Quote:
Originally Posted by eager2learn
whats the inert material for?
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Roots in a pot will grow down into medium as well as laterally. Mostly, those roots are trying to hold onto something, and pull in water, with acquiring nutrients as a lesser task.
Roots that grow downward may go into medium that stays damp all the time. Organic material deep in the pot may rot, break down, and clog pore space in the medium, potentially encouraging root rot. The inert material provides something for roots to hold onto, but doesn't rot. There is a better chance that the pore space will stay open, and roots will stay healthy.
An added bonus is that most of us end up with scrap styrofoam from purchased electronics and other fragile items. If styrofoam recycling is not available, using the styrofoam as part of your medium re-purposes the styrofoam instead of sending it to a landfill. The free styrofoam you use also saves on bark that you have to pay for.