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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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Grodan 1.5

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

$7.25



 HYDROTON Clay Pebbles Grow Media Expanded Clay Rocks for Hydroponic Aquaponic  picture

HYDROTON Clay Pebbles Grow Media Expanded Clay Rocks for Hydroponic Aquaponic

$24.98



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

Clay Pebbles HYDROTON Growing Media Expanded Clay Rocks for Hydroponic systems

$6.45



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

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

$12.94



1 Inch Grodan Rockwool Cubes, Sheet of 100 picture

1 Inch Grodan Rockwool Cubes, Sheet of 100

$13.43



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

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

$14.99



Cyco Hydro Clay Lightweight Expanded Clay Pebbles - Hydroponics picture

Cyco Hydro Clay Lightweight Expanded Clay Pebbles - Hydroponics

$16.99



Grodan Round Rockwool 1.5

Grodan Round Rockwool 1.5" Macro Plugs ( 5, 25, 50, 100 ) - Slit Included

$11.75



Organic Coco Coir Bricks lot 1-16 Coconut Fiber Growing Medium Potting Soil Pets picture

Organic Coco Coir Bricks lot 1-16 Coconut Fiber Growing Medium Potting Soil Pets

$14.75



4L Liters HYDROTON Clay Pebbles Hydroponic Expanded Rocks  LOW COST picture

4L Liters HYDROTON Clay Pebbles Hydroponic Expanded Rocks LOW COST

$16.95



Grodan 1

Grodan 1" AO Rockwool Starter Plugs Cubes 200 count - hydroponic aquaponic media

$19.75



PERLITE (FAST SHIP) QUALITY COURSE- MEDIUM SEED STARTING NURSERY POTTING PLANTS picture

PERLITE (FAST SHIP) QUALITY COURSE- MEDIUM SEED STARTING NURSERY POTTING PLANTS

$5.95



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

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes

$15.89



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



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



PERLITE 2 gallons  SEED STARTING MEDIUM FINE GRADE GARDEN PLANTS (FAST SHIP) picture

PERLITE 2 gallons SEED STARTING MEDIUM FINE GRADE GARDEN PLANTS (FAST SHIP)

$19.75



PERLITE 1 gallon MEDIUM-FINE GRADE NURSERY GARDEN PLANTS SEED STARTING FASTSHIP picture

PERLITE 1 gallon MEDIUM-FINE GRADE NURSERY GARDEN PLANTS SEED STARTING FASTSHIP

$10.97



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

QUALITY VERMICULITE FOR SEED STARTING MEDIUM FINE POTTING GARDEN REPTILE BEDDING

$74.50



100% COCO COIR PEAT - ORGANIC HYDROPONIC GROWING MEDIA POTTING SOIL MICROGREENS picture

100% COCO COIR PEAT - ORGANIC HYDROPONIC GROWING MEDIA POTTING SOIL MICROGREENS

$19.99



12L Hydro Clay Balls Organic Premium Hydroponic Expanded Plant Growing Medium US picture

12L Hydro Clay Balls Organic Premium Hydroponic Expanded Plant Growing Medium US

$25.99