Samhain is a hinge that marks the end of autumn and the beginning of winter. This is a time when the veil between the worlds is most thin, and one can make contact with the spirits of their loved one and their ancestors. The Celts believed that communication with their relatives and friends and animals that had crossed over provided needed love, guidance, and encouragement. For them, this was also a time to give gratitude and count one’s blessings. Sharlyn Hidalgo, author of The Healing Power of Trees, discusses the healing power of the Celtic Tree Calendar, especially at this time when the veil between the worlds is at its thinnest.