In the Celtic Ogham the Alder or Fearn is associated with the Welsh God Bran and his sister the Goddess Branwen. This Ogham is associated with courage and the Warrior. The Alder was often used to make shields. It represents the importance of leadership and making good judgment. Often it means you must do what is best for your people over what is best for yourself, Bran and Branwen's story in the Mabinogion is a great example of this. Alder also has associations with balance and prophecy.

The Willow Ogham is associated very strongly with the moon and with Feminine aspects. Its associated with the Welsh Goddess Cerridwen who is a goddess of inspiration and prophecy. It's also associated with Bards and shamanism. Willows were used to make talismans and wands that would provide protection in the Otherworld. Willow would also be used to make harps as well.
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The Ash in Celtic Ogham symbolizes wisdom, justice and the pursuit of knowledge, both practical and magical knowledge. Ash trees were used to make magical spears and staffs. The Ash is associated with the God Lugh, who is a God of a law and order and also the "God of many skills" it's also associated with the Goddess Andraste. The Ash is a solar stave and is connected to the sun. Ash is associated with seeking balance.