If you intend to raise seedlings or cuttings for hydroponics cultivation we recommend you use these Rockwool Propagation Cubes to start your plants in.
Rockwool Propagation Cubes have the fibres aligned vertically to allow the roots to penetrate downwards and kept in the tray the cubes will contain the main primary root until a root system has become established. Once the roots are established well you can replant your cubes into your hydroponic system or into a larger Rockwool block first if you prefer.
These 40mm cubes can be planted into soil or coco substrates but they are better suited for hydroponics and they fit inside our Rockwool grow blocks perfectly.
Rockwool is slightly alkaline so you should presoak these cubes in an acidic solution of 5.5-5.8 PH before you use them.