It will be 3 years soon for growing in undisturbed soil in the current bed/pot. But most of the soil in my current setup comes from the recycle bins I had a no-till going on before that for 3 years. When I first started my current setup I emptied each of the 4 bins out in one piece into the empty bed so not to disturb the soil, still with full skeletons of my last grow in them, and then added enough new soil mix to fill in the gaps.
