American White Sage
The White Sage available through this site is grown traditionally by the Sioux Indians in North America and is I believe the best you can get. White Sage has been used for centuries by native cultures in particular the native Americans to cleanse and purify people, animals, items and places. White sage when burnt generates specific vibrations and frequencies that can help negate negative energy and produce a calmer and more relaxed environment.
Spiritually speaking burning sage can alter the frequency of a room or area and help to maintain an even stable vibration making it very difficult for negative or undesirable energy from manifesting or inhabiting an area.