Filderkraut Cabbage Wikinger im Rhodo Rausch 10 Actually Low Light Plants to Brighten Up Darker Rooms Garden Betty Mad Honey The Rarest Honey in the world The honey collected by the bees from the nectar of rhododendrons is known as Mad Honey. Rhododendron has a special ingredient called grayanotoxin, which File:Rhododendron argyrophyllum subsp. nankingense 'Chinese Silver' Hillier Gardens Romsey, Hampshire, England DSC04700.jpg Wikimedia Commons