Vermiculite

Vermiculite is puffed rock (Mica), which is very light. The airy structure supplies room inside substrate mixtures for the mycelium to 'breathe'.

Reviews

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Jan 8, 2009 Richard said:
     
“Its better to have big chunks of vermiculite, the substrate needs to be airy. Also the brf will coat the vermiculite alot easier.”

Oct 9, 2008 BigBeatBoy said:
    
“Good, but could could be grinded to be a bit smaller. The smaller the chunks, the better.”