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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



Mother Earth Hydroton Original Clay Pebbles - 25 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 25 Liter

$27.09



Grodan 1.5

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

$12.99



Grodan 1.5

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

$4.75



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



Grodan 1

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

$19.75



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



QUALITY PERLITE FOR SEED STARTING MEDIUM FINE NURSERY POTTING GARDEN PLANTS USA picture

QUALITY PERLITE FOR SEED STARTING MEDIUM FINE NURSERY POTTING GARDEN PLANTS USA

$7.94



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

HYDROTON Clay Pebbles Grow Media Expanded Clay Rocks for Hydroponic Aquaponic

$9.98



Grodan 1.5

Grodan 1.5" AO Rockwool Starter Plug Cubes 98 count - hydroponic aquaponic media

$19.75



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



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



Grodan Round Rockwool 1.5

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

$11.75



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



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

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

$5.95



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

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

$19.95



Grodan 1.5

Grodan 1.5" A OK Starter Plugs Cubes 1/12/49/98 count - rockwool grow media

$7.99



QUALITY PERLITE FOR SEED STARTING MEDIUM FINE NURSERY POTTING GARDEN PLANTS picture

QUALITY PERLITE FOR SEED STARTING MEDIUM FINE NURSERY POTTING GARDEN PLANTS

$12.99



1 GALLON OF VERMICULITE FOR SEED STARTING FINE - MEDIUM - LARGE GARDEN BEDDING picture

1 GALLON OF VERMICULITE FOR SEED STARTING FINE - MEDIUM - LARGE GARDEN BEDDING

$12.99



Grodan DELTA 10 BLOCK (6pcs) 4

Grodan DELTA 10 BLOCK (6pcs) 4" x 4" x 4" With Hole Rockwool Cuttings Clones

$16.50