Grodan Blocks - Rockwool -Strips 4x4x4 with 1.5 inch holes

Grodan blocks are the most uniform blocks available on the market. They feature improved grooves at the base to promote better drainage. They are available in a large assortment of sizes and configurations to suit all types of plants.

These blocks are used for direct sowing or "blockin on". The blocks can be placed on top of a slab to provide for a larger growing volume.

These blocks are sterile and give you a very clean medium to start your plants.