A wonderful aster for dryish places!
Pacific Aster has late- blooming flowers that are light purple to violet, and draw a huge diversity of pollinators. It tends to spread slowly by rhizomes, and will twine its way through other plants. Intermix with Fleabanes and Oregon Shunshine for a pollinator garden you will rarely need to water!
"H20130729-9066—Symphyotrichum chilense—UCBG" by John Rusk