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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



1 Inch Grodan Rockwool Cubes, Sheet of 100 picture

1 Inch Grodan Rockwool Cubes, Sheet of 100

$15.49



HYDROTON Clay Pebbles Growing Media Expanded Clay Rocks You Save Choose in LITER picture

HYDROTON Clay Pebbles Growing Media Expanded Clay Rocks You Save Choose in LITER

$24.94



Grodan 1.5

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

$7.25



SALE 5000G Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media picture

SALE 5000G Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media

$20.99



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



HYDROTON - Original Hydroton® Expanded Clay Pebbles choose your Volume by Pound picture

HYDROTON - Original Hydroton® Expanded Clay Pebbles choose your Volume by Pound

$29.95



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 1

Grodan 1"x1" Sheet of 200 Rockwool

$16.69



Mother Earth Hydroton Original Clay Pebbles - 25 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 25 Liter

$27.09



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

QUALITY PERLITE FOR SEED STARTING MEDIUM FINE NURSERY POTTING GARDEN PLANTS

$9.00



24 Pack WRAPPED Grodan Rockwool Starter Cubes Mini-Blocks 2

24 Pack WRAPPED Grodan Rockwool Starter Cubes Mini-Blocks 2" x 2" x 1.5"

$13.79



QUALITY VERMICULITE FOR SEED STARTING MEDIUM FINE POTTING GARDEN REPTILE BEDDING picture

QUALITY VERMICULITE FOR SEED STARTING MEDIUM FINE POTTING GARDEN REPTILE BEDDING

$13.50



Clean Coconut Husk Chips 100% Husk fiber Orchids Anthodium Growing Medium   picture

Clean Coconut Husk Chips 100% Husk fiber Orchids Anthodium Growing Medium

$44.98



2-Pcs Coco Coir Brick Coconut 5KG Growing Media Fiber Potting Soil Plant Organic picture

2-Pcs Coco Coir Brick Coconut 5KG Growing Media Fiber Potting Soil Plant Organic

$38.99



10 LBS Clay Pebbles Grow Media Expanded Rocks Hydroponic Aquaponic  Hydroton 14L picture

10 LBS Clay Pebbles Grow Media Expanded Rocks Hydroponic Aquaponic Hydroton 14L

$29.95



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



QUALITY PERLITE AND VERMICULITE  SEED STARTING MEDIUM FINE HALF GALLON OF EACH picture

QUALITY PERLITE AND VERMICULITE SEED STARTING MEDIUM FINE HALF GALLON OF EACH

$16.99



Coco Coir SuperGrowMix TM Grow Media picture

Coco Coir SuperGrowMix TM Grow Media

$14.95



Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media 5KG / 650G picture

Coco Coir Brick Coconut Fiber Potting Soil Garden Plant Growing Media 5KG / 650G

$14.99