- Mon Sep 16, 2019 11:32 pm
As water flows through the media it awakens microbes that lay in suspended animation while the media was dry. These microbes then absorb oxygen in the media. As time goes on, these microbes multiply and their numbers grow exponentially. This renders the media anaerobic in a matter of several months. As the microbes multiply and absorb the oxygen, they will break down the media through decomposition, which releases a multitude of nutrients being released.
Thus, it's advisable to repot or change out the media annually or or every other year. I prefer annually and do so in early spring when the plants are just emerging from dormancy.
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