Blessed Thistle is traditionally used for protection, purification,  and reversals of negativity.  It can help banish unwanted spirits.  It can also help break jinxes and turn them back to the sender.  It can be used to ensure a restful sleep or when anxious or having nightmares.  
The planet that rules this herb is Mars and the Element for it is Fire.  The Zodiac signs associated with this herb are Aries and Scorpio.
This herb is not intended for internal use