Big sagebrush is an aromatic, woody shrub, freely branched above, from 4-30 dm tall. Young stems are silvery-gray, while the older stems become grayish brown. The oldest stems have bark which is noticeably shredded.The leaves are gray, crowded and narrowly cuneate with 3 rounded teeth or lobes on the blunt tip. They are silvery green above and below and strongly scented. The leaves alternate on the stems, and they may be both deciduous and winter persistent.The flower heads are loosely spread out along the tips of the branches. The flower heads are soley discoid with 3-8 flowers per head. Big sagebrush flowers from late summer into fall.