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  • Hydrofarm HGCOV6 Rockwool Block Cover (40 Pack), 6"

    PLASTIC BLOCK COVERS Reflect light to plant leaves, where it' s needed most. Block light from media. Eliminate algae and mildew growth. 40 dual sided block covers per pack. Works great with GRODAN Blocks.- Block light from media - Reflect light to plant leaves - where it's needed most - Eliminate algae and mildew growth - 40 dual-sided block covers per pack.

    • ASIN: B000ICXKRA
    • Brand: Hydrofarm
    • ASIN: B000ICXKRA
    • UPC: 638104945790
    • Part No: HGCOV6

  • Hydrofarm HGCOV4 Rockwool Block Cover (40 Pack), 4"

    PLASTIC BLOCK COVERS Reflect light to plant leaves, where it's needed most. Block light from media. Eliminate algae and mildew growth. 40 dual sided block covers per pack. Works great with GRODAN Blocks.- Block light from media - Reflect light to plant leaves - where it's needed most - Eliminate algae and mildew growth - 40 dual-sided block covers per pack.

    • ASIN: B00C7Q407E
    • Brand: Hydrofarm
    • ASIN: B00C7Q407E
    • UPC: 638104945783
    • Part No: HGCOV4

  • Grower's Edge Block Covers - 4" (40/Pack)

    For blocks of Rockwool and other grow media. These grower's edge block covers blocks light from media- reducing algae and pest problems. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in diameter.

    • ASIN: B00CJIBMR6
    • Color: N/A
    • Brand: Grower's Edge
    • ASIN: B00CJIBMR6
    • UPC: 870883008376
    • Part No: 714820

  • Hydrofarm HGCOV8 Rockwool Block Cover (40 Pack), 8"

    PLASTIC BLOCK COVERS Reflect light to plant leaves, where it's needed most. Block light from media. Eliminate algae and mildew growth. 40 dual sided block covers per pack. Works great with GRODAN Blocks.- Block light from media - Reflect light to plant leaves - where it's needed most - Eliminate algae and mildew growth - 40 dual-sided block covers per pack.

    • ASIN: B00KCPJTIW
    • Brand: Hydrofarm
    • ASIN: B00KCPJTIW
    • UPC: 638104005883
    • Part No: HGCOV8

  • Grodan Starter Bundle: Grodan Delta 10 Block 4" x 4" x 4" with Hole (6 Cubes), 4" Rockwool Block Covers (6 Covers) & Grodan Macro Plugs (12 Count) + Twin Canaries Chart

    Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. Grodan comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs, if desired. Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums. Grodan Blocks - Grodan Delta blocks are the most uniform blocks available on the market. They feature improved grooves at the base to promote better drainage. They are available in a large assortment of sizes and configurations to suit all types of plants. These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants. AO 36/40 plugs fit well into the hole sizes provided by the blocks. The blocks can then be placed on top of a slab to provide for a larger growing volume. Hugo is the largest of the growing blocks. It provid...

    • ASIN: B06XTTVSTM
    • Brand: The Hydroponic City
    • ASIN: B06XTTVSTM

  • 2 Pack Bundle: Grodan Delta 10 Block 4" x 4" x 4" with Hole (6 Cubes) & 4" Rockwool Block Covers (6 Covers) + Twin Canaries Chart

    Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. Grodan comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs, if desired. Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums. Grodan Blocks - Grodan Delta blocks are the most uniform blocks available on the market. They feature improved grooves at the base to promote better drainage. They are available in a large assortment of sizes and configurations to suit all types of plants. These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants. AO 36/40 plugs fit well into the hole sizes provided by the blocks. The blocks can then be placed on top of a slab to provide for a larger growing volume. Hugo is the largest of the growing blocks. It provid...

    • ASIN: B06XTTVRCV
    • Brand: The Hydroponic City
    • ASIN: B06XTTVRCV

  • FLORACAP 10 Pack of 4 X 4" FloraFlex Cover Your Rockwool Cubes Blocks

    Place the revolutionary FloraCapson your 4", Rockwool cubes and maximize your space in the vegetative cycle. 17 flower-designed louvers block light while allowing air, water, and nutrients to your plants. The FloraCapwas designed with the vegetative state in mind but has proven a worthy tool for the avid top feeder throughout the flowering stage as well.Eliminates algae and the use of pesticides by covering the media. -17 flower-designed louvers. -Built-in overflow system where excess water and nutrients are delivered straight to the rootball. -360° bottom lip directs all water and nutrients to your plant. -Four three-way stakes on the bottom for extra stability. -Holes in all four corners for leftover water drainage. -Stackable. -Reusable. -BPA and lead-free plastic.

    • ASIN: B07CCGKMFQ
    • Brand: FLORACAP
    • ASIN: B07CCGKMFQ
    • UPC: 686912194794

  • Coco Cultivate 6" Block Cover Cap with Hole (40)

    Coconut fiber promotes plant health and is extremely eco-friendly. These 100% natural coconut coir fiber covers work great for preventing algae from growing on top of your Rockwool blocks. Coconut coir has an outstanding water-holding capacity (it can absorb 8 times its own weight in water) and the fibers act like mini-sponges, retaining water for long periods of time while releasing nutrients in ideal increments. The result of those benefits is more vigorous plant growth. Coconut coir is attractive because it's a byproduct of the coconut industry that is not eaten or used as fuel, and on top of that, it actually promotes plant health. Coconut coir has an outstanding water-holding capacity (it can absorb 8 times its own weight in water) and the fibers act like mini-sponges, retaining water for long periods of time while releasing nutrients in ideal increments. The result of those benefits is more vigorous plant growth.

    • ASIN: B06X3XHPH6
    • Brand: Coco Cultivate
    • ASIN: B06X3XHPH6
    • UPC: 748006942541

  • FloraFlex FloraCap Plastic Block Cover - 8-Inch - Pack of 3

    Place the revolutionary FloraCapsTM on your 8" Rockwool cubes and maximize your space in the vegetative cycle. 17 flower-designed louvers block light while allowing air, water, and nutrients to your plants. The FloraCapTM was designed with the vegetative state in mind but has proven a worthy tool for the avid top feeder throughout the flowering stage as well. Eliminates algae and the use of pesticides by covering the media.

    • ASIN: B06XD575L6
    • Color: Green
    • Brand: FFloraFlex
    • ASIN: B06XD575L6
    • UPC: 851054006605
    • Part No: 121

  • FloraFlex FloraCap Plastic Block Cover - 4-Inch - Pack of 3

    Place the revolutionary FloraCapsTM on your 4" Rockwool cubes and maximize your space in the vegetative cycle. 17 flower-designed louvers block light while allowing air, water, and nutrients to your plants. The FloraCapTM was designed with the vegetative state in mind but has proven a worthy tool for the avid top feeder throughout the flowering stage as well. Eliminates algae and the use of pesticides by covering the media.

    • ASIN: B06XD45B3B
    • Color: Green
    • Brand: FFloraFlex
    • ASIN: B06XD45B3B
    • UPC: 851054006629
    • Part No: 127

  • 6 in. Rockwool Block Cover - Pack of 40

    • ASIN:
    • Model: HGCOV6
    • Color: Other

  • Hydrofarm HGCOV8 Rockwool Block Cover (40 Pack), 8"

    • ASIN:
    • Category: Hydroponic Parts & Accessories