RedRock 6″ Stone Wool Grow Slabs

Starting At: $89.95


The RedRock 6" Grow Slabs are commercial-grade rockwool slabs sourced from US-made raw materials. These stone slabs are designed to hold plants previously transplanted into grow blocks, once rooted just place grow blocks on top of the 6" grow slabs to expand water and nutrient access. The RedRock grow slab also supports further root zone development, giving plants more surface area to extend their root system.  

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RedRock Stone Wool 6″ Grow Slabs

High-density material offers ample support and water retention for plants of any size, and ensures that the slabs will maintain their shape during handling. Sterile, UV-blocking wrapper protects roots and fits tightly to keep water and nutrients in their root zone. Specially-developed wetting agent provides efficient, uniform saturation and optimized nutrient uptake with a water holding capacity of 80-90%. Pre-cut squares ensure perfectly uniform, repeatable spacing for grow blocks-no measuring or guesswork required. RedRock Blocks, Slabs, and Plugs are manufactured from at least 70% recycled material.

Specifications and Packaging:

  • Moisture Retention: Stone wool has high moisture retention.
  • Nutrient Content: Holds hydroponic nutrients post-hydration.
  • Oxygen Availability: High-If allowed to drain the material allows for excellent oxygen to roots.
  • pH and EC: High. pH can become very basic pH testing should be done periodically.
  • Durability: High. Does not decompose.
  • Areas of use: Hydroponic systems (floor and drain)
  • Crops: Supports multiple crop types through the entire growth cycle.
  • Upcycling: Can be sterilised and reused for couple of seasons, or shredded and used as soil conditioner.

RedRock Grow Slab – 90 x 15 x 7.5 cm – 36-Inch x 6-Inch x 3-Inch (16/Cs) (16 Cs/Plt)

  • 16/Case
  • 16 Cases/Pallet (192 slabs)

How to Use:

  1. RedRock slabs are ultra-durable and made from premium material, but they should still be handled with care; Always keep mineral wool dry until use.
  2. Place the slabs in your grow trays and spray down the mineral wool with nutrient solution through the pre-cut squares until saturated. Let them soak without draining for a minimum of 30 minutes.
  3. When you’re ready for planting, cut drainage slits in the bottom of the slabs to prevent over-watering, then place your plants’ grow blocks directly onto the pre-cut squares.
  4. As your fertigation system circulates nutrients and water to your plants, RedRock’s specialized wetting agent will deliver it evenly throughout your plants’ root zone.



Product Category

Soil & Grow Mediums


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