vegetal taste in new cabernet?

[wdonovan]

What causes a vegetal taste in a young cab? I would describe the taste as green olives, very in-your-face, no getting around this one. Is this something that pops up one bottle at a time or does this attribute come from the entire vintage? In other words, should I try another bottle or two before passing on this vintage as a whole or is this because of weather or bad winemaking practices?