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.
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Grodan Multiblocks AO 36/40 1.4"x1.4"x1.5", 98 Per Sheet
Multiblocks are designed for cuttings or seed propagation and fit in the holes cut in the larger Rockwool cubes. The blocks come in sheets cut to fit in a standard 10" x 20" propagation tray. The blocks are tapered or V shaped to create an air space below... More Details
Item Number: 111003
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Usually ships in 24 hours |
$9.55
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Usually ships in 24 hours |
$6.45
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Grodan Delta 4 Gro-Blocks 3x3x2.5 With Hole, Strip of 8
3 x 3 x 3 inch Growing Blocks with holes for smaller cubes. Used as a second stage from smaller cubes. The 1-1/2 inch round hole will accept the small cubes that come in a sheet or the wrapped cubes that come in a strip. Growing blocks are great for ebb a... More Details
Item Number: 111043
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Usually ships in 24 hours |
$4.05
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Grodan Delta 5.6 Gro-Blocks 3x3x4 With Hole, Strip of 8
3 x 3 x 4 inch Growing Blocks with holes for smaller cubes. Used as a second stage from smaller cubes. The 1-1/2 inch round hole will accept the small cubes that come in a sheet or the wrapped cubes that come in a strip. Growing blocks are great for ebb a... More Details
Item Number: 111044
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Usually ships in 24 hours |
$6.15
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Grodan Delta 8 Gro-Blocks 4x4x3 No Hole, Strip of 6
4 x 4 x 3 inch Growing Blocks without holes. Used as a second stage from smaller cubes, just place the small cube on top. Growing blocks are great for ebb and flow hydroponic systems or for use as mid stage for plants eventually going on to Rockwool slabs... More Details
Item Number: 111046
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Usually ships in 24 hours |
$5.65
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Grodan Delta 8 Gro-Blocks 4x4x3 With Hole, Strip of 6
4 x 4 x 3 inch Growing Blocks with holes for smaller cubes. Used as a second stage from smaller cubes. The 1-1/2 inch round hole will accept the small cubes that come in a sheet or the wrapped cubes that come in a strip. Growing blocks are great for ebb a... More Details
Item Number: 111047
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Usually ships in 24 hours |
$5.85
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Grodan Delta 10 Gro-Blocks 4x4x4 With Hole, Strip of 6
This is the most popular size rockwool cube. 4 x 4 x 4 inch Growing Blocks with holes for smaller cubes. Used as a second stage from smaller cubes. The 1-1/2 inch hole will accept the small cubes that come in a sheet or the wrapped cubes that come in a st... More Details
Item Number: 111048
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Usually ships in 24 hours |
$7.05
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Grodan Hugo Gro-Block 6x6x5.5, One Cube
The largest rockwool block. 6 x 6 x 6 inch Growing blocks with 1-1/2 inch hole for smaller cubes. Used for growing real big plants. These cubes work best with a drip system. In a flood system the top half can dry out quickly and lead to salt buildup so ri... More Details
Item Number: 111016
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Usually ships in 24 hours |
$2.75
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Grodan Expert 15/75 6"x3"x36" Slab, One Slab
6 x 3 x 36 inch rockwool slab. Growing Slabs are a great choice for vegetable crops or almost any plant that needs extra support at the base. Slabs come wrapped in U.V. resistant plastic that makes a good container for the roots to thrive. A 3 foot slab c... More Details
Item Number: 111024
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Usually ships in 24 hours |
$5.65
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Grodan Expert 20/75 8"x3"x36" Slab, One Slab
8 x 3 x 36 inch rockwool slab, most popular size. Growing Slabs are a great choice for vegetable crops or almost any plant that needs extra support at the base. Slabs come wrapped in U.V. resistant plastic that makes a good container for the roots to thri... More Details
Item Number: 111026
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Usually ships in 24 hours |
$7.35
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Grodan Classic 30/75 12"x3x36" Slab, One Slab
12 x 3 x 36 inch rockwool slab. Growing Slabs are a great choice for vegetable crops or almost any plant that needs extra support at the base. Slabs come wrapped in U.V. resistant plastic that makes a good container for the roots to thrive. A 3 foot slab ... More Details
Item Number: 111028
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Usually ships in 24 hours |
$10.95
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Macro Plugs, Bag of 32
The Clone Plugs fit in the round holds in the 3 and 4 inch growing blocks. They are slit so you can open them up and place your cutting inside. This will keep the cloning gel in place and help with rooting. Bag of 25
Learn About Rockwool
... More Details
Item Number: 111001
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Usually ships in 24 hours |
$5.95
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Growcubes 2 Cubic Foot bag
Growcubes are an ideal hydroponic substrate for growing many crops. Ideally suited for top irrigation (watering can or drip system), the product also performs well under ebb & flow applications. Easy to use and environmentally friendly, growcubes provide ... More Details
Item Number: 111051
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Usually ships in 24 hours |
$32.95
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Usually ships in 3 to 5 days. |
$65.02
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1-2 Week Lead Time |
$69.95
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