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Rockwool

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Rockwool

What is rockwool for hydroponics?

Rockwool, commonly referred to as stonewool, is a hydroponic growing medium derived from basalt. This is one of the more common soilless options indoor hydroponic growers choose, and rightfully so, as it has a number of benefits.

Commercial growers often claim rockwool is the ideal substrate for growing hydroponically, due to its ability to hold water while retaining sufficient aeration. Rockwool drains very slowly, allowing for a precise manipulation of hydroponic nutrient dosing between vegetative and flowering cycles. Most rockwool comes packaged very dry, and thus growers need to pre-soak it in water before planting. It is also important to avoid overwatering with rockwool to prevent algae growth.

What are the benefits of rockwool for plants?

So, now that we've addressed the common question of "what is rockwool?", it's time to move onto your next question - why do so many growers prefer rockwool for plants? It's because this porous grow media comes with all sorts of enticing benefits. From water retention to oxygenation, cost savings, sterility, and more, here are the most common benefits of rockwool for plants.

  • Rockwool holds water well, but doesn't absorb much of it, making more available for your plant's root system
  • It is a well aerated growing medium, proving sufficient oxygen to the root zone.
  • Lightweight, saving on shipping costs, but still stronger than other hydroponic growing mediums.
  • Rockwool provides a sterile growing environment.
  • Once you are done with one grow, you can keep using your rockwool cubes!

Rockwool is not without drawbacks, however. It can be very hard to dispose of, since it doesn't break down. It is also important to adjust the pH of your rockwool when you get it, as rockwool tends to have a high natural pH.

What are the different types of rockwool for hydroponics?

Rockwool comes in a number of shapes, and since it easily breaks apart, it can be formed into any size necessary. The most common types of rockwool are:

  • Cubes
  • Starter plugs
  • Blocks
  • Slabs

Rockwool starting plugs and rockwool cubes are great for seed starting, and can be used through the life of the plant. Once roots begin to pop out of the plug or cube, growers can simply transmit the cube right into a net pot or other hydroponic container

Who should use rockwool for plants?

We recommend intermediate growers use rockwool as their hydroponic grow medium. Rockwool requires regular watering and feeding, and it retains moisture well, but it can be tricky to find the sweet spot. The rockwool should be damp, but not soaked. If you are germinating, you cannot go wrong with rockwool.

With that said, though, this grow media is really great for all types of growers. Whether you grow indoors or outdoors, in soil or hydroponics - you can always start your plants in rockwool cubes or plugs before transplanting them into a larger pot with soil, or into your hydroponic system. These rockwool cubes and plugs offer the perfect conditions to get your plants started off on the right foot.

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  • Grodan Gro-Block Improved Mini-Block, 2" - Case of 1440 Grodan Gro-Block Improved Mini-Block, 2" - Case of 1440 - Hydroponics

    Grodan Gro-Block Improved Mini-Block, 2" - Case of 1440

    Grodan

    MSRP: $579.75
    $474.79
      Grodan Product Documents Grodan Starter Mini-Blocks Safety Data Sheet Grodan Starter Mini-Blocks Mini-Blocks™ sit in a tray (flat) without support for easy starting of seeds and cuttings. These Mini-Blocks are individually wrapped in white...
    MSRP: $579.75
    $474.79
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    MSRP: $579.75
    $474.79
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  • Grower's Edge Block Covers, 6 in

    Grower's Edge Block Covers, 6 in

    Growers Edge

    MSRP: $23.12
    $18.56
    For blocks of rockwool and other grow media. These Grower's Edge Block Covers blocks light from media?ùwhich helps reduce algae. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in...
    MSRP: $23.12
    $18.56
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    MSRP: $23.12
    $18.56
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  • Grower's Edge Block Covers, 4 in

    Grower's Edge Block Covers, 4 in

    Growers Edge

    MSRP: $13.41
    $12.87
    For blocks of rockwool and other grow media. These Grower's Edge Block Covers blocks light from media?ùwhich helps reduce algae. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in...
    MSRP: $13.41
    $12.87
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    MSRP: $13.41
    $12.87
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  • Grodan Gro-Block Improved Mini-Block, 1.5" - Case of 2250 Grodan Gro-Block Improved Mini-Block, 1.5" - Case of 2250 - Hydroponics

    Grodan Gro-Block Improved Mini-Block, 1.5" - Case of 2250

    Grodan

    $525.24
      Grodan Product Documents Grodan Starter Mini-Blocks Safety Data Sheet Grodan Starter Mini-Blocks Mini-Blocks™ sit in a tray (flat) without support for easy starting of seeds and cuttings. These Mini-Blocks are individually wrapped in white...
    $525.24
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  • Grodan Delta Hugo with Hole, 6" x 6" x 6" - Case of 64

    Grodan Delta Hugo with Hole, 6" x 6" x 6" - Case of 64

    Grodan

    MSRP: $248.33
    $206.95
      Grodan Product Documents Grodan Delta Product Data Sheet Grodan Delta Safety Data Sheet The Foundation for uniform and perfectly controllable propagation of plants. Details Grodan Delta is the basis for an easy to steer propagation process,...
    MSRP: $248.33
    $206.95
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    MSRP: $248.33
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  • Grodan Delta 6.5 with Hole, 4" x 4" x 2.5" - Case of 36 Grodan Delta 6.5 with Hole, 4" x 4" x 2.5" - Case of 36 - Hydroponics

    Grodan Delta 6.5 with Hole, 4" x 4" x 2.5" - Case of 36

    Grodan

    MSRP: $238.81
    $226.87
      Grodan Product Documents Grodan Delta Product Data Sheet Grodan Delta Safety Data Sheet The Foundation for uniform and perfectly controllable propagation of plants. Details Grodan Delta is the basis for an easy to steer propagation process,...
    MSRP: $238.81
    $226.87
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    MSRP: $238.81
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  • Grodan Delta 5.6 with Hole, 3" x 3" x 4" - Case of 32 Grodan Delta 5.6 with Hole, 3" x 3" x 4" - Case of 32 - Hydroponics

    Grodan Delta 5.6 with Hole, 3" x 3" x 4" - Case of 32

    Grodan

    MSRP: $306.71
    $194.33
      Grodan Product Documents Grodan Delta Product Data Sheet Grodan Delta Safety Data Sheet The Foundation for uniform and perfectly controllable propagation of plants. Details Grodan Delta is the basis for an easy to steer propagation process,...
    MSRP: $306.71
    $194.33
    Qty in Cart: 0
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    MSRP: $306.71
    $194.33
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  • Grodan Pargro QD Jumbo Block with Hole, 6" x 6" x 4" Grodan Pargro QD Jumbo Block with Hole, 6" x 6" x 4" - Hydroponics

    Grodan Pargro QD Jumbo Block with Hole, 6" x 6" x 4"

    Grodan

    MSRP: $183.85
    $150.48
    Grodan Product Documents Grodan Pargro Safety Data Sheet Pargro Quick Drain Stonewool Grodan Pargro line has been modified to be the driest value-priced Rockwool on the market. Pargro is the leader among affordable horticultural Rockwool. There are...
    MSRP: $183.85
    $150.48
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  • Grodan Expert Slab, 8" x 3" x 36" - Case of 12 Grodan Expert Slab, 8" x 3" x 36" - Case of 12 - Hydroponics

    Grodan Expert Slab, 8" x 3" x 36" - Case of 12

    Grodan

    MSRP: $138.76
    $133.33
    Grodan Product Documents Grodan Stonewool Growth Slabs MSDS Grodan Stonewool Gro-Slabs Gro-Slabs provide the final stage for growing a spectacularly large plant. Transplant your Gro-Block™ plant onto a slab just like professional growers. They come in...
    MSRP: $138.76
    $133.33
    Qty in Cart: 0
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    MSRP: $138.76
    $133.33
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  • Grodan Expert Slab, 6" x 3" x 36"" - Case of 12 Grodan Expert Slab, 6" x 3" x 36"" - Case of 12 - Hydroponics

    Grodan Expert Slab, 6" x 3" x 36"" - Case of 12

    Grodan

    MSRP: $107.25
    $103.85
    Grodan Product Documents Grodan Stonewool Growth Slabs MSDS Grodan Stonewool Gro-Slabs Gro-Slabs provide the final stage for growing a spectacularly large plant. Transplant your Gro-Block™ plant onto a slab just like professional growers. They come in...
    MSRP: $107.25
    $103.85
    Qty in Cart: 0
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    MSRP: $107.25
    $103.85
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  • Grodan Expert Fat Slab, 6" x 4" x 36" - Case of 12 Grodan Expert Fat Slab, 6" x 4" x 36" - Case of 12 - Hydroponics

    Grodan Expert Fat Slab, 6" x 4" x 36" - Case of 12

    Grodan

    MSRP: $142.99
    $133.24
    Grodan Product Documents Grodan Stonewool Growth Slabs MSDS Grodan Stonewool Gro-Slabs Gro-Slabs provide the final stage for growing a spectacularly large plant. Transplant your Gro-Block™ plant onto a slab just like professional growers. They come in...
    MSRP: $142.99
    $133.24
    Qty in Cart: 0
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    Price:
    MSRP: $142.99
    $133.24
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  • Grodan Grow-Cubes, 5.6 cu. ft. - Loose in box Grodan Grow-Cubes, 5.6 cu. ft. - Loose in box - Hydroponics

    Grodan Grow-Cubes, 5.6 cu. ft. - Loose in box

    Grodan

    $163.11
      Grodan Product Documents Grodan Grow Cubes MSDS Grodan Gro-Cubes Grow-Cubes are small loose 1/2 in cubes of stonewool. Advantages are better aeration, maximum drainage so that you can hardly ever overwater your plant, easy mixing with other...
    $163.11
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    $163.11
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