> From: "Roger S. Miller" <rgrmill at rt66_com> > (big snip) > > 3) inserting some crumbs of white blackboard > chalk (CaCO3) into the substrate around the plant 3) adding some boron > (from borax?). Backboard chalk isn't CaCO3, it's gypsum, CaSO4.2(H2O). It will still do as a calcium source. -- Paul Sears Ottawa, Canada