I believe there was a supreme court ruling on nuisance laws....can't put my fingers on it at the moment. However, my recollection is that, as applied to noise,

I believe there was a supreme court ruling on nuisance laws....can't put my fingers on it at the moment. However, my recollection is that, as applied to noise, expect decibels had to be defined in the law for it to be legal. I assume something similar would hold true for landscaping.