So Kate used to have me sift micro green a lot. The way you do it you take the trimmed micro-green trays (harvested greens) and dump them in a square box that has wire in the bottom. The wire acts like a strainer and removes the dirt from the roots. You rub the micro-greens into the wire to get the dirt away from the small roots from the plant. Then we take any leftover greens and large root chunks and put them in the compost bin. The leftover dirt is put into a black garbage can to dry then we reuse it.