palo santo and sweet grass have been known to be used by indigenous peoples of the americas for generations in rituals, ceremonies and daily practices. 
these sacred plants can be used for cleansing and purifying (smudging) spaces, persons and crystals. the smoke is believed to dispel negative energies and restore balance and harmony. 
how to use,
1) light the end of the dried plant bundle. do not blow out the flame, allow it smolder on its own.
2) walk around or place it in a heat-resistant bowl or plate in the space you want to purify. for persons or crystals, allow the smoke to filter around the body or crystal.
3) set your intention/prayer for purification and positivity. example intention/prayer: please clear this space of negative and unwanted energy. bring love, light and protection to this home and myself.
use with caution and intention.