Garlic
Vampires have a mystical aversion to garlic plants. The wearing of at least one clove around one’s neck was sufficient to ward off a vampire. Furthermore, a vampire could not use his or her shapechanging abilities while within about twenty feet of a garlic clove.
In some parts of old Romania, windows and thresholds were smeared with garlic juice or decked with garlic flowers to ward off witches, vampires (strigoi/moroi), and other supernatural beings on such nights as the Eve of St. George (April 22) and St. Andrew’s Eve (Nov. 29) when such creatures were believed to be especially active. Garlic was also used in other countries for the same purpose. These countries include Bulgaria and Bavaria.
Garlic could also be stuffed into the nostrils, eyes, and ears of a corpse to prevent vampirism. (Barber, 1988, 48). Although it does not cause them any actual harm, the wearing of at least one clove around one’s neck is sufficient to ward off a vampire. Additionally, the vampire cannot use its shape-changing abilities while within about 20 feet of a garlic clove.