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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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Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development Large picture

Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development Large

$10.99



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

Clay Pebbles HYDROTON Growing Media Expanded Clay Rocks for Hydroponic systems

$7.95



VIVOSUN 1

VIVOSUN 1"/1.6" Rockwool Cubes Stonewool Starter for Rooting, Cutting Plants

$13.49



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

Clay Pebbles HYDROTON Growing Media Expanded Clay Rocks for Hydroponic systems

$19.08



GRODAN 1

GRODAN 1" (SQUARE TOP) 25,50,100 0R 200 ROCKWOOL STONEWOOL MEDIA STARTER CUBES

$9.25



Grodan 1.5

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

$19.99



GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5

GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5"

$27.99



Grodan 1.5

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

$21.99



Grodan 1.5

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

$22.49



Grodan Rockwool Stonewool Grow Chunks  2 Cubic Ft Bag 3/4 Inch Chunks picture

Grodan Rockwool Stonewool Grow Chunks 2 Cubic Ft Bag 3/4 Inch Chunks

$61.57



1.5 inch GRODAN ROCKWOOL CUBES 2/6/12/28/ 50/100 (same or next day ship-out) picture

1.5 inch GRODAN ROCKWOOL CUBES 2/6/12/28/ 50/100 (same or next day ship-out)

$29.95



GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5

GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5"

$18.65



GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5

GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5" - 50 Pack

$17.99



VIVOSUN 1

VIVOSUN 1" Rockwool Cubes,4 Sheets of 200 Plugs,for Rooting, Cuttings, Plants

$14.44



Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development picture

Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development

$18.98



1-30 pounds of plant clay pebbles - Natural clay pebbles for indoor plants picture

1-30 pounds of plant clay pebbles - Natural clay pebbles for indoor plants

$11.69



1 inch GRODAN ROCKWOOL 10/25/50/100/200  STARTER GROW CUBES (same/next day ship) picture

1 inch GRODAN ROCKWOOL 10/25/50/100/200 STARTER GROW CUBES (same/next day ship)

$25.95



rockwool slab picture

rockwool slab

$4.50



VIVOSUN 1.6

VIVOSUN 1.6" 112 Plugs Rockwool Cubes Hydroponics Grow Stonewool Starter Cubes

$14.39



Grodan 1.5

Grodan 1.5" A-OK Starter Plugs 49 Cube Count Stone Rockwool Grow Media

$14.99