The lifespan of potting soil Fortunately, most potting soil can last up to two years because that's the lifespan of the peat it probably contains. Potting soil can go bad, but it usually doesn't happen if it's not used and if you're willing to rejuvenate the potting soil a bit. Even after several years of sitting, old potting soil can be recovered and used. Soil used for pots has the greatest chance of spoiling, since old plant material in the soil encourages the appearance of mold, mildew and pests.
After one season, the land used has a minimum nutritional value left. It's generally OK to reuse potting soil if whatever you're growing in it was healthy. If you've noticed pests or diseases on your plants, it's best to sterilize the mixture to avoid infecting next year's plants. First, remove roots, larvae, leaves and other debris from old potting soil.
Then, decide on the best method for banishing microbes and insects.
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