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Products > Growing Media > Grodan Rockwool

Rockwool is made from molten rock spun into fibers like cotton candy. It's then pressed into different shapes and cut into cubes and slabs. The cubes and slabs feel like a sponge and will not breakdown. The small Multiblocks and Miniblocks can be used for starting cuttings or seeds. After the plants grow out of the small blocks, you can place them in the holes in the larger growing locks. From there you can place them on a slab for larger plants. Although the rockwool can be heat sterilized after use and re bagged, most hobby growers just throw them away after use. The Grodan Growcubes are small squares of rockwool about the size of a sugar cube. They are used for filling pots or mixing with Hydroton for added moisture. The Granulated rockwool is also for filling pots and is less expensive than the Growcubes but does not have the same aeration.


Growing Blocks are used for small plants in a flood / drain tray

Multiblocks are used for seedlings and cuttings

Miniblocks for seedlings and cuttings

Granulated for filling pots

Hugo Blocks for larger plants, best with a drip system

Slabs for large plants watered by drip irrigation.

Growcubes in a pot

Need a full case of Rockwool?

Learn More About Rockwool.

Description (click product description for details) Price

4 Inch Rockwool Block Plastic Cover - 40 Pack

Availability: Usually ships in 24 hours

Item Number: 111005

4 Inch Rockwool Block Plastic Cover - 40 Pack
$5.95

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6 Inch Rockwool Block Plastic Cover - 40 Pack

Availability: Usually ships in 24 hours

Item Number: 111006

6 Inch Rockwool Block Plastic Cover - 40 Pack
$11.95

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Grodan Multiblocks AO 36/40 1.4"x1.4"x1.5", 98 Per Sheet

Availability: Usually ships in 24 hours

Item Number: 111003

Grodan Multiblocks AO 36/40 1.4"x1.4"x1.5", 98 Per Sheet
$10.65

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Grodan Miniblocks Delta 40/40 1.5"x1.5"x1.5", 15 Per Strip, Pack of 3 Strips

Availability: Usually ships in 24 hours

Item Number: 111040

Grodan Miniblocks Delta 40/40 1.5"x1.5"x1.5", 15 Per Strip, Pack of 3 Strips
$5.95

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Grodan Delta 4 Gro-Blocks 3x3x2.5 With Hole, Strip of 8

Availability: Usually ships in 24 hours

Item Number: 111043

Grodan Delta 4 Gro-Blocks 3x3x2.5 With Hole, Strip of 8
$3.95

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Grodan Delta 5.6 Gro-Blocks 3x3x4 With Hole, Strip of 8

Availability: Usually ships in 24 hours

Item Number: 111044

Grodan Delta 5.6 Gro-Blocks 3x3x4 With Hole, Strip of 8
$5.95

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Grodan Delta 8 Gro-Blocks 4x4x3 No Hole, Strip of 6

Availability: Usually ships in 24 hours

Item Number: 111046

Grodan Delta 8 Gro-Blocks 4x4x3 No Hole, Strip of 6
$5.95

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Grodan Delta 8 Gro-Blocks 4x4x3 With Hole, Strip of 6

Availability: Usually ships in 24 hours

Item Number: 111047

Grodan Delta 8 Gro-Blocks 4x4x3 With Hole, Strip of 6
$5.95

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Grodan Delta 10 Gro-Blocks 4x4x4 With Hole, Strip of 6

Availability: Usually ships in 24 hours

Item Number: 111048

Grodan Delta 10 Gro-Blocks 4x4x4 With Hole, Strip of 6
$6.95

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Grodan Hugo Gro-Block 6x6x5.5, One Cube

Availability: Usually ships in 24 hours

Item Number: 111016

Grodan Hugo Gro-Block 6x6x5.5, One Cube
$2.95

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Grodan Expert 15/75 6"x3"x36" Slab, One Slab

Availability: Usually ships in 24 hours

Item Number: 111024

Grodan Expert 15/75 6"x3"x36" Slab, One Slab
$6.95

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Grodan Expert 20/75 8"x3"x36" Slab, One Slab

Availability: Usually ships in 24 hours

Item Number: 111026

Grodan Expert 20/75 8"x3"x36" Slab, One Slab
$7.95

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Grodan Classic 30/75 12"x3x36" Slab, One Slab

Availability: Usually ships in 24 hours

Item Number: 111028

Grodan Classic 30/75 12"x3x36" Slab, One Slab
$11.95

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Macro Plugs, Bag of 32

Availability: Usually ships in 24 hours

Item Number: 111001

Macro Plugs, Bag of 32
$5.95

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Growcubes 2 Cubic Foot bag

Availability: Usually ships in 24 hours

Item Number: 111051

Growcubes 2 Cubic Foot bag
$34.95

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AgroDynamics Water Absorbent Granulates 45 lbs.

Availability: Usually ships in 24 hours

Item Number: 111036

AgroDynamics Water Absorbent Granulates 45 lbs.
$73.95

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AgroDynamics Water Repellent Granulates 45 lbs.

Availability: Usually ships in 3 to 5 days.

Item Number: 111037

AgroDynamics Water Repellent Granulates 45 lbs.
$87.95

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Cococan Caps 4", 10-pack

Availability: Usually ships in 24 hours

Item Number: 131561

Cococan Caps 4", 10-pack
$2.39

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Cococan Caps 6", 10-pack

Availability: Out of stock until approx. 5/2/08

Item Number: 131562

Cococan Caps 6", 10-pack
$3.10

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