(P/2-5')(F.S./P.S.) Z6-9 This herb also known as Deadly Nightshade with its purple flowers and shiny black berries may have a fairly sinister past with its powerful sedative and poisonous properties. A source of atropine, used in the treatment of eye disease and muscle spasms. Venetian ladies would use a distilled water of it to dilate the pupils. Poisonous - do not take internally.