Ok, keep in mind this info is from " the Perlite People".
http://www.schundler.com/polystyrene.htm
Barbara M. Martin
Current Mid-Atlantic Garden Report: "Tree Trimming Time"
http://nationalgardening.com/regional/report13.html
Now at Cottage Garden: "Terrariums and Dish Gardens"
http://www.suite101.com/article.cfm/cottage_gardening/89852
Co-Owner, Gardens List http://www.scin.quik.com/dorsettm/notes.htm
and
