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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.

Satco S9391 Multi Pack 22W LED HID  Light Medium Bulbs High Lumen Lamps Volts 1  picture
Satco S9391 Multi Pack 22W LED HID Light Medium Bulbs High Lumen Lamps Volts 1
$289.99

72 Plant Hydroponic 3 Tower Garden DIY - Mr Stacky Australia (Medium 33cm pots) picture
72 Plant Hydroponic 3 Tower Garden DIY - Mr Stacky Australia (Medium 33cm pots)
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Botanicare CNS17 Grow & Bloom for ALL MEDIA - hydroponics soil coco nutrients picture
Botanicare CNS17 Grow & Bloom for ALL MEDIA - hydroponics soil coco nutrients
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Satco S9678 MULTI PACK 18W Amber LED Turtle Season Safe Medium High Lumen HID  picture
Satco S9678 MULTI PACK 18W Amber LED Turtle Season Safe Medium High Lumen HID
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General Hydroponics RainForest 66 Aeroponic System for Medium to Large Size P... picture
General Hydroponics RainForest 66 Aeroponic System for Medium to Large Size P...
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(Case of 2,430) Cultilene Rockwool Macro Plugs 1.5
(Case of 2,430) Cultilene Rockwool Macro Plugs 1.5" Round w/ Slit GREAT VALUE
$274.95

Integra Boost RH 62% 2 Way Humidity Control Medium 8g Gram, case of 300 picture
Integra Boost RH 62% 2 Way Humidity Control Medium 8g Gram, case of 300
$267.95

Integra Boost RH 55% 2 Way Humidity Control Medium 8g Gram, case of 300 picture
Integra Boost RH 55% 2 Way Humidity Control Medium 8g Gram, case of 300
$267.95

400w Electronic Digital Ballast HPS MH Grow Light System Hydroponics 120/240v picture
400w Electronic Digital Ballast HPS MH Grow Light System Hydroponics 120/240v
$260.39

Coco A&B - Base Hydroponic Nutrients - For all Growing media picture
Coco A&B - Base Hydroponic Nutrients - For all Growing media
$259.99

Homebox Vista Small / Medium Triangle / Triangle + Grow Tent Cream PAR+ Premium  picture
Homebox Vista Small / Medium Triangle / Triangle + Grow Tent Cream PAR+ Premium
$252.87

Grodan Gro-Blocks 1
Grodan Gro-Blocks 1" Rockwool Cube (Case)
$251.58

Floraflex Floracap 4
Floraflex Floracap 4" Plastic Irrigation Cover 4 Inch Rockwool Cubes Pack of 100
$247.61

Grodan Delta 4 Rockwool Block, 3x3x2.5
Grodan Delta 4 Rockwool Block, 3x3x2.5" NO HOLE CASE 48 packs of 8
$239.99

ABSCENT COMBO PACK Medium Duffel V.2 Bag w/ Medium Insert, OD Green picture
ABSCENT COMBO PACK Medium Duffel V.2 Bag w/ Medium Insert, OD Green
$235.0

ABSCENT COMBO PACK Medium Graphite Duffel Bag w/ Medium Insert picture
ABSCENT COMBO PACK Medium Graphite Duffel Bag w/ Medium Insert
$235.0

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