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Rock wool

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As far as I know rock wool is rock wool and there's no special rock wool for plants. Someone, sometime, long, long ago apparently had some lying around and decided to use it for plants and it became the standard. As to where to find it, Home Depot and Lowes both list it on their sites in batts and blankets that you could cut apart to use in pots and it's widely used in hydroponics so look at anyone selling hydroponic supplies and you should be able to find it also. Hydroponics sites tend to sell it in small cubes or larger cubes for use as a rooting medium for the hydroponic plants. Even Wish has it if you don't mind waiting a decade or so for delivery. E-Bay also has sellers selling it for the home hydroponics folks. 

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