THESE ARE MATURE FLOWER BUDS THAT CAN BE USED FOR SEED OR OTHERWISE Spilanthes Acmella is synonomous with spilanthes oleracea. Commonly, it is known as Toothache Plant or Eyeball Plant. The name Eyeball Plant should be obvious to anyone who is familiar with the plantâ€™s flowers, which are yellow and gradually turn to dark red in the center. It is more frequently referred to as Toothache Plant, though, because the plant contains an oral anesthetic called spilanthol. All parts of the plant contain this compound with the greatest concentration being found in the flower heads. Fresh or dried, the plant can be chewed to bring on an intense tingling sensation accompanied by a sort of metallic taste and increased salivation. Along with this tingling sensation is a numbness that is somewhat akin to that brought on by benzocaine. Aside from its pain relieving properties, toothache plant is said to benefit the immune system and have antibiotic properties. Spilanthes acmella is native to Brazil and Africa. In Brazil, the leaves have been used for culinary purposes, particularly as an additive to salads. According to one source, they are even combined with chilies to offset the burn. It is a perennial in warmer climates but is typically treated as an annual. It is considered frost tender, but it will maintain its greenness after most of your other plants have died from the cold.