On 7 Oct 2012, at 9:18, Michelle Domocol wrote: > I have alot of excess soil/media from past propagation projects. Does anybody > know about cost-effective methods to sterilize and recycle excess soil? The late Ernie Lythgoe, a former doyen of our local rock garden club, used to mix up his potting soils from the reddish mineral layer of soil under the usual organic forest duff. He "sterilized" it by putting it in black plastic bags and leaving these out in the sun. How long? I honestly don't remember, but at a guess, a week or two in mid-summer. What I do: I dump it on various beds. The various ingredients can only improve the native soil, which is rather heavy and poorly drained. -- Rodger Whitlock Victoria, British Columbia, Canada Z. 7-8, cool Mediterranean climate