Yarrow (Achillea millefolium) was collected by children during the First World War and sent to the front line to be used as a herb to stop bleeding and heal wounds. It has long been used as an antiseptic, even before people understood what that was. It is also a beautiful flower, loved by bees, butterflies and other pollinators.
As ever with native plants, it has wonderful common names, including Soldiers Woundwort, Melancholy, Knight's Milfoil, Angel Flower and definitely my favourite, Bad Man's Plaything (the mind boggles!).