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Thanks,
Hi
Try Myopex, a black woven sheet as used by local councils and
landscape contractors. It's quite expensive but it lasts for years and
will stop everything but the most pernicious of things coming through.
Steve
Not quite as good, but much cheaper (free, if you have a good source)
is shredded paper. If you don't mind looking at it, that is.
Maren Purves
(getting ours from the office)