Horseradish (Armoracia rusticana, syn. Cochlearia armoracia)'s a perennial plant of the Brassicaceae family, which also includes mustard, wasabi, broccoli, and cabbages. The plant's probably native to southeastern Europe and western Asia, but's popular around the world today. It grows up to 1.5 meters (five feet) tall and's mainly cultivated for its large white, tapered root. The intact horseradish root has hardly any aroma. When cut or grated, however, enzymes from the damaged plant cells brea… (More on Horseradish)