Of or pertaining to birch; consisting or made of birch: as, “birchen brooms,”

adjective. Of or relating to birch.

adjective. Made from birch wood.

adjective. consisting of or made of wood of the birch tree

"Down nearly to the ground the pole was dressed with birchen boughs, and others of the liveliest green, and some with silvery leaves, fastened by ribbons that fluttered in fantastic knots of twenty different colors, but no sad ones."

woody