I usually get about 3-4 years out of my mix before it just becomes hummuss for the worms in real dirt. On the 2nd and 3rd year, I add more bark and coarse vermic. Heh, if I snapped a pic of my mix, it would look like 50% white - somewhere as it dries out over the winter, the vermiculate tends to make it's way to the top.
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