Yarrow (aka Milfoil or Achillea) is a ferny looking flowering perennial that grows wild and in your garden. Its historic use has been for digestion, gas, gastroenteritis, and stomach cramps. It is also beneficial for the liver and gall bladder and stimulates the flow of bile. It is a traditional remedy (as a tea) to stop internal bleeding, including reducing heavy menstrual flow. It is highly antiseptic and is good as a wash for sores and wounds. The parts used for tea are the flowers, leaves and stems – basically the whole plant above ground. If you grow this plant in your garden, you may dry the leaves and flowers for later use as a tea. Also, beware that it can be invasive, easily crowding out other plants nearby, which is probably why it survives so well in the wild.