Rock wool retains water very well. So the plants can hardly dry out. Inside the fibrous material of rock wool nutrients and ions - important to make the plants thrive - are held back and can infiltrate the roots more easily and more effective.
Rock wool, also called mineral wool and Kemalit, clears away in the human lungs, in case it has been inhaled by accident. More than that, fungus and other plant diseases can't easily settle on rock wool.

Cultilène growth block, ca. 7.5 x 7.5 x 6.5cm Art.Nr: 090223 EAN: 4024102287196 In these blocks cuttings or semen can be placed. from 0,30 EUR Price per Unit: 0,40 EUR incl. 19 % Tax excl. Shipping costs   Cultilène growth block, ca. 7.5 x 7.5 x 6.5cm, small hole Art.Nr: 090221 EAN: 4024102134025 Growth block with a small hole for placing cuttings or semen. from 0,31 EUR Price per Unit: 0,40 EUR incl. 19 % Tax excl. Shipping costs   Cultilène mat of rockwool, ca. 100 x 15 x 7.5cm Art.Nr: 8003 EAN: 4024102100051 Rockwool-mats by Cultilènefor use in a libra-box. from 3,50 EUR Price per Unit: 3,85 EUR incl. 19 % Tax excl. Shipping costs