Grodan Rockwool is a mineral wool made from molten basalt and limestone rock that is spun into cotton-candy like fibres and then compressed into cubes, blocks or slabs. Being made from natural rock, Grodan is a mineral based product used in hydroponic growing applications.
75mm Block without hole
DU 4G (Delta 4G) without hole growing blocks are individually wrapped and are ideal for small plants and transplanting. These are often referred to as a 3" cube without hole. The blocks feature grooves on the base to promote good drainage.
The blocks can be used for direct seed or clone sowing, these blocks can also be placed on top of a Grodan Slab for larger growing volume.
Grodan Delta guarantees an optimum balance of air and water. The variation of small and large pores throughout the block ensures that the roots are always supplied with sufficient air and water.
DU 4G blocks measure 3 x 3 x 2.5 inches (7.5 x 7.5 x 6cm approx.).
