On 1 Feb 2012, at 17:25, Leo A. Martin wrote: > It can be a pH issue as well. I seem to recall many mosses prefer slightly > acid environments. Perhaps you could raise the pH of your water a bit. > Winter-growing bulb seedlings grow fine with Phoenix tap water, whose pH > in the mid 8 range. An agrologist I worked with once told me that moss in a lawn is a sign of poor drainage, acid soil, shade, and low nutrient levels. (The last in reference to the grass growing poorly as a result.) The moral would seem to be not to water as much, to make sure that your seed mixes are near neutral, and to give plenty of light. Over the years, liverwort has been a much worse problem for me than moss. -- Rodger Whitlock Victoria, British Columbia, Canada Z. 7-8, cool Mediterranean climate