Can potting soil be reused after plants are finished?
Reusing Used Potting Soil
Yes it can. I dump all the old potting soils into my wheel barrow and mash it up so it is loose again. I remove the old roots as much as possible then mix in with it about 30% new potting soils. Now I have a nice batch of ready to use potting soil at less than half the cost of the same amount bought new.