Purple Sage (Salvia leucophylla)

Purple sage (Salvia leucophylla) is a fast-growing evergreen shrub that can become a mounding form up to five feet tall, or a spreading form up to 10 feet wide and only 2  feet tall, which makes a great ground cover.  The leaves are gray green and in spring and summer large spikes bear whorls of purple flowers with a strong scent.

Purple sage grows in full sun and is amazingly drought-tolerant but can take light water up to twice per month in the summer, which will keep it looking a little greener.  Though it prefers well-draining soil, it is tough and easy to grow.  

The highly aromatic flowers attract a variety of birds and insects, with several butterflies and moths hosted.

Description from Calscape