looks like a Texas Sage - aka (Texas Ranger (Walker), Texas rain sage, cenizo, Texas silverleaf, Texas barometerbush, ash-bush, wild lilac, purple sage, senisa, cenicilla, palo cenizo, or hierba del cenizo)
It is available in a variety of cultivars, including 'Green Cloud', 'White Cloud', 'Compacta', 'Convent', and 'Bert-Star'.