蘆木 is read as ろぼく (roboku) and means calamite.
ろぼく
roboku
あし
common reed (Phragmites australis)
くさき
plants
かれき
dead tree
かみき
sacred tree
じゅもく
tree
あおき
live tree
なみき
roadside trees
き
wooden clappers (signalling the beginning or end of a performance)
ぞうき
various kinds of small trees
うえき
garden shrubs
ざいもく
wood (for building)
まさき
Japanese spindletree (Euonymus japonicus)