Hi dice,
Geez - - I am freezing my "wicking basket" off tonight in Trendy,, Downtown,, Toronto. Cold and snow today - - but I am outta here tomorrow heading back to SFO.
My concern with the wet cardboard approach is that it would cover up all of the holes drilled in the aeration bench, and would prevent oxygen exchange in the root system which is an essential element of the design (Just ask Earl, as he gave me a good education on the purpose of aeration holes last year).
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.
Ray
|