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Ways to Reuse Potting Soil. The easiest way to reuse old potting mix? Simply remove old plants from their containers, fluff up the soil and replant. If you've reused the same soil for several years or it's developed a white surface crust, you may have to cut it with 50 percent new potting soil and/or apply fertilizer.
You'll probably get differing views in response to your question, but personally, I do re-use potting soil (unless the pot previously held a diseased plant of some kind, then I chuck it). I remove maybe the top inch or two of soil, and rake through the remaining, removing any big clumps of old roots, etc.