Perlite/ vermiculite. It's cheap and easy to use. Here's some more info.
https://www.gardenbetty.com/perlite/Open linkView original on beehaw.orgSyndicated from the fediverse. Read and engage on the original instance.
View original on beehaw.orghttps://www.gardenbetty.com/perlite/Open linkView original on beehaw.org
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