Quote:
If Landscape Fabric is not readily available, consider
instead to use some old window screen with a fine mesh. This
should inhibit root growth into the water reservoir while
permitting air to permeate the root system.
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Some kinds of synthetic fabric may work, too (rayon, nylon,
polyester, etc; great use for those old, shiny disco shirts
with the big collars.) With something like that, capillary
action would be drawing water and air through it, just like
it would for landscape fabric.