Grodan Rockwool is a mineral wool made from molten basalt and limestone rock that is spun into cotton-candy like fibers and then compressed into cubes, blocks or slabs. Being made from natural rock, Grodan is a mineral based product used in hydroponic growing applications.
DM32 G HUGO 40/40 with hole growing blocks are individually wrapped and are ideal for small plants and transplanting. These are often referred to as a 6" cube with hole. The blocks feature grooves on the base to promote good drainage.
The blocks can be used for seeds or cuttings sowing up to medium-sized plants, these blocks can also be placed on top of a Grodan Slab for larger growing volume.