bonaventure@optonline.net bonaventure@optonline.net
Tue, 02 Jul 2013 05:56:28 PDT
  I can tell you for perlite with fine particles, it was bad news in the way I used it. The stuff coming from the big box stores here in New Jersey, USA, is loaded with dust and fines, the brand M******Gro has really gone to sh*t. 
I had used it primarily for Cypripediums, mixed with other inorganic material or cactus,palm,citrus potting mix. Even after being sprayed down and washed through a sieve outdoors, whereupon it loses half of its volume, I found that its addition turned the mix late in the season to a solid concrete like consistency, completely unfriable in one thick clump with no air spaces.
Bonaventure Magrys

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