The European mistletoe, Viscum album, figured prominently in Greek mythology, and is believed to be The Golden Bough of Aeneas, ancestor of the Romans.
Mistletoe bears fruit at the time of the Winter Solstice, the birth of the new year, and may have been used in solstitial rites in Druidic Britain as a symbol of immortality.
In the early Christian era, folk legend stated that Common Vervain (V. officinalis) was used to staunch Jesus' wounds after his removal from the cross.
When the thirty-first day arrives, take out the root in the middle of the night and dry it in an oven heated with branches of verbena; then wrap it up in a piece of a dead man's winding-sheet and carry it with you everywhere.
In The Struggle, Volume II, the vampire Stefan instructs the human Elena that vervain can "protect you against bewitchment, and it can keep your mind clear if someone is using Powers against you.
And you can make the dried leaves into a sachet and carry it with you, or put it under your pillow at night", but gives her an unprepared sprig for protection in the meantime.