As the warm days of summer give way to the crisp air of autumn, you may find your garden lacking vibrant blooms, and with them, the butterflies that bring so much life and beauty to the landscape. My garden, on the other hand, is filled with late-blooming perennial flowers that offer a vital lifeline for butterflies, providing nectar at a time when resources are growing scarce. By planting these autumn beauties, you too can support butterfly populations and enjoy a burst of color long after most other flowers have faded. In this article, I’ll introduce you to 10 great late bloomers adored by butterflies in my garden.

Why Late-Blooming Perennial Flowers are Important for Butterflies

Late-season nectar plants are especially important for migrating butterfly species such as Monarchs, Painted Ladies, American Ladies, and Red Admirals. These remarkable travelers require abundant energy sources to fuel their long journeys southward to warmer climates. But it’s not just the migrants who benefit: species like Mourning Cloaks, Question Marks, and Commas (yes, those are their actual names) spend the winter in their adult forms, tucked away in tree bark or leaf litter, and need fall nectar to build reserves before hibernation. By cultivating a garden that blooms into fall, you’re supporting both the migrators and the winter residents.

My Favorite Late Flowering Perennial Plants for Butterflies

I’d like to introduce ten of my favorite outstanding late-blooming perennial flowers that will transform your autumn garden into a butterfly haven like mine. (All of the images in this article were taken in my own Pennsylvania garden.)

Licorice Mint (Agastache rupestris)

Licorice mint is one of my favorite perennials for growing in containers, usually reaching two to three feet tall and up to 18 inches wide. Its spires of soft orange to salmon-pink to bright pink flowers appear from late summer into fall. Hardy in zones 5 to 9, Agastache rupestris prefers full sun and well-drained, even rocky soil. The flowers’ bright hues are irresistible to butterflies, and the licorice-scented leaves are cool, too. This species is drought-tolerant, making it an excellent choice for drought-prone areas. There are many wonderful species of Agastache to include in your garden.

Chrysanthemum ‘Venus’ and ‘Sheffield Pink’

Chrysanthemum ‘Venus’ and ‘Sheffield Pink’ are two of my fall favorites, and they are often in bloom all the way until Thanksgiving! Unlike the mums often found for sale at nurseries in the autumn, this is a truly hardy perennial mum that returns reliably every year. With tidy growth, it typically reaches 18 to 24 inches tall and wide. Its soft pink, daisy-like blooms make a cheerful addition from early to late autumn. Hardy in zones 5 to 9, this mum thrives in full sun and well-drained soil. ‘Venus’ and ‘Sheffield Pink’ are notable for their extended bloom time when other mums have faded, giving butterflies one last stop on their search for nectar.

Purple coneflowers (Echinacea purpurea)

Commonly known as purple coneflower, Echinacea grows two to five feet tall and about 18 to 24 inches wide. Its distinctive daisy-like flowers, with rosy-purple petals surrounding a spiny orange cone, bloom from midsummer well into fall. Echinacea is hardy in zones 3 to 9 and thrives in sunny spots with well-drained soil. Besides supporting butterflies, its seed heads provide food for goldfinches as the season winds down. Its long bloom time and resilience make it a must-have in my pollinator garden.

Tall verbena (Verbena bonariensis)

With tall, airy stems reaching three to six feet high and a spread of up to two feet, Verbena bonariensis adds architectural interest to the late-season garden. Its clusters of tiny, lavender-purple flowers bloom from mid-summer until the first hard frost. Hardy in zones 6 to 10 (but often grown as an annual or short-lived perennial in colder areas), this verbena self-seeds prolifically, ensuring you’ll have volunteers each year. Its nectar-rich flowers are magnets for butterflies, especially in the fall.

Anise Hyssop (Agastache foeniculum)

Agastache foeniculum, or anise hyssop, stands three to four feet tall and spreads about 18 to 24 inches wide. Its upright spikes of violet-blue flowers bloom from midsummer into fall, releasing a delightful anise fragrance when brushed. Hardy in zones 4 to 9, it thrives in full sun and well-drained soil. Anise hyssop is not only a favorite of butterflies but also bumblebees and hummingbirds. Its aromatic foliage can be used in teas, adding another layer of enjoyment for those who grow it.

Tatarian Aster (Aster tataricus)

Tatarian aster is a gigantic perennial that can grow four to six feet tall and two to three feet wide! From late summer into early frost, it puts on a display of dense, lavender-blue flower clusters that become a late-season feast for butterflies. The migrating monarchs passing through my garden find it irresistible! Hardy in zones 3 to 8, it’s well suited for the back of borders where it can show off its towering blooms. Tatarian asters are vigorous growers and can spread quickly, so give them room to thrive.

Boltonia (Boltonia asteroides)

Boltonia, also known as false aster, is a showstopping perennial that can reach heights of four to six feet, with a spread of two to four feet. Its profusion of small, star-shaped white to pale lavender flowers appears from late summer into fall, resembling a cloud of tiny daisies. Hardy in USDA zones 3 to 10, Boltonia flourishes in full sun and moist soils. This plant is an invaluable nectar source for migrating butterflies and is beloved for its ability to attract clouds of pollinators during the autumn months, including the skipper shown in the photo.

Frost Aster (Symphyotrichum pilosum)

The frost aster, formerly known as Aster pilosus, is a delicate, airy perennial that reaches two to three feet in height and about the same in width. Its small white flowers with yellow centers bloom abundantly from early autumn until the first hard frost. Hardy in zones 3 to 8, frost aster is undemanding and tolerant of a variety of soils. It provides critical late-season nectar to butterflies and other pollinators as they prepare for migration or overwintering.

Tall Tickseed (Coreopsis tripteris)

Tall tickseed is a statuesque perennial, soaring six to eight feet in height and spreading up to three feet. Its slender stems are topped with bright, yellow, daisy-like flowers from late summer through fall. I pinch my plants back in late May to further delay their fall bloom time and keep the plants from getting too floppy. Hardy in zones 4 to 9, Coreopsis tripteris loves the sun and tolerates poor soil. This easy-care native is a favorite for both butterflies and native bees, and its cheerful blooms sway beautifully in the autumn breezes.

Ironweed (Vernonia species)

Ironweed is a striking presence in the late-season garden, with clusters of vivid purple flowers atop sturdy stems that can reach four to seven feet tall and two to four feet wide. Blooming from late summer into fall, ironweed is hardy in zones 4 to 9. If you pinch the plants back in mid-May you can further delay the bloom time by a few weeks to ensure lots of late blooms for butterflies. It prefers moist, well-drained soils in full sun. Ironweed is known for its resilience and for attracting not only butterflies but also bees and other pollinators. Its deep color and strong stature make it a dramatic accent in naturalistic plantings.

Additional Tips for Supporting Butterflies in Autumn

• Plant a variety of flower shapes and colors to attract a diverse range of butterfly species.
• Allow some leaf litter and brush piles to remain for overwintering butterflies.
• Avoid using pesticides or herbicides, which can harm butterflies at all life stages.
• Provide shallow water sources, like a damp sponge or a birdbath with rocks for perching.
• Leave some spent flower heads for shelter and as a late-season food source for other wildlife.
• Grow native grasses and host plants to support butterfly larvae and pupae.
• Cluster late-blooming perennial flowers to create attractive, nectar-rich patches that are easier for butterflies to find.
• Observe and record the butterfly species that visit your garden to better understand local migration and overwintering patterns.
• Don’t forget to include host plants for butterfly caterpillars in your garden.

An Autumn Butterfly Haven

By incorporating these late-blooming perennial flowers and following a few thoughtful gardening practices, you’ll create a haven for butterflies well into the fall and enjoy a lively and colorful autumn garden. The flutter of orange wings or a surprise visit from a painted lady will remind you that your efforts make a lasting difference for these beautiful pollinators—well into the fall and beyond.

Which species of butterflies have you found in your late-season garden? I’d love to hear about it in the comments below!