Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different t

These rockwool plant starting plugs feature a slit for easy insertion of rooted cuttings. They fit perfectly into the holes of any standard rockwool blocks, inserted into pebbles, or any other type of growing media.