Pour water into the bread machine pan and add honey. Sprinkle flour, oat bran, and lavender over liquid. Add butter and salt in separate corners of the bread pan. Make a shallow indentation in the center and add yeast. Snap bread pan into machine and set it to basic setting. Press start.

Add walnuts when bread machine beeps, 5 minutes before end of kneading cycle. Remove kneading paddle after final kneading.

When bread is ready, remove from the pan and cool on a wire rack.