Blue Sage also known as "Grandmother Sage” is a purifying herb with broad medicinal and magical applications. Blue Sage is widely used for cleansing and purification purposes, it provides spiritual strength and sometimes it is also used during exorcism rituals as well to remove the malevolent spirits.White sage (Salvia apiana) is also antimicrobial. And both have been shown to repel insects. Beliefs that burning sage clears out spiritual impurities, pathogens, and even insects have been fundamental to the practice of smudging.