How to Burn Herbs to Clear or Enhance the Energy in Your Space…
A smudge stick is a bundle of dried herbs, usually bound with string into a small bundle. The herbs are later burned as part of a ritual or ceremony. Plants that are often used include sage and cedar. – Via Wikipedia
Herbs for Clearing Negative Energy:
Positive Energy Herbal Library
Order: The Smudging and Blessings Book: Inspirational Rituals to Cleanse and Heal by Jane Alexander
Order: Energy Clearing by Cindi Dale.
Order: Sacred Space: Clearing and Enhancing the Energy of Your Home by Denis Linn.