Bermuda Grass question

[GDannucci at aol.com]

Hi,

I'm hoping that you can direct me to someone who might be able to help me 
with a Bermuda Grass problem.  We fairly successfully layered our front yard 
with newspaper and mulch to control the Bermuda Grass there several years 
ago.  Now the front yard sports dwarf fruit trees and is covered with native 
wildflowers.  However,   my problem is that Bermuda Grass keeps invading from 
the adjoining property.  We tried a border of bricks and boards without 
success.  So my question is this:  Has anyone come up with a successful 
barrier to the nasty stuff?  (I am, of course, excluding the use of 
pesticides or concrete!)

Thank you for any help you might be able to give me, 

Debbie Dannucci
GDannucci at aol.com