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Rockwool

Grodan Rockwool is made from basalt from the depths of the earth. The rock slurry is super heated, spun like cotton candy and then cut into shapes. Grodan Rockwool is one of the best in the world, made in Denmark since 1969 Grodan Rockwool (Stonewool) comes in many different shapes and sizes. Grodan stonewool (rockwool) is known for its quality, consistency and performance. You can count on the performance of Grodan as growers have used it for decades! The use of Grodan stone wool substrate offers many advantages for today's hydroponic grower. Because of the manufacturing process this growth medium is consistently high quality. The production under extreme temperature ensures that the product is clean and sterile. Its unique hydrophilic fiber also makes the cultivation on stone wool substrate very easy to control. Administering the amount of water and nutrients your plants efficiently keeps yields high, and energy consumption low. Rockwool (Stonewool) is lightweight, making it easy to use. Rock wool can be easily re-used providing a sustainable and environmentally-friendly grow medium for your hydroponic system.

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  1. 4" Cubecap

    4" Cubecap

    $0.90
    Gardeners can do away with algae and ruin the fun for fungus gnats with the pesticide-free Cubecap. The Cubecap rests on top of a coco or rockwool cube and reflects light back up to the plant, preventing it from reaching the places algae likes to grow. Its unique shape also promotes airflow around the top of the growing medium, allowing moisture to evaporate. With no moisture and no light, algae can't grow, and fungus gnats will disappear when the algae are gone. 4 inch Cubecap fits all 4 inch rockwool and coco fiber cubes. Learn More
  2. Grodan Drip Cap 6"

    Grodan Drip Cap 6"

    $3.10
    Made from recycled plastic, the DripCap is a water conservation tool and grow medium protector. Learn More
  3. Grodan Stonewool / Rockwool A'Ok Starter Plugs - 2"x2"x2" Cubes 50 Cubes

    Grodan Stonewool / Rockwool A'Ok Starter Plugs - 2"x2"x2" Cubes 50 Cubes

    $10.44
    Grodan stonewool is known for its quality, consistency and performance. Each sheet of Grodan Stonewool A'Ok Starter Plugs is perfectly-sized to fit a standard flat and each plug has a pre-formed hole to easily plant seeds and cuttings. Once rooted, gardeners can transfer individual A'Ok Starter Plugs to larger pieces of stonewool or plant them directly in soil. For any growing application, stonewool offers speed, ease of use and cleanliness. This is a single sheet of 50, two-inch square plugs. Learn More
  4. Grodan Stonewool / Rockwool A'Ok Starter Plugs 1.5" - 98 count

    Grodan Stonewool / Rockwool A'Ok Starter Plugs 1.5" - 98 count

    $12.00
    Made in Denmark since 1969, horticultural stonewool is widely recognized as an ideal growing substrate. Each Grodan A'Ok Starter Plug has a pre-formed hole to insure easy seed or cutting placement. Gardeners simply wait for plant roots to penetrate the bottom of each A'Ok Starter Plug before transplanting them into a larger stonewool cube or block. Grodan stonewool is known for its quality, consistency and performance. This is a single sheet of 98, one-and-a-half-inch plugs. Learn More
  5. Grodan Stonewool / Rockwool A-Ok Starter Plugs 1", 200/ Sheet (WHOLE CASE ONLY)

    Grodan Stonewool / Rockwool A-Ok Starter Plugs 1", 200/ Sheet (WHOLE CASE ONLY)

    $399.00
    Grodan stonewool is known for its quality, consistency and performance. Each sheet of Grodan Stonewool A-OK Starter Plugs is perfectly sized to fit a standard flat, and each plug has a preformed hole to easily plant seeds and cuttings. Once plants have rooted, gardeners can transfer individual A-OK Starter Plugs to larger pieces of stonewool or plant them directly in soil. This is a a case of 30 sheets of 200 1" plugs. Learn More
  6. Grodan Stonewool / Rockwool Agbsorbant Granulate 45 lb bag

    Grodan Stonewool / Rockwool Agbsorbant Granulate 45 lb bag

    $66.00
    Grodan Water Absorbent Granules consist of premium horticultural stonewool with a reputation for quality and performance. Particularly practical in hanging baskets or outdoor raised garden beds, gardeners can use Water Absorbent Granules as a stand alone medium or as an amendment to their favorite potting mix to improve the overall water holding capacity. Water Absorbent Granules are available in a large 45-pound bag. Learn More
  7. Grodan Stonewool / Rockwool Blocks Big Mama 8"x8"x8"

    Grodan Stonewool / Rockwool Blocks Big Mama 8"x8"x8"

    $7.50
    BIG MAMA is the largest block ever produced by Grodan. Learn More
  8. Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x2.5" W/Holes - 8 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x2.5" W/Holes - 8 pack

    $5.33
    Stonewool is recognized the world over as the ideal hydroponics growing substrate. Seeds or cuttings are started in these Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can be planted directly into containers for soil gardening as well. This is a strip of eight 3"x3" x2.5" Gro-Blocks, each with pre-formed holes. Grodan stonewool is known for its quality, consistency and performance. Learn More
  9. Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x2.5" W/O Holes - 8 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x2.5" W/O Holes - 8 pack

    $5.33
    Stonewool is recognized the world over as the ideal hydroponics growing substrate. Seeds or cuttings are started in these Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can be planted directly into containers for soil gardening as well. This is a strip of eight 3"x3" x2.5" wrapped Gro-Blocks, without pre-formed holes. Grodan stonewool is known for its quality, consistency and performance. Learn More
  10. Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x4" W/Holes - 8 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 3"x3"x4" W/Holes - 8 pack

    $7.94
    Stonewool is recognized the world over as an ideal hydroponics growing medium. Seeds or cuttings are started in these larger Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can be planted directly into containers for soil gardening as well. This is a strip of eight 3"x3"x4" Gro-Blocks, each with pre-formed holes. Grodan stonewool is known for its quality, consistency and performance. Learn More
  11. Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x2.5" W/Holes - 6 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x2.5" W/Holes - 6 pack

    $5.45
    Stonewool is recognized the world over as an ideal hydroponics growing medium. Seeds or cuttings are started in these larger Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can also be planted directly into containers for soil gardening. This is a strip of six 4"x4"x2.5" Gro-Blocks, each with pre-formed holes. Grodan stonewool is known for its quality, consistency and performance. Learn More
  12. Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x3" W/ Holes - 6 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x3" W/ Holes - 6 pack

    $7.60
    Known for its quality, consistency and ease of use, high-performance Grodan stonewool is used by hydroponics gardeners the world over. Seeds or cuttings are started in these larger Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can also be planted directly into containers for soil gardening. This is a strip of six 4"x4"x3" Gro-Blocks, each with pre-formed holes. Learn More
  13. Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x4" W/Holes - 6 pack

    Grodan Stonewool / Rockwool Gro-Blocks - 4"x4"x4" W/Holes - 6 pack

    $8.78
    Made in Denmark since 1969, Grodan stonewool is known the world over for its quality, consistency, ease of use and performance. Seeds or cuttings are started in these large Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can also be planted directly into containers for soil gardening. This is a strip of six 4"x4"x4" Gro-Blocks, each with pre-formed holes. Learn More
  14. Grodan Stonewool / Rockwool Gro-Blocks HUGO 6"x6"x6"

    Grodan Stonewool / Rockwool Gro-Blocks HUGO 6"x6"x6"

    $3.30
    Made in Denmark since 1969, horticultural stonewool is used the world over by both hydroponics and soil gardeners. Growers can start cuttings and even grow plants to maturity in this large Grodan Gro-Block or transfer it to a larger stonewool slab once roots have been established. Gro-Blocks can be planted directly into containers for soil gardening as well. This is a single 6"x6"x6" Gro-Block with a pre-formed hole. Grodan stonewool is known for its quality, consistency and performance. Learn More
  15. Grodan Stonewool / Rockwool Gro-Slab, 36" x 12" x 3", Wettest

    Grodan Stonewool / Rockwool Gro-Slab, 36" x 12" x 3", Wettest

    $14.48
    Grodan Stonewool is a proven hydroponics growing medium preferred by garden enthusiasts everywhere. This classic Delta Slab is perfect for "blocking on" smaller stonewool plugs and blocks to accommodate the final stages of plant growth. Packaged in a UV-resistant plastic poly sleeve to minimize algae formation, this is a single Delta Slab with horizontally packed fibers for better water retention.
    Grodan stonewool is known for its quality, consistency and performance. Learn More
  16. Grodan Stonewool / Rockwool Gro-Slab, 36" x 6" x 3" 2

    Grodan Stonewool / Rockwool Gro-Slab, 36" x 6" x 3"

    $7.36
    Stonewool is recognized the world over as a dependable hydroponics growing medium and Grodan stonewool in particular is known for its quality, consistency and performance. Once plants develop a healthy root system in the smaller stonewool plugs and blocks, they're transferred onto one of these larger Delta Slabs for the remainder of their growing cycle. This single Delta Slab is wrapped in a biodegradeable, UV-resistant sleeve for easy handling and algae prevention. Learn More
  17. Grodan Stonewool / Rockwool Gro-Slab, 36" x 6" x 4"

    Grodan Stonewool / Rockwool Gro-Slab, 36" x 6" x 4"

    $9.88
    Grodan Stonewool is a proven hydroponics growing medium preferred by garden enthusiasts everywhere. This 36" x 6" x 4" Delta Slab is perfect for "blocking on" smaller stonewool cubes and blocks to accommodate the final stages of plant growth. Slabs feature vertically packed fibers for quick drainage and come in a UV-resistant plastic poly sleeve. Learn More
  18. Grodan Stonewool / Rockwool Gro-Slab, 36" x 8" x 3"

    Grodan Stonewool / Rockwool Gro-Slab, 36" x 8" x 3"

    $9.60
    Grodan Stonewool is a proven hydroponics growing medium preferred by garden enthusiasts everywhere. This 36" x 8" x 3" Delta Expert Gro-Slab is perfect for "blocking on" smaller stonewool plugs and blocks to accommodate the final stages of plant growth. This single Delta Slab features vertically packed fibers for quick drainage and comes in a UV-resistant plastic poly sleeve to minimize algae formation.

    Grodan stonewool is known for its quality, consistency and performance. Learn More
  19. Grodan Stonewool / Rockwool Gro-Slab, 40" x 6" x 3"

    Grodan Stonewool / Rockwool Gro-Slab, 40" x 6" x 3"

    $8.10
    Made of the same high-quality stonewool as the larger cubes and slabs, these Grodan Grow-Chunks are a larger version of Grodan Grow-Cubes. Grow-Chunks fit any container size or shape. They offer easy irrigation and optimal root aeration, and they last throughout crop production. For any growing application, stonewool offers speed, ease of use and cleanliness. Learn More
  20. Grodan Stonewool / Rockwool Grow-Chunks, 2 cu ft

    Grodan Stonewool / Rockwool Grow-Chunks, 2 cu ft

    $39.80
    Made of the same high-quality stonewool as the larger cubes and slabs, these Grodan Grow-Chunks are a larger version of Grodan Grow-Cubes. Grow-Chunks fit any container size or shape. They offer easy irrigation and optimal root aeration, and they last throughout crop production. For any growing application, stonewool offers speed, ease of use and cleanliness. Learn More
  21. Grodan Stonewool / Rockwool Grow-Cubes  1 Cu. Ft.

    Grodan Stonewool / Rockwool Grow-Cubes 1 Cu. Ft.

    $24.53
    Made of the same high-quality stonewool as the larger cubes and slabs, these miniature Grodan Growcubes fit any container size or shape. Growcubes offer easy irrigation, optimal root aeration and last throughout crop production. For any growing application, stonewool offers speed, ease of use and cleanliness. Learn More
  22. Grodan Stonewool / Rockwool Grow-Cubes 2 Cu. Ft

    Grodan Stonewool / Rockwool Grow-Cubes 2 Cu. Ft

    $39.58
    Made in Denmark since 1969, stonewool is widely recognized as the ideal growing substrate. For any growing application, stonewool offers speed, ease of use and cleanliness. Grodan stonewool is known for its quality, consistency and performance. Growcubes in 23 gallon bag. Learn More
  23. Grodan Stonewool / Rockwool Grow-Cubes, 5.07 cu ft loose

    Grodan Stonewool / Rockwool Grow-Cubes, 5.07 cu ft loose

    $88.00
    Made of the same high-quality stonewool as the larger cubes and slabs, these miniature Grodan Grow-Cubes fit any container size or shape. Grow-Cubes offer easy irrigation and optimal root aeration, and they last throughout crop production. For any growing application, stonewool offers speed, ease of use and cleanliness. Learn More
  24. Grodan Stonewool / Rockwool Macro Plugs 50 pk

    Grodan Stonewool / Rockwool Macro Plugs 50 pk

    $10.70
    Stonewool Macroplugs are a sure bet for optimum germination. Learn More
  25. Grodan Stonewool / Rockwool Macroplugs, Round 1.5", 2000 Pack

    Grodan Stonewool / Rockwool Macroplugs, Round 1.5", 2000 Pack

    $310.00
    Made of the same high-quality stonewool as the larger cubes and slabs, these Grodan Grow-Chunks are a larger version of Grodan Grow-Cubes. Grow-Chunks fit any container size or shape. They offer easy irrigation and optimal root aeration, and they last throughout crop production. For any growing application, stonewool offers speed, ease of use and cleanliness. Learn More

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