The protective circle appears in cinematographic adaptation of Spiderwick Chronicles, it protects the Spiderwick Mansion against the goblins and is formed by a circle of murshrooms that neither goblins nor Mulgarath can penetrate. Arthur describes the circle's mushrooms ranging from Bright yellow to dark red, and sometimes green. The Recipe For the Protective Circle Consists of Ground Salt, Honey Locust, and St. John's Wort.