I love most everything from the garden. So, this Fall I gathered a bit of yarrow, pressed it, let it dry, and adhered it to handmade paper before placing it behind the glass.

Then  I googled yarrow lore.  Apparently yarrow was sometimes consulted where love matters were concerned. One famous love charm required that a handful of Yarrow be sewn into a flannel square and put under your pillow. Then you should recite a poem and wait for your future husband or wife to appear in a dream.
In addition, yarrow , possibly because of it's strong odor, was sometimes called the Devil's Plaything and associated with witchcraft and evil.
Another perspective asserts that yarrow could protect one against that very witchcraft. It  was strewn across the threshold of a house to keep out evil influences and was worn to guard against evil spells. Some people tied sprigs of it to a baby's cradle to protect the infant from witches who might try to steal away its soul.  Essentially it's a pretty little trinket whatever the lore is.