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Cardboard...?

 
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I'm looking for info & opinions concerning the use of cardboard as sheet mulch in permaculture. I read recently about concerns around fumigation and chemical residues as well as ingredients in the cardboard itself and the glue used to seal. I would really like to hear from people on this and any resources documenting this would be hugely helpful. I have read Paul's post on cardboard but I hadn't really thought too much about the whole fumigation of boxes with product in them prior to shipping.

Many thanks!
 
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Location: Southern New England, seaside, avg yearly rainfall 41.91 in, zone 6b
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I use a lot of cardboard. It helps slow down the infiltration of my needs and paths from the dreaded bindweed. (We have other weeds but that is the one that is hardest to manage)

I mostly only use cardboard from our food co-op which has nearly all organic food. I.wonder if there is less chance of fumigation?

I don't use the kind with shiny printing or much colored printing.

It seems like an abundant resource to catch and store and use. I wonder how toxic it is? I feel like being able to grow abundant food here using cardboard might negate any toxins that might make it into the food
 
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If you have active soil fungi, then these chemical contaminants are being broken down by the fungi. If you want to learn how to speed up that process, stop by the fungi forum and join our discussion on mycoremediation.
 
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I use cardboard on my garden....works great no weeds thus far and I installed it in early May......I placed it between the rows of tomatoes and then I put straw/grass clippings on top to hide the cardboard.
 
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