Celtic Traditions: Celtic tree worship - Almost all kinds of tree found in the Celtic countries have been thought to have special powers or to serve as the abode of the fairies, especially the magical trio of oak, ash, and thorn.
Dara Celtic Knot - The meaning of the word, 'Dara' can be traced to an Irish word, doire which means 'oak tree'. The Dara Celtic knot is associated with the root system of oak trees. The Celtics and especially, Druids considered the oak tree as sacred.
A List of Truly Enchanting Irish Celtic Symbols and Their Meanings
Tree of Life history and research. Celtic Tree of life and how it relates to Tree of Life Tattoos.A research, design and history page about the Tree of life thru the ages to its now modern use as a Tattoo design.