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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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Mother Earth Hydroton Original Clay Pebbles - 10 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 10 Liter

$18.26



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



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

HYDROTON Clay Pebbles Grow Media Expanded Clay Rocks for Hydroponic Aquaponic

$24.98



Grodan 1

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

$19.75



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

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

$11.99



Grodan 1.5

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

$7.25



PERLITE (FAST SHIP) QUALITY COURSE- MEDIUM SEED STARTING NURSERY POTTING PLANTS picture

PERLITE (FAST SHIP) QUALITY COURSE- MEDIUM SEED STARTING NURSERY POTTING PLANTS

$19.95



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 1.5

Grodan 1.5" AO Rockwool Starter Plugs, Sheet of 49 Cubes - Grow Media

$12.99



100% COCO COIR PEAT - ORGANIC HYDROPONIC GROWING MEDIA POTTING SOIL MICROGREENS picture

100% COCO COIR PEAT - ORGANIC HYDROPONIC GROWING MEDIA POTTING SOIL MICROGREENS

$11.99



Redrock Rockwool 4

Redrock Rockwool 4" PRO Grow Block Hydroponic | 36 Pack + Twin Canaries Chart

$18.99



Redrock Rockwool - 6

Redrock Rockwool - 6" PRO Grow Block w/Hole - 4 Pack with Twin Canaries Chart

$16.99



6 Pack 6

6 Pack 6" x 6" Hydroponics Rockwool Grow Cubes

$29.99



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 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



1 LB Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton picture

1 LB Clay Pebbles Grow Media Expanded Rocks , Hydroponic Aquaponic , Hydroton

$10.95



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

QUALITY FINE GRADE VERMICULITE FOR SEED STARTING MEDIUM GARDEN REPTILE BEDDING

$12.40



Grodan Round Rockwool 1.5

Grodan Round Rockwool 1.5" Macro Plugs (5, 25, 50, 100) - Slit Included

$9.80



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

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

$22.95



10 LBS Clay Pebbles Grow Media Expanded Rocks Hydroponic Aquaponic  Hydroton 14L picture

10 LBS Clay Pebbles Grow Media Expanded Rocks Hydroponic Aquaponic Hydroton 14L

$29.95