Hello All, I kinda do the same thing with potting soil and my home made compost. I went to the dollar store, picked up a few large aluminum roasting pans, covered and threw them in the oven until the temp reached 185 deg F. So far, so good. Fred in Cambridge MA...where someone forgot to tell April that it's April!!!! -----Original Message----- From: pbs-bounces@lists.ibiblio.org [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Dennis Kramb Sent: Wednesday, April 03, 2013 2:47 PM To: Pacific Bulb Society Subject: Re: [pbs] Was Cardamine hirsuta Sterilising potting mixture I bake commercial potting mix in an oven at 220 deg F (roughly 105 deg C) for 2~3 hours to kill fungus gnats & their eggs. Dennis in Cincinnati