Yes, the density of your part relies greatly on the substrate and we encourage you to explore. We recommend keeping at least 30% of the GIY material in the mix to incorporate enough mycelium inoculum. The added substrate of your choosing must be pasteurized beforehand as to not add microorganisms which compete against the mycelium.
First Time User? We recommend first-time users work with the standard GIY material before trying to grow with additional substrates. This will allow you to master the process and you’ll be better equipped to troubleshoot growth issues when using additional substrates.