Oh yeah quack grass would take extra effort to manage!! In past sheet mulching attempts with bermuda grass I found that it is important to make many layers of cardboard, interlacing overlaps at least 6-12". If you just make one layer and only overlap an inch or two or don't overlap the bermuda grass is bound to get through. I like at least 3 layers of cardboard or half inch thick layer of cardboard minimum at least in those situations and edges overlapping at least a foot apart to be extra sure.
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