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Old June 10, 2017   #46
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,273

From what I read, you can use styrofoam, although perlite and vermiculite are superior at retaining air and water in the media. You might try looking for other alternatives, like a very coarse sand, or a small-sized, porous gravel.
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