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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.

Homebox Vista Small / Medium Triangle / Triangle + Grow Tent Cream PAR+ Premium  picture
Homebox Vista Small / Medium Triangle / Triangle + Grow Tent Cream PAR+ Premium
$267.02

Gro Block Improved Medium 4
Gro Block Improved Medium 4"GR7,5 w/ hole 4"x4"3.1" Shrink/S
$258.05

Grodan Delta Big Mama Rockwool 10 Block Plant Container 4
Grodan Delta Big Mama Rockwool 10 Block Plant Container 4" x 4" x 4" Case Of 144
$256.93

CANNA Coco Brick 40l Expandable Natural Plant Medium Soil Substrate, 40 Liter picture
CANNA Coco Brick 40l Expandable Natural Plant Medium Soil Substrate, 40 Liter
$254.95

100 Pack 6
100 Pack 6" Plastic Drip Tray Cover Irrigation Smartpot Hugo Rockwool Cube Block
$249.99

Grodan Delta 4 - No Hole - 3
Grodan Delta 4 - No Hole - 3" x 3" x 2.5" Rockwool Block - Choose Your Quantity!
$249.99

2
2" Rockwool Starter Plugs, 20 Sheet of 1000 Plugs + Twin Canaries Chart
$249.99

Root Farm Felt Medium Garden Pot 24 pk picture
Root Farm Felt Medium Garden Pot 24 pk
$242.99

HF Complete Propagation Cloning Kit, Heat Mat, Tray, Humidity Dome Rockwool, GEL picture
HF Complete Propagation Cloning Kit, Heat Mat, Tray, Humidity Dome Rockwool, GEL
$241.95

Grodan Delta 10 Large Rockwool Gro Blocks 4
Grodan Delta 10 Large Rockwool Gro Blocks 4" X 4 " X 4 Inch / 1 Case = 24 Strips
$240.99

Grodan Rock Wool Cube - 15 X 15 X 14cm - Pack Of 36 - Hydroponic Growing Medium picture
Grodan Rock Wool Cube - 15 X 15 X 14cm - Pack Of 36 - Hydroponic Growing Medium
$232.25

Grodan Rock Wool Cube - 15 X 15 X 14cm - Pack Of 36 - Hydroponic Rockwool picture
Grodan Rock Wool Cube - 15 X 15 X 14cm - Pack Of 36 - Hydroponic Rockwool
$232.25

Grodan Stonewool Macro Plugs with Slit - 1.5 inch - (2000 Count) picture
Grodan Stonewool Macro Plugs with Slit - 1.5 inch - (2000 Count)
$231.53

Grodan HUGO 6 x 6 x 5 5/8 Inches G 40/40 Rockwool Gro Block w/Hole NEW picture
Grodan HUGO 6 x 6 x 5 5/8 Inches G 40/40 Rockwool Gro Block w/Hole NEW
$229.79

5 Open Top GROW BAGS with COCO Peat Coir Slab HYDROPONIC Medium  picture
5 Open Top GROW BAGS with COCO Peat Coir Slab HYDROPONIC Medium
$229.0

Integra Boost RH 55% 2 Way Humidity Control Medium 8g Gram, case of 300 picture
Integra Boost RH 55% 2 Way Humidity Control Medium 8g Gram, case of 300
$224.46

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