Hubricht’s bluestar (Amsonia hubrichtii, USDA zones 4 to 9), which when massed produces a cloud of bright yellow, then orange, then finally a rusty brown before defoliating. It is about 3 feet tall and wide, prefers full sun and medium to dry soil, and has bright blue flowers in late spring.
Sedum is a great fall color perennial, and the cultivar ‘Autumn Joy’ has reliable golden hues. There are ground cover sedums that get orange and bright red, and since they are a succulent, they’re easy to reproduce. Most sedums like dry to medium soil in full to partial sun, and they are a great nectar source for pollinating insects.
Asclepias incarnata, swamp milkweed, and it likes full sun in damp to medium soil, growing to 3 feet tall and 1 foot to 2 feet wide. Last year it was red, orange, yellow and green all at once. Monarch butterflies lay their eggs only on milkweed.
Liatris ligulistylis a favorite nectar plant for butterflies, puts on one of the most impressive displays for perennials. It likes full sun in medium to moist soils, reaching 3 to 4 feet tall and 1 foot to 2 feet wide, blooming in mid to late summer. Other Liatris species also do well with fall color, ranging from ambers and rusts to pure yellows.
Senna hebecarpa has a long bloom time in summer, well over a month, attracting many bees and pollinating flies with its yellow flowers. As the seed heads develop, they elongate and become super fuzzy, and in winter rattle in their black slips. Great fall color with yellows and oranges glowing in the late afternoon sun. American senna gets about 4 to 5 feet tall and wide and likes medium to moist soil in full sun.