One of the Demonstration Garden's  showiest plants is Datura, whose trumpet-like pristine-white flowers can grow up to 8 inches wide. This shrubby perennial grows to 4 feet tall and. This plant is likely Datura stramonium, known commonly as jimson weed, a name it acquired after soldiers in Jamestown in 1676 ate a soup made from the leaves and were poisoned. Like all members of the nightshade family, Datura is poisonous, although it's reported that the plant is dangerous only if eaten in large quantities. Other common names are Sacred Datura and Sacred Thorn-Apple.