Artemisia arborescens (tree wormwood) is a species of flowering plant in the family Asteraceae, native to the Mediterranean region. It is an erect evergreen perennial, with masses of finely-divided aromatic silvery-white leaves and single-sided sprays of yellow daisy-like flowers. This plant is cultivated for its foliage effects, but in colder temperate regions it requires the protection of a wall. The specific epithet arborescens means "woody" or "tree-like". This plant and the cultivar 'Powis Castle' have gained the Royal Horticultural Society's Award of Garden Merit.