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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.

Growing Kit - Complete All-In-One Indoor Grow System for Small/Medium Rooms picture
Growing Kit - Complete All-In-One Indoor Grow System for Small/Medium Rooms
$579.95

Satco S29391 Multi Pack 22W LED HID  Light Medium Bulbs High Lumen Lamps Volts   picture
Satco S29391 Multi Pack 22W LED HID Light Medium Bulbs High Lumen Lamps Volts
$552.0

FoxFarm Performance Pack Complete Nutrient Kit - Medium w/Big Bloom, Grow Big + picture
FoxFarm Performance Pack Complete Nutrient Kit - Medium w/Big Bloom, Grow Big +
$549.0

Satco S9678 MULTI PACK 18W Amber LED Turtle Season Safe Medium High Lumen HID  picture
Satco S9678 MULTI PACK 18W Amber LED Turtle Season Safe Medium High Lumen HID
$520.99

GROWT Home & Kitchen Features GMC10L Clay Pebbles Liter Bag, 4mm-16mm picture
GROWT Home & Kitchen Features GMC10L Clay Pebbles Liter Bag, 4mm-16mm
$511.84

Floraflex Floracap 7.5
Floraflex Floracap 7.5"-12" Inch ROUND Rockwool Irrigation Cover 3pk 12pk OR 50
$479.95

Floraflex Floracap 8
Floraflex Floracap 8" Plastic Irrigation Cover 8 Inch Rockwool Cubes Pack of 100
$479.23

Satco S9397 MULTI PACK 120W LED HID Light Medium Bulbs High Lumen Lamps Volts  picture
Satco S9397 MULTI PACK 120W LED HID Light Medium Bulbs High Lumen Lamps Volts
$435.99

Satco S9397 MULTI PACK 120W LED HID Light Medium Bulbs High Lumen Lamps Volts  picture
Satco S9397 MULTI PACK 120W LED HID Light Medium Bulbs High Lumen Lamps Volts
$435.99

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

General Hydroponics Rapid Rooter Plugs Propagation Medium -  1400 Case picture
General Hydroponics Rapid Rooter Plugs Propagation Medium - 1400 Case
$392.0

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

Root Riot Starter Cubes Propagation Medium - 1400 Pack picture
Root Riot Starter Cubes Propagation Medium - 1400 Pack
$372.0

Satco S9396 MULTI PACK 100W LED HID Light Medium Bulbs High Lumen Lamps Volts picture
Satco S9396 MULTI PACK 100W LED HID Light Medium Bulbs High Lumen Lamps Volts
$365.99

Satco S9396 MULTI PACK 100W LED HID Light Medium Bulbs High Lumen Lamps Volts picture
Satco S9396 MULTI PACK 100W LED HID Light Medium Bulbs High Lumen Lamps Volts
$365.99

Various Sizes Boveda Humidipak 58% Bulk Micro 4 Gram Medium 8 Gram Large 67 Gram picture
Various Sizes Boveda Humidipak 58% Bulk Micro 4 Gram Medium 8 Gram Large 67 Gram
$349.95

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