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Old 07-14-2014, 11:03 AM   #12
Arey
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Join Date: Oct 2013
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I know they say to dump grass clippings on top of the cardboard, but my grass is so weed infested that I just leave the cardboard there. I removed the cardboard on only one area this Spring after putting it down late last fall, and weeds and grass did come up there and I've been weeding it. the other cardboard I put down last Fall I'm leaving there until nest spring when I'll remove it and spread white clover seed. I don't know that "clean fill" on top of cardboard would work since the fill could be infested with weed seeds. Whats under the cardboard might die in time, but at the same time what's in the fill could be thriving. Even tupsoil offered for sale can be filled with weed seeds. I once bought a load that produced a bumper crop of pigweed.
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