Smudging is a exercise common to many native American traditions, and alternative healing practices. It involves burning selected herbs or other materials in a manner that fills the home or space with the fragrance of the smoke and is thought to clear negative energy.
Homes/Offices accumulate negative vibrations over time, so feng shui practitioners find it helpful to smudge the home at least several times a year. Some people smudge as much as once a week, and you can also use smudging to clear your own bodily energy or the energy of other people.
How do you smudge a house?
Moving Around the House. Move in a clockwise direction around your house (usually starting at the front door), and gently wave the smoke into the air. Spend a bit more time smudging the room corners, as they tend to accumulate stagnant energy. Be sure to also open the closet doors and carefully smudge inside.

My own smudge stick above from opal moon http://www.opal-moon.com/page45.htm
Many other smudging kits are available online if you are interested in doing this. Im hoping to make smudging a monthly thing as I really believe in the power of plants and herbs. Here are a few kits available online :