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quackgrass supression

Title: quackgrass supression

In Seattle, our P-Patch community gardens have been using cardboard or newspaper and layers of woodchips for paths for years.  Unless your garden is certified organic, I would still consider your garden organic if they use cardboard for weed supression.  I would be interested to know of any research done on leaching of chemicals from cardboard into soil and which ones are taken up, if any.  Quackgrass seems to grow very well in the best and the worst of soils.

Sally Anne Sadler
WSU Urban Food Gardeners

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