That really depends on the manufacturer of the soil. They both usually have an ingredients list on the package & are usually somewhat similar. They usually have sterilized soil, although potting mix may sometimes be soiless, peat, vermiculite & or perlite & sometimes other organic matter like powdered egg shells etc., some have a time released fertilizer too. Look for the ingredients label & it should tell you what is inside & the percentages of how much per bag/pound etc. I find it is lots cheaper & you have more control if you make your own mix up & store it in a large rubbermaid container.

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