How do I sterilize old potting soil?

Maybe you should rethink baking it. I googled your question and it said...

Why Sterilize Potting Soil?

Sterilizing potting soil is very important when sowing seeds, seedlings, and cuttings. Soil naturally contains pathogens, harmful bacteria, and fungi that can harm or kill susceptible plants. ... Sterilizing potting soil is easy and very beneficial to plant health.

Hi Ed! I have listed some great information sites for you to look at for sterilizing your old potting soil.

https://www.bing.com/videos/search?q=How+do+I+sterilize+old+potting+soil&qpvt=How+do+I+sterilize+old+potting+soil&FORM=VDRE

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm

https://homeguides.sfgate.com/sterilize-used-potting-soil-35823.html

https://homeguides.sfgate.com/microwave-potting-soil-48342.html

Hi Ed, Here are some tips for sterilizing potting soil . Steaming, baking and I hope you like the one about using your microwave. Good luck Tips To Sterilize Potting Soil, Garden Soil And Soil For Seeds

1. https://www.gardeningknowhow.com › Gardening How To › Soil, Fixes & Fertilizers
2. 
   

Dec 17, 2016 - Methods for Sterilizing Soil for Seeds and Plants. Sterilizing Soil with Steam. Steaming is considered one of the best ways to sterilize potting soil and should be done for at least 30 minutes or until the temperature reaches 180 F. (82 C.). Sterilizing Soil with an Oven. Sterilizing Soil with a Microwave.

Hi Ed. The soil should be fine to reuse as is unless your plants had any diseases. I would just add some compost to the soil to add the nutrients back in. You could also put it in a black plastic bag and let it bake in the sun. Good Luck!