Yavanna knew that Saeril would ask that question sooner or later. "A special flower. It has healing properties...that work miracles against poison." Yavanna said softly. "It's for Kili...just in case..." she said softly. She didn't know, how much the poison had spread in his system, by the time she helped him out earlier in Bard's home...but this might be needed. If something were to happen.