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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 S29391 22W 5000K Medium E26 Base Energy Saving LED HID White Light Bulb picture
SATCO S29391 22W 5000K Medium E26 Base Energy Saving LED HID White Light Bulb
$336.99

Grodan Stonewool Delta 4 - 3 in. Gro-Blocks - Without Hole - 384 Blocks Per Case picture
Grodan Stonewool Delta 4 - 3 in. Gro-Blocks - Without Hole - 384 Blocks Per Case
$336.88

Satco S9392 MULTI PACK 36W LED HID Light Medium Bulbs High Lumen Lamps Volts 1  picture
Satco S9392 MULTI PACK 36W LED HID Light Medium Bulbs High Lumen Lamps Volts 1
$326.99

Grodan A Ok Stonewool Cubes 1.5L x 1.5W x 1.5H Inches - 30 Sheets of 98 picture
Grodan A Ok Stonewool Cubes 1.5L x 1.5W x 1.5H Inches - 30 Sheets of 98
$305.82

Grodan Rockwool Cubes (1 inch) 200 Cubes Per Sheet, Case of 30 picture
Grodan Rockwool Cubes (1 inch) 200 Cubes Per Sheet, Case of 30
$302.98

COOLAROO Shade Fabric 90% UV Protection for People, PET, OR Home Medium and... picture
COOLAROO Shade Fabric 90% UV Protection for People, PET, OR Home Medium and...
$302.45

COOLAROO Shade Fabric 90% UV Protection for People, PET, OR Home Medium and... picture
COOLAROO Shade Fabric 90% UV Protection for People, PET, OR Home Medium and...
$301.46

Grodan A-OK 2
Grodan A-OK 2" x 2" Cubes FULL CASE 30 sheets of 50 Rockwool SAVE $ W/ BAY HYDRO
$299.95

Restaurant & Commercial Microgreen Starter, LED's Trays Seeds & Media 100+ crops picture
Restaurant & Commercial Microgreen Starter, LED's Trays Seeds & Media 100+ crops
$299.0

General Hydroponics Rainforest 66 Aeroponic System for Medium to Large Size... picture
General Hydroponics Rainforest 66 Aeroponic System for Medium to Large Size...
$288.84

Botanicare CNS17 Grow & Bloom for ALL MEDIA - hydroponics soil coco nutrients picture
Botanicare CNS17 Grow & Bloom for ALL MEDIA - hydroponics soil coco nutrients
$279.9

Floraflex Floracap 8
Floraflex Floracap 8" Plastic Irrigation Cover 8 Inch Rockwool Cubes Pack of 50
$279.19

Floraflex Floracap 8
Floraflex Floracap 8" Inch Plastic Irrigation Cover Rockwool Cube 3pk 12pk OR 50
$278.95

General Organics GO Pack Complete Organic Nutrient Kit - Medium picture
General Organics GO Pack Complete Organic Nutrient Kit - Medium
$275.0

SATCO S9678 TurtleSeason Safe Medium Base 18W Energy Saving LED Amber Light Bulb picture
SATCO S9678 TurtleSeason Safe Medium Base 18W Energy Saving LED Amber Light Bulb
$273.99

Canna Coco Brick 40L Expanded - Soil Medium Substra RHP 40 Liters - 1-15 packs picture
Canna Coco Brick 40L Expanded - Soil Medium Substra RHP 40 Liters - 1-15 packs
$261.73

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