Celtic Reiki is a variation of Usui Reiki, using vibrations of specific trees and shrubs along with other Earth energies to assist in healing and manifestation. The frequency of the plants and trees work to channel energy up through the Base Chakra, rather than down through the Crown Chakra as in the traditional form of Reiki. I was fortunate to attend a 2 day workshop with Martyn Pentecost, the originator of Celtic Reiki.