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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

$22.95



Mother Earth Hydroton Original Clay Pebbles - 10 Liter picture

Mother Earth Hydroton Original Clay Pebbles - 10 Liter

$18.26



5kg Potting Soil Brick Cultivation Coconut Fibers  Coir Fibers Growing Media USA picture

5kg Potting Soil Brick Cultivation Coconut Fibers Coir Fibers Growing Media USA

$21.88



QUALITY MEDIUM COARSE GRADE VERMICULITE FOR SEED STARTING MEDIUM GARDEN BEDDING picture

QUALITY MEDIUM COARSE GRADE VERMICULITE FOR SEED STARTING MEDIUM GARDEN BEDDING

$14.95



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

Grodan Rockwool Cubes (1. 5 Inches) 49 Cubes

$12.52



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



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

QUALITY MEDIUM COARSE PERLITE FOR SEED STARTING NURSERY POTTING GARDEN PLANTS

$14.95



Coconut Coir - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---5 Cups  picture

Coconut Coir - Coco Peat ORGANIC GROWING MEDIA POTTING SOIL---5 Cups

$6.75



PGN Clay Pebbles for Hydroponic Growing - 5 Liters (2 Pounds) picture

PGN Clay Pebbles for Hydroponic Growing - 5 Liters (2 Pounds)

$12.85



4 LBS HYDROTON Clay Pebbles Hydroponic Expanded Rocks  picture

4 LBS HYDROTON Clay Pebbles Hydroponic Expanded Rocks

$16.95



FREE GIFT Prostar Gro Rockwool Cubes 1.5'' Growing Medium (40 PCs) FREE Scissor* picture

FREE GIFT Prostar Gro Rockwool Cubes 1.5'' Growing Medium (40 PCs) FREE Scissor*

$9.89



Grodan 1.5

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

$5.49



CASE of Grodan AO 36/40 6/15 Cubes 1.5x1.5

CASE of Grodan AO 36/40 6/15 Cubes 1.5x1.5" 30 sheets of 98 A-OK

$373.12



Coconut Husk Chips Husk fiber Orchids Anthodium Growing Medium  1Kg picture

Coconut Husk Chips Husk fiber Orchids Anthodium Growing Medium 1Kg

$180.00



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

$22.99



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



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

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

$11.99



2pc 650G Coco Coir Bricks Coconut Fiber Organic Potting Soil Plant Growing Media picture

2pc 650G Coco Coir Bricks Coconut Fiber Organic Potting Soil Plant Growing Media

$11.99



5kg 650g Coco Coir Bricks Coconut Fiber Potting Soil Plant Organic Growing Media picture

5kg 650g Coco Coir Bricks Coconut Fiber Potting Soil Plant Organic Growing Media

$43.48