RedRock Starter Block PRO w/ 42/40 Hole - 4-Inch x 4-Inch x 4-Inch (Single)

RedRock Grow Blocks are the rockwool of choice for commerical cultivators.  RedRock has been sold to North America's largest farms and cultivators with two things in mind - Crop yield and cost.  

Commercial grade rockwool grow blocks manufactured from high-grade US made raw material.  

• Rockwool/stonewool is made in the USA
• Wetting agent ensures nutrients are immediately plant available
• High fiber density makes better use of water and fertilizers while allowing dry back
• Priced for commercial agriculture production
• Sizes available for any crop 
• 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