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I am trying to develop a system whereby I can get a 3 year life cycle out of the 'Tainer....
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Ah. The newspaper would likely only last one season, regardless
of whether it effectively resisted root penetration the first
season.
(I have used several layers of it to repress turf under a new
raised bed, which it did well. The only turf that grew back was
at the edges outside the walls of the raised bed. This is the
same turf that routinely penetrates landscape fabric that I
have used around shrubs. But when I put a shovel in the
raised bed that deep the next spring, all traces of the
newspaper layer were gone, broken down into unrecognizable
bits of organic matter by bacteria, fungi, and earthworms.)