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Potting mix is sterile and therefore does not contain any fungi or weed seeds to hinder your plants from growing. Find out why you should use sterile potting mix in your EarthBox in this free video on gardening with an EarthBox. Expert: Stan DeFreitas Bio: Stan DeFreitas, also known as Mr. Green Thumb, has experience as an urban horticulturist working for the Pinellas County Extension Service and has taught horticulture at the St. Petersburg College. Filmmaker: Christopher Rokosz