Zingiber officinale - Ginger is one of those wonderful plants that double as medicine and food. It is a tummy tonic par excellence. Good for nausea, diarrhoea, indigestion and cramping. If you are a cold fish, ginger is also a terrific circulation tonic. Recent studies have shown that in addition to its tummy powers, ginger helps lower cortisol in the body, which helps reduce stress and anxiety. Sipping on a ginger tea has never tasted better.