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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 - 25 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 25 Liter

$27.09



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



GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5

GRODAN MACRO PLUG ROCKWOOL STONEWOOL STARTER CLONING MEDIA ROUND 1.5"

$11.25



Grodan 1

Grodan 1"x1 inch 6, 12, 25 or 50 Rockwool Stonewool Grow Media Starter Cubes

$6.45



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

Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development Large

$7.99



Grodan 1

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

$10.50



Grodan 1.5

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

$22.48



5LBS Expanded Clay rocks Grow Media for Hydroponic and Aquaponic systems medium picture

5LBS Expanded Clay rocks Grow Media for Hydroponic and Aquaponic systems medium

$17.99



GRODAN Mini Blocks 45 Pack 1.5

GRODAN Mini Blocks 45 Pack 1.5"x1.5" Rockwool Stonewool Cubes

$14.50



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

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes

$13.15



Grodan 1.5

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

$9.99



GRODAN 1

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

$8.95



Rockwool Cubes 100 Plugs Stonewool Seed Starter Grow Cubes for Cuttings Cloning picture

Rockwool Cubes 100 Plugs Stonewool Seed Starter Grow Cubes for Cuttings Cloning

$14.49



Grodan 1

Grodan 1" x 1" A-OK STARTER PLUGS Rockwool Cutting Clones Cubes Propagation

$28.00



Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development picture

Premium Hydroponic Rockwool Grow Cubes Rapid Plant Growth Root Development

$14.99



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

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

$275.00



Grodan 2

Grodan 2" x 2 inch 50 Sheet Rockwool Stonewool A-OK Starter Plugs Growing Media

$19.85



Geolite GMGC45L Clay Pebbles Growing Media, Grey, 45 Liter Bag picture

Geolite GMGC45L Clay Pebbles Growing Media, Grey, 45 Liter Bag

$47.46



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

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

$275.40



1.5

1.5 " GRODAN ROCKWOOL CUBES 2/6/12/28/ 50/100 (orders go same/next day ship-out)

$28.95