And yes, it was the tree that sold this one to me!
...and should you want the standard English translation (not nearly so prettily written!) it's
One night as I did wander,
When corn begins to shoot,
I sat me down to ponder
Upon an old tree-root:
Old (river) Ayr ran by before me,
And hastened to the seas;
A wild pigeon cooed over me,
That echoed through the trees.
According to this website.