Also called coyote mint  this highly fragrant perennial herb grows in compact mounds about 1 to 2 feet tall by 2 feet wide.  The lush gray green leaves enjoy sun to light shade  and the plant produces 1 to2 inch round lavender blooms in summertime from June through August  a favorite of butterflies and other native pollinators.  Coyote mint needs well-draining soil  but can tolerate weekly watering if necessary  less in summer.  Great on rocky slopes or serpentine soil  it also does well in sand or clay.  After coyote mint is done flowering  cut back to encourage healthy new growth and an improved appearance.  An excellent choice for rock gardens  edging a walkway or using as a groundcover  coyote mint fills in nicely and keeps a neat  compact form.