Some things you must guard with care:

There are rowans in the dooryard;
Rowans in the yard are sacred,
Rowan branches too are holy
And the leaves upon the branches -
And the berries even holier.


Kalevala: Rune 23 - The teaching of the bride. 

 How fair wert thou in simmer time,
Wi' all thy clusters white.
How rich and gay thy autumn dress,
Wi' berries red and bright.
Oh thy fair stem were mony names
Which now nae mair I see,
But there engraven on my heart,
Forgot they ne'er can be.
Oh rowan tree.

Caroline Oliphant, Lady Nairn (1766-1845) "Oh Rowan tree"