[GRODAN] Rockwool cube on tray - 36x36x40

Middle of hydroponics par excellence, used in professional horticulture (cheap, reusable and sterile), rock wool is the substrate that has long been proven:

- optimal oxygenation at the root level;

- Good water and nutrient retention

- anti-pride ownership;

- Avoid transplanting shocks (the cubes fit into each other).

Nevertheless, rock wool requires some precautions for use, especially in the dry state. The ports of the mask and gloves are recommended because it is irritating to the skin and the airways. Wet, it remains harmless.

Presentation: 4x4 cm diameter cubes, sold by 77 on a plastic tray (for germination and cuttings).