PS: I did think of one other possible ad hoc alternative to the
landscape fabric: wet cardboard. (That might be especially
useful in places where landscape fabric is kind of difficult
to find or not affordable, but cardboard boxes are common.)
Getting it completely saturated first would allow shaping a
piece of it inside the wicking basket and a larger piece across
the support platform for the container mix and up the sides.
It still may only last one summer and be easily penetrated by
roots the following year, but it would be easier to find a single
piece of it big enough to line the whole container than a piece
of newsprint that size for big Earthtainers. It would probably
resist root penetration better than newspaper.
It should conduct water between the wicking basket and
container mix above it well enough, since it readily absorbs
water. (That would be something to test, though, to be
sure.)
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