Used container soil
Every year in the fall I have 18 containers with moisture holding soil in them. Do you recommend I start with fresh soil every spring? If yes, what should I do with all this used soil? dump it in my garden? spread it on the lawn? other ideas?
I almost always re-use my container garden soil from year to year. Unless it has a diseased plant or something like that in it, I can't see any problems that I've ever had.
What I do, is add slow release fertilizer to the mix before re-planting in the Spring.
If I were you and decided not to use it again, I would always add it to, or start a compost bin.