Nettle leaves: Urtica dioica: A Eurasian and Mediterranean plant, this plant features some nasty stinging barbs. It has been used in cuisine as well as folk medicine in places like Austria and Anglo-Saxon England. Besides stingers, it also has vitamins A, B, C and K, calcium and iron. It can also help treat an enlarged prostate, lower blood pressure and help control blood sugar. Luckily the plant has a tender and mild taste similar to spinach.