On Sat, 21 May 2011 08:17:42 -0700 (PDT), Ted Shoemaker
wrote:

Which mulch best inhibits lawn grass?

Ted Shoemaker

The answer may be in choosing the best mulch or there could be another
way of doing what you want. If you told us the situation it would be
easier to say. In general the best mulch is the one you can source
locally and cheaply.

David