Yeah, it's poison for plants. The Romans famously sowed salt into the fields around Carthage when the destroyed the city so that nothing could ever grow there again.
Salt water takes fresh water away from living cells through osmosis. It's like drinking sea water, it will only make you die faster, because it dehydrates you and takes fresh water away from your cells and vital organs.
RE: Is SALT healthy? Episode #2 [DTube]