"This woody shrub, Blue Witch, is also known as Blue Nightshade or Solanum umbelliferum. It blooms all spring and summer. It has greyish-green leaves and makes green berries about the size of a hazelnut. The berries develop in May and June. Yes, this shrub is related to Deadly Nighshade. All parts of the plant contain the deadly alkaloid Solanine. Surprisingly, it is also a close relative of the tomato and potato. The cultivated "potato bush" looks a lot like it, but the petals of the potato bush are darker and don't have the little yellow or white spots on each petal. The wild tomatillo is also in the Nightshade family. Apparently, it took two hundred years for Europeans to get up the courage to eat tomatoes. Can you blame them when a few berries of the Deadly Nightshade can kill?" - Reference.