To add to my post yesterday, I have learned more about rowan trees. The information following is from Brewer's Dictionary of Phrase and Fable.
They were called "Wiggentree" in Westmoreland. It was greatly venerated by the DRUIDS and was formerly known as the "Witchen" because it was supposed to ward off WITCHES. "Rowan tree or reed, Put the witches to speed."
Many mountain-ash tree berries are said to demote a deficient harvest. In Aberdeenshire it was cutomary to make crosses of roan twigs on the eve of the INVENTION OF THE CROSS and to put them over doors and windows tow ard aoff witches and evil spirits."