Toxic weed found in Delta first class salad… what?!

Wild story from View from the Wing: a Delta F passenger says he found black nightshade in his salad on ORD–SEA, got sick, and then the FA took the plant “as Delta’s property.” Paramedics met the flight. Delta offered 3k miles while they “investigate.” I’m not usually dramatic about airplane food, but this one made my stomach flip.