RedRock Starter Block PRO w/ 42/40 Hole - 10x10x10cm -4-Inch x 4-Inch x 4-Inch (144/Cs) CASE

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Sale price$130.00 Regular price$194.99


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RedRock Starter Block w/ 42/40 Hole – 10x10x10cm

Commercial grade 4 inch stonewool starter blocks manufactured in North America.
  • Our Stone wool starter blocks are sourced and manufactured in North America
  • Wetting agent ensures nutrients are immediately plant available
  • The high fiber density of the stone wool starter blocks makes better use of water and fertilizers while allowing dry back
  • Our stone wool starter blocks are priced for commercial agriculture production
  • Sizes available for any crop
  • RedRock stone wool starter blocks are processed in Canada
  • This white label product was sold to the largest cultivators in North America for years and is now available to you
42/40 Hole - 10x10x10cm - 4-Inch x 4-Inch x 4-Inch


It is common to find propagators moving fresh cuttings into plugs for the initial stage of development. Once rooted plants are transplanted into stone wool grow blocks and then placed ontop of grow slabs to extend root zone development and access to water and nutrients. Selecting the correct substrate for your crop depends on many variables such as size, duration, density, and more.
Stone wool starter blocks have high moisture retention.
Nutrient content
Once treated, stone wool starter blocks will hold nutirent content
Oxygen Availability
97% when dry but rapidly hydrates. If allowed to drain the stone wool starter blocks allows for excellent oxygen to roots.
pH and EC
Stone wool has neutral pH, but can be controlled.
Stone wool is highly durable and does not decompose
Areas of use
Hydroponic systems ( floor and drain).
Can be sterilised and reused for couple of seasons, or shredded and used as soil conditioner.
Supports multiple crop types through all stages of growth.

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