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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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Grodan 1.5

Grodan 1.5" x 1.5 inch Sheet of 98 Stonewool A OK Starter Plugs rockwool media

$18.75



Grodan 1

Grodan 1" x 1" - 50 count - rockwool hydroponics grow starter cubes

$9.75



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

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes

$11.99



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



Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes A-OK picture

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes A-OK

$8.99



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

HYDROTON Clay Pebbles Grow Medium Expanded Clay Rocks for Hydroponic Aquaponic

$6.89



Grodan 1

Grodan 1" AO Rockwool Starter Plugs Cubes 200 count - hydroponic aquaponic media

$21.75



Grodan 1.5

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

$7.25



Mother Earth Hydroton Original Clay Pebbles - 10 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 10 Liter

$18.26



2 Gallon Medium Grade Organic Vermiculite  picture

2 Gallon Medium Grade Organic Vermiculite

$18.25



Pro-Mix BX Potting Mix Seed Germination Soilless Growing Media Mycorrhizae FAST picture

Pro-Mix BX Potting Mix Seed Germination Soilless Growing Media Mycorrhizae FAST

$18.95



HYDROTON - Original Hydroton® Expanded Clay Pebbles choose your Volume by Pound picture

HYDROTON - Original Hydroton® Expanded Clay Pebbles choose your Volume by Pound

$29.95



PERLITE (FAST SHIP)  QUALITY MEDIUM FINE, SEED STARTING NURSERY POTTING PLANTS picture

PERLITE (FAST SHIP) QUALITY MEDIUM FINE, SEED STARTING NURSERY POTTING PLANTS

$5.95



Grodan Round Rockwool Macro Plugs 1.5

Grodan Round Rockwool Macro Plugs 1.5" Starter Cloning Plug w/ Slit Macroplugs

$17.28



Clean Coconut Husk Chips 100% Husk fiber Orchids Anthodium Growing Medium   picture

Clean Coconut Husk Chips 100% Husk fiber Orchids Anthodium Growing Medium

$44.98



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

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

$18.95



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



COCONUT COIR - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---10 Cups  picture

COCONUT COIR - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---10 Cups

$11.99



Hydroponic Clay Pebbles for Gardening, Leca Balls (Brown, 3 Sizes, 3 Lbs) picture

Hydroponic Clay Pebbles for Gardening, Leca Balls (Brown, 3 Sizes, 3 Lbs)

$17.99



5.5 L Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton picture

5.5 L Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton

$19.49