Cultiwool Rockwool Cube 15 x 15 x 13.5 cm

Cross grooves improve water flow underneath the block, and the black/white film prevents algae growth.

Drainage grooves

Cultiwool growing blocks have drainage grooves on the bottom to improve water flow underneath the block. This is especially useful when the blocks are placed on growing tables and concrete floors. Another advantage of blocks with drainage grooves is that they limit the contact surface with the ground. This helps prevent diseases from spreading to plants through weak roots, often combined with excessively high temperatures.