With courtesy of De Cort et al. (1998): "Atlas of Caesium Deposition on Europe after the Chernobyl Accident", EUR report nr. 16733, EC, Office for Official Publications of the European Communities, Luxembourg
Let the grass grow higher and thus encourage root growth. It will also allow the grass to self-seed. If you mow a path in the middle, it will show that it is indeed meant to be that way as opposed to being neglected.
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