You will never *completely* get rid of the bermuda.

Hope this helps,
Bob

Hear hear. I lived in Las Vegas for 15 years, and never won the battle
against bermuda. If you live where bermuda grows well, you will probably
never be rid of it unless you take drastic measures. Even if you clear the
garden, it will be invaded from the sourrounding edges. You will have to
sterilize the soil and install barriers around the garden to prevent outside
plants from invading. And even then you will have seeds and stray rhizomes
that somehow end up in your garden. One little rhyzome can spread very deep
and very fast, and once it does it will be a constant battle against the
invasion. Once the roots get into the ground, you will have a difficult time
controlling it.

OTOH - anything that shades the ground is effective against bermuda, as it
does not tolerate shade. Mulching can be effective, but your mulch has to be
deep enough to keep the grass from coming through. Bermuda will easily grow
through a 12 inch layer of mulch.