Rockwool

Made from spun basalt rock fibers that are then formed into slabs or cubes, rockwool is a popular growing substrate for hydroponic gardening. Rockwool, also known as stonewool, is perfect for seed starting, ebb and flow systems, and drip irrigation hydroponic systems due to its inert properties and the fact that it does not absorb water – leaving it available to the plants for growth and development.

HTG Supply offers rockwool in a variety of options, including cubes, blocks, slabs, whatever you need to get the most out of your hydroponic garden! Order today! 

Already using rockwool a top-feed or drip system application? Check out the new Floraflex products for both hand-water or automated top-feed systems. We offer a great selection of Floracaps and other flex grow caps for rockwool blocks to help you streamline and optimize watering and feeding.

Read More

Recently Viewed products

Check back after you've done some shopping!

Newest Rockwool

Most Popular in Rockwool

6x6x6 Grodan Gro-Block Improved Rockwool Block
6 Inch Rockwool Cubes - 6x6x6 Gro Blocks
$3.73
Grodan A-Ok 1.5 Inch Starter Plugs Sheet of 98
Grodan A-Ok 1.5 Inch Starter Plugs Sheet of 98
$14.70
Rockwool / Stonewool 1.5 Inch Cubes – 45 Pack
Rockwool / Stonewool 1.5 Inch Cubes - 45 Pack
$9.46
Rockwool / Stonewool 3 Inch Gro Blocks – 8 Pack
Rockwool / Stonewool 3 Inch Gro Blocks - 8 Pack
$6.09
Rockwool / Stonewool 4 Inch Gro Blocks – 6 Pack
Rockwool / Stonewool 4 Inch Gro Blocks - 6 Pack
$10.12
Rockwool / Stonewool SLAB 6″ x 36″ x 4″
Rockwool / Stonewool SLAB 6" x 36" x 4"
$11.37
Grodan A-Ok 1 Inch Starter Plugs Sheet of 200
Grodan A-Ok 1 Inch Starter Plugs Sheet of 200
$16.25
Grodan Grow-Smart Tray Insert
Grodan Grow-Smart Tray Insert
$13.58
Rockwool Stonewool Macro Plugs – 50 Pack
Rockwool Stonewool Macro Plugs - 50 Pack
$12.16
Rockwool / Stonewool 8 Inch Big Mama Block
Rockwool / Stonewool 8 Inch Big Mama Block
$8.67
Rockwool / Stonewool Slab 8″ x 36″ x 3″
Rockwool / Stonewool Slab 8" x 36" x 3"
$11.07
Rockwool / Stonewool SLAB 6″ x 36″ x 3″
Rockwool / Stonewool SLAB 6" x 36" x 3"
$8.53
Grodan Grow Cubes – 2 Cubic Feet
Grodan Grow Cubes - 2 Cubic Feet
$45.86
Grodan Grow Cubes – 1 Cubic Foot
Grodan Grow Cubes - 1 Cubic Foot
$28.46
Sunleaves Block Covers 4.5
Sunleaves Block Covers 4.5
$11.82
Sunleaves Block Covers 6.5
Sunleaves Block Covers 6.5
$20.39

Related Articles & Videos