The European rowan has a long tradition in European mythology and folklore. It was thought to be a magical tree and protection against malevolent beings.
The density of the rowan wood makes it very usable for walking sticks and magician's staves. This is why druid staffs, for example, have traditionally been made out of rowan wood, and its branches were often used in dowsing rods and magic wands.
Rowan was carried on vessels to avoid storms, kept in houses to guard against lightning, and even planted on graves to keep the deceased from haunting. It was also used to protect one from witches.
I saw many rowan trees while hiking in the White Mountains. They are also known as mountain ash because of the ashy green of the leaves. They are no relation to the ash tree. The clusters of red berries are distinctive.
My mother planted a mountain ash in front of our hilltop house in Canada. Since ancient times, she told me, these trees were planted in front of houses as a house blessing. Rowans have many protective and magical powers. My mother was very proud of her little tree which thrived despite long cold winters and relentless wind on the hilltop.
Maybe she was also cultivating it for magic wands and walking sticks. I wouldn't put it past her.