Grodan 1.5" x 1.5" x 1.5" 45 Mini Blocks Strip w/ Holes rockwool stonewool cubes
Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Seedlings started in cubes are easily transferred to blocks and then onto slabs, if desired.