Grodan produces rock wool substrate from natural volcanic rock by liquefying it through high heat and pressing it through fine nozzles. Rock wool offers an excellent balance between nutrients and oxygen and is also very easy to transport.

Thanks to these properties, rock wool substrate in its various forms is the most widely used medium in professional plant breeding. Grodan Big Block 150x150x140mm cubes with 28mm and 38mm holes are usually used in combination with the cubes of the 150 trays, 77 trays or the 40mm cubes.

Details
15x15x14cm / rock wool
Cultivation block
Box of 48 pieces