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Grodan 4-inch Gro Blocks are unwrapped rockwool cubes used as a soilless growing medium in hydroponic and drip-fed systems. Each block has a pre-formed top hole sized for Grodan A-OK Starters and Macroplugs, so a seedling or cutting transplants straight in. The blocks are sold as a commercial case of 144, aimed at growers running trays or tables rather than a single plant. Against coco coir and expanded clay, rockwool gives faster, cleaner rooting and more predictable water and EC behavior, but it holds less buffering for nutrients and is harder to reuse.
In stock
Lowest price we've seen: $143.86 on Nov 7 at HTG Supply. Tracked across 1 store since Nov 7.
These Grodan 4-inch Gro Blocks are made of rockwool, also called stonewool, a soilless substrate for hydroponic growing. Grodan has made its rockwool in Denmark since 1969. Rockwool is an alternative to coco coir and expanded clay.
Each block can serve as an intermediary or final container for planting. A pre-formed hole in the top holds Grodan A-OK Starters and Macroplugs snugly. The blocks are unwrapped, and the product may differ from the image.
The rockwool is improved with an advanced wetting agent for optimal fiber structure and crop uniformity. It provides improved water distribution and root growth, with more stable EC behavior in the root zone.