Matt wrote about pumice: >I order it from Charlies Greenhouse Supply. It's a little costly, about >$30.00 a bag, but I only really have to buy about two bags a season. What horror! The same bags, if they're the ones that weigh about 50 pounds (20+ kilos), cost $7 around here. The extra cost is all shipping, apparently. If I had a dump truck, I could buy it by the cubic yard/metre. I buy about 15 bags a year of this ground pumice to use in repotting my frame-grown bulbs, in seedling mix, and in general potting mix. Jane McGary Northwestern Oregon, USA