Answers

 1.Nettles.  2.Cabbage.  3.Peppermint.
 4.Elderberry.  5.Lemon balm.  6.Pink yarrow.
 7.Nettles.   8.Burdock.  9.Ginger.
 10.The Leech Book of Bald [Leech is an old word for doctor].
 11.Sumerian.  12.Juniper.  13.Pestle and mortar.
 14.Hippocrates.