Media Rocks and Medium

Hydroponic System DiagramIn a traditional garden, plant roots are in the soil. They support the plant and search for food and water. In hydroponics, we often use a growing medium in place of soil. The roots of a hydroponic plant do not work as hard as those of a plant grown in soil because their needs are readily met by the nutrient solution we feed them. Ideal mediums are chemically inert, porous, clean and able to drain freely.

Many materials have been used as hydroponic growing mediums. These include: vermiculite, saw dust, sand, peat moss and, more recently, rockwool, perlite and expanded clay pebbles. Today's popular growing mediums, perlite, rockwool and expanded clay pebbles are described below

Perlite
Perlite is derived from volcanic rock which has been heated to extremely high temperatures. It then explodes like popcorn, resulting in the porous, white medium we use in hydroponics. Perlite can be used loose, in pots or bagged in thin plastics sleeves, referred to as "grow bags" because the plants are grown right in the bags. Plants in perlite grow bags are usually set up on a drip feed system. Perlite grow bags usually hold 3 or 4 long-term plants. Perlite is also used in many commercial potting soil mixes.

Rockwool
Rockwool is derived from basalt rock. It too is heated to high temperatures but then is spun into fibers resembling insulation. These fibers are spun into cubes and slabs for hydroponic production.The cubes are commonly used for plant propagation and the slabs are used similarly to the perlite grow bags. A plant is set onto the rockwool slab and grown there. The plant roots grow down into the slab. Rockwool slabs usually hold 3or 4 long term plants.

Expanded Clay Pebbles
Many hobby hydroponic gardeners use expanded clay pebbles for their growing medium. Expanded clay pebbles have a neutral pH and excellent capillary action. Often Ebb and Flow systems use expanded clay pebbles in the grow pots as the growing medium.

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Clay Pebbles HYDROTON Growing Media Expanded Clay Rocks for Hydroponic systems picture

Clay Pebbles HYDROTON Growing Media Expanded Clay Rocks for Hydroponic systems

$6.45



5KG Coco Coir Brick Coconut Fiber Growing Potting Soil Plant Growing Media USA picture

5KG Coco Coir Brick Coconut Fiber Growing Potting Soil Plant Growing Media USA

$22.99



5kg Potting Soil Brick Cultivation Coconut Fibers  Coir Fibers Growing Media USA picture

5kg Potting Soil Brick Cultivation Coconut Fibers Coir Fibers Growing Media USA

$21.88



SALE 5000G Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media picture

SALE 5000G Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media

$22.99



 HYDROTON Clay Pebbles Grow Medium Expanded Clay Rocks for Hydroponic Aquaponic  picture

HYDROTON Clay Pebbles Grow Medium Expanded Clay Rocks for Hydroponic Aquaponic

$7.88



Grodan 1.5

Grodan 1.5" x 1.5" x 1.5" Delta Mini Blocks Strip w/ Holes Rockwool Cube

$5.49



Grodan Improved 10  Rockwool Wrapped  4x4x4. 12ea picture

Grodan Improved 10 Rockwool Wrapped 4x4x4. 12ea

$15.99



QUALITY MEDIUM COARSE GRADE VERMICULITE FOR SEED STARTING MEDIUM GARDEN BEDDING picture

QUALITY MEDIUM COARSE GRADE VERMICULITE FOR SEED STARTING MEDIUM GARDEN BEDDING

$13.95



Hydroponic Grow Cubes - Rockwool medium, 1/3 Cubic Foot for Grow Box, System Kit picture

Hydroponic Grow Cubes - Rockwool medium, 1/3 Cubic Foot for Grow Box, System Kit

$14.99



GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5

GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5"

$11.25



FREE GIFT Prostar Gro Rockwool Cubes 1.5'' Growing Medium (40 PCs) FREE Scissor* picture

FREE GIFT Prostar Gro Rockwool Cubes 1.5'' Growing Medium (40 PCs) FREE Scissor*

$9.20



Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes picture

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes

$12.76



HGC714112 Hydroton Original Expanded Clay Pebbles, Terra Cotta 10 Liter picture

HGC714112 Hydroton Original Expanded Clay Pebbles, Terra Cotta 10 Liter

$21.79



4 LBS Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton picture

4 LBS Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton

$20.95



PERLITE 1 gallon MEDIUM-FINE GRADE NURSERY GARDEN PLANTS SEED STARTING FASTSHIP picture

PERLITE 1 gallon MEDIUM-FINE GRADE NURSERY GARDEN PLANTS SEED STARTING FASTSHIP

$10.97



2 X 650G Coco Coir Brick Coconut Fiber Potting Soil Plant Growing Media Organic picture

2 X 650G Coco Coir Brick Coconut Fiber Potting Soil Plant Growing Media Organic

$11.99



QUALITY VERMICULITE FOR SEED STARTING MEDIUM FINE POTTING GARDEN REPTILE BEDDING picture

QUALITY VERMICULITE FOR SEED STARTING MEDIUM FINE POTTING GARDEN REPTILE BEDDING

$13.50



Coconut Coir - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---5 Cups  picture

Coconut Coir - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---5 Cups

$6.75



Coco Peat Block Coconut Husk Chips Coco Coir Organic Natural Growing Medium  picture

Coco Peat Block Coconut Husk Chips Coco Coir Organic Natural Growing Medium

$1.90



Coconut Husk Chips Husk fiber Orchids Anthodium Growing Medium  1Kg picture

Coconut Husk Chips Husk fiber Orchids Anthodium Growing Medium 1Kg

$2.90