Fennel

Knowledge (nature) dc 10: Green herb, with a big white root. This herb is a stimulant and very effective against poisons. The person drinking the brew made from this herb is allowed another saving throw against any poisons that have entered his/her body within the last 30 min.

Knowledge (nature) dc 18: The tea is brewed by putting the leaves into a filled clay water container and letting it sit in the sun for 10 days.