I realize that this is not a CP question, but I cannot think of a
better group to whom to forward this question.  CPs are notoriously
picky about their soil, and we have quite a few people here who
understand soil issues really well.  You can send responses to me
privately if you feel strongly that this doesn't belong on the list.
Thanks.
-- 
Will Estes                                      U.S. Computer
Internet: westes@usc.com                        POB 3150
                                                Saratoga, CA  95070
                                                FAX: 408-446-1013