Spilanthes is a low growing frost-sensitive annual that with red and yellow button flowers that, given even the slightest nibble, will produce a tingling, numbing, saliva producing reaction in your mouth. It’s quite an experience, but fret not! It’s not poison, it’s medicine. That is the action of the alchylamides, the medicinal constituent of the plant that is also anti-microbial, and immune stimulant . This is why this herb makes a most wonderful throat spray.