Do Just One Thing
It's fine to reuse potting soil if the plants that were growing in it were healthy and had no signs of disease or pests. But if you're unsure, you can sterilize it yourself to get it ready for reuse. Start by removing all the roots, debris and any rotting material in the soil. Then fill a black plastic garbage bag with the soil and tie it shut. Leave it outside in the sun for four to six weeks. During this time, the heat will kill all pathogens and bugs.
ANDREWS MCMEEL SYNDICATION
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