Asparagus Odor Detection Genetics and More Garden Asparagus might cause a unique smell within your pee. It is generally acknowledged that consuming this green vegetable can cause a powerful aroma during a trip to the bathroom. If you notice an unappealing aroma after enjoying a meal comprising asparagus, do not be alarmed. It is just a typical reaction that occurs within the body. Feel confident that the smell is harmless and will go away over time.