Roger,
If you couldn't get enough large sheets of cardboard for the bottom layer, couldn't you also use a permeable landscape cloth material?
What do you think?
Thanks, Lee
Answer:
Lee,
Getting cardboard is not hard. The store where you would buy the landscape fabric, ask them for cardboard, instead.
Lasagna gardening is a sustainable long term plan. You only need the cardboard or newspaper layer the first year. Then your microbes, insects and plants are back to some access to the soil. The insects are constantly moving between the soil and mulch of a Lasagna Garden. All Earthworms migrate deep to survive winter freezing. I imaging insects cannot get through the holes in the landscape fabric.
Grocery stores, applaince stores, mattress stores and any store has cardboard boxes they send out for recycling. You can usually get them for the asking.
To install a non-biodegradable membrane below a Lasagna Garden, you are going against the philosophy, principles and long term plan of the system. I don't think in the long run you will have as good as success as with cardboard or newspaper.
Just my opinion. Good luck,
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