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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.

Grow Tent Complete Kit with Light Carbon Filter Fan Ducting Coir Growing Media picture
Grow Tent Complete Kit with Light Carbon Filter Fan Ducting Coir Growing Media
$643.5

Multi Flow Hydroponic System W/O Rocks 18 Site picture
Multi Flow Hydroponic System W/O Rocks 18 Site
$604.0

Multi Flow Hydroponic System W/O Rocks 12 Site picture
Multi Flow Hydroponic System W/O Rocks 12 Site
$528.0

Scotts Growing Media 72451180 Potting Soil, 1-Cu. Ft. picture
Scotts Growing Media 72451180 Potting Soil, 1-Cu. Ft.
$516.47

Multi Flow Hydroponic System W/O Rocks 6 Site picture
Multi Flow Hydroponic System W/O Rocks 6 Site
$449.0

Xtreme Gardening RWAO3640 98 Count 1.5
Xtreme Gardening RWAO3640 98 Count 1.5" X 1.5" Grodan A-OK Stonewool Starter Plu
$429.7

FunkSac™ - Odor Barrier Cultivation Bags Medium - Case of 1000 picture
FunkSac™ - Odor Barrier Cultivation Bags Medium - Case of 1000
$403.88

GRODAN Starter MINI-BLOCKS, 1.5
GRODAN Starter MINI-BLOCKS, 1.5", 45 Pack - Rockwool -1 CASE of 50
$399.95

LED Grow Box Stealth 2 Medium Plant Site Hydroponic Cabinet With Carbon Filter picture
LED Grow Box Stealth 2 Medium Plant Site Hydroponic Cabinet With Carbon Filter
$379.0

Quantum 4' T5 432W 8-Tube Fixture without Lamps, Medium picture
Quantum 4' T5 432W 8-Tube Fixture without Lamps, Medium
$367.42

BETAFENCE Fortinet medium h 122 rt 25 m - Mesh and post for fences picture
BETAFENCE Fortinet medium h 122 rt 25 m - Mesh and post for fences
$352.12

Coco A&B - Base Hydroponic Nutrients - For all Growing media picture
Coco A&B - Base Hydroponic Nutrients - For all Growing media
$345.99

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
$340.05

Quantum 4' T5 432W 8-Tube Fixture without Lamps, Medium picture
Quantum 4' T5 432W 8-Tube Fixture without Lamps, Medium
$295.87

Quantum 4 T5 432W 8-Tube Fixture without Lamps, Medium picture
Quantum 4 T5 432W 8-Tube Fixture without Lamps, Medium
$292.51

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

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