Everyone should go back and read Paul Cumbleton's excellent discussion of potting mixes from 2007: Potting Mixes & Drainage Paul Cumbleton (Thu, 22 Feb 2007 10:23:30 PST) <http://pacificbulbsociety.org/pbslist/…> This goes a long way towards answering a lot of the questions in this thread. If it's good enough for Wisley... --Roy A rainy day in Boston