Grodan Rockwool 3 x3x 2.6 Inch Gro Blocks with hole – 8 Pack

Made in Denmark since 1969, Grodan rockwool (also called stonewool) is widely recognized as the ideal soilless substrate. For any growing application, rockwool offers speed, ease of use, and cleanliness. Rockwool is an alternative to coco coir and expanded clay for hydroponic applications.

• 3″ Gro Blocks can be used as an intermediary or final container for planting.
• Individually wrapped cubes hold the rockwool’s shape and prevent algae growth.
• Grodan A-OK Staters and Macroplugs fit snugly into the pre-formed hole on the top of the 3″ Gro Block.