yup... pond liner, layers of newspapers, weed barrier, concrete, etc.

you want a barrier that they won't grow through.

Things to consider:
Where is the runnoff going to go if you use a less permiable barrier?
What kind of monitary/time investment do you want to make?
With anything "permanent" think about local codes. (since this is a
property border)

good luck.

--
be safe.
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