linton Posted April 29, 2009 Report Share Posted April 29, 2009 Does anyone know where I might be able to buy horticultural Pumice in Australia? Or is there an alternative product I can use?? I want to make a compost for Drosophyllum which requires 25% each of pumice, perlite, sand and peat. Thanks for any replies. Quote Link to comment Share on other sites More sharing options...
chloroplast Posted April 29, 2009 Report Share Posted April 29, 2009 (edited) The purpose of the pumice is to make a "looser" mix that is free draining yet holds moisture. Thus, any inorganic aggregate will do: Pumice, diatomite, silica sand, granite, perlite. You can substitute one of the above for pumice if you can't find it; eg, 1:1:2 perlite:peat:sand. The only caveat is that whatever you use should be coarse and free of salts/minerals. When it comes to aggregates, it's always wise to wash them a few times prior to use. Hope this helps. Ken Edited April 29, 2009 by chloroplast Quote Link to comment Share on other sites More sharing options...
linton Posted May 9, 2009 Author Report Share Posted May 9, 2009 Thanks for your advice Ken. Quote Link to comment Share on other sites More sharing options...
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