Rowan trees are said to protect against bad spirits. It was used in butter churns so that the butter would not be overlooked by Faeries. Bewitched horses may be controlled by a rowan whip. Druids used rowan wood for fires with which they called up spirits whom could be forced to answer questions when rowan berries were spread over the flayed hides of bulls.
Rowan, Ogham name Luis, rules 21st January to 17th February and its element is that of Fire. It is also known as "Quicken Tree" ~ the tree of life, in Norse it is called "Runa" meaning rune or charm for magic.