Ash Tree - Druids wands were made of ash twigs. It also has healing properties. Weak-limbed children were passed through split ash trees which were then bound up. If the tree grew straight, the child would as well.
Illustration for the Ash Tree Fairy from Flower Fairies of the Trees. A girl fairy dances from left to right along the branch of an ash tree. The tree is covered with seeds. Author / Illustrator Cicely Mary Barker More