The burr-like seed heads of Agrimonia eupatoria (common agrimony) aid in propogation by clinging to passing wildlife.
Common agrimony is a dark green, perennial herbaceous plant with yellow, spike-like flowers and serrated-edged leaves. It sprouts from a rhizome root and can be found all over the planet. In the Northern hemisphere, it blooms between May and September. Each individual agrimony blossom has five petals and the stamens rise above the flower cup. A mature plant can reach heights up to 100 centimeters (just over three feet).
Agrimony was traditionally in sleep charms to relieve insomnia caused by stress or depression. It is also useful as a protection charm against dark magick. For best results, it should be harvested on the Summer Solstice.