Popcorn Perlite Anyone?

You know that white substance in your potting soil? Here's a hint: It's not expanded polystyrene (styrofoam).  It's expanded perlite.  So, what's perlite? Perlite is an amorphous volcanic glass (SiO2) that has relatively high water content, typically…

by Kris Denz on January 19, 2017

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