On Wed, Oct 24, 2012 at 6:47 PM, Eugene Zielinski <eez55@earthlink.net>wrote: > Diana brings up a good point. I've found that the horticultural grade > perlite avaliable in small packages in "big box" stores, etc. contains a > large amount of fine material. I buy six cu ft bags of what is listed as #2 perlite from a horticultural supplier, but it contains a large quantity of fines. It is useful as is for plants that like a high moisture content, but needs to be screened for bulbs for which I want a more open medium. Randy - Monterey Bay Region, California