Asparagus pee What causes the smell Medical News TodayGarden Asparagus might cause a unique odor in your urine. It is widely known that consuming this green vegetable can result in a pungent fragrance when you visit the lavatory. If you notice an offensive aroma after enjoying a meal comprising asparagus, don't panic. It is just a typical result that occurs physiologically. Rest assured that the scent is harmless and will diminish gradually.