1,008 pages on this wiki. The mandrake is a magical plant used frequently in spells and rituals. The root was also thought to scream when it was dug up from the ground, killing everyone who heard its cries. In the show, the mandrake is a big and grey root, similar to a straw voodoo doll.Morgause, with the help of her half-sister Morgana, used it to enchant Uther Pendragon and make him lose his mind.organa also worsened Uther's sickness by wrapping the mandrake up with a string and pulling it twice: this caused the root to scream, like if it was in pain, and so Uther had another vision of Ygraine with many drowned boys, begging the King not to harm them.