Full Sun/Part Sun
Many are attractive even in winter when their foliage dies and is left standing.
They're also drought-tolerant and need very little if any care. They're favorites of butterflies and useful bees.
There are many different types of this plant, from tall types that will top 2 feet to low-growing groundcovers that form mats. All thrive in full sun with good drainage.
Ground cover types do a good job of suppressing weeds, but seldom tolerate foot traffic.