Climbing Aster: A Late Fall Feast for Bees

For most of the summer, my climbing aster quietly covers its wooden trellis in green. Then, in early October, the buds appear and the waiting begins. By late October, the flowers open, continuing for weeks into November. With little else blooming in my garden, it is covered with bees and  other pollinators.

Now three years old and about eight feet tall, this southeastern native has become a wonderful example of why late-blooming plants deserve space in our gardens. Just when the flowering season seems nearly over, climbing aster provides another generous helping.

Getting it to this point took some patience—and chicken wire. Rabbits were a problem when the plant was young, so I enclosed its base in a protective cage. It probably would have reached 10 feet without the bunny nibbling.  It gradually grew up the trellis and beyond the cage, but this was no overnight transformation. Though climbing aster is often described as vigorous, mine took its time getting established.

All summer, I watched that green framework grow. When it finally budded up in early October, I was ready for the show. The weeks of flowers and constant bee activity made the wait worthwhile.

A Native Aster with a Different Habit

Climbing aster, Ampelaster carolinianus, brings the familiar daisy-like aster flower to an unexpected place: up a trellis. Its long stems scramble over supports and through neighboring branches, carrying fragrant lavender-pink flowers with yellow centers. A fence, sturdy trellis, or established shrub gives it something to lean on as it grows. Sharing a space with a climbing rose, I get two blooming seasons from the same space.

Native to the southeastern United States,  it occurs along stream banks, swamp edges, and moist woodlands. Here in Maryland, I am growing a southeastern native beyond its natural range—a useful distinction when talking about native plants. And this summer has been dry- so no moist woodlands.

Why Asters Matter for Biodiversity

Watching the bees work my climbing aster makes the value of late flowers easy to understand. A garden’s food supply needs to last beyond the abundance of spring and summer.

Native asters help fill that seasonal gap, providing nectar and pollen for insects still active in autumn. Their contribution extends beyond the flowers: many asters also serve as host plants, supplying leaves for butterfly and moth caterpillars. Some native bees specialize in gathering pollen from asters and related plants.

Climbing aster has its own wildlife connections. North Carolina Extension lists it as a host for pearl crescent butterfly caterpillars and notes that its flowers attract bees and butterflies. Songbirds and small mammals also eat the seeds. One plant can provide food in several forms, at different stages of its life.

That is what supporting biodiversity looks like in a garden: flowers being visited, foliage feeding insects, and seeds becoming another meal. The activity around a plant can be as compelling as the flowers themselves.

Growing Climbing Aster

Give climbing aster room to develop and a sturdy support. Mine has reached about eight feet, and plants can exceed ten feet under favorable conditions. Based on my experience, protecting a young plant from rabbits may be just as important as choosing the right trellis.

Mt. Cuba Center lists climbing aster for USDA Zones 6–9 and recommends full sun with average to moist, well-drained soil. Established plants can tolerate some drought. Its loose, rambling habit is particularly effective where it can mingle with surrounding plants or drape over a structure.

And give it time. My plant spent its early years gradually growing beyond its rabbit cage and up the wooden trellis. Now, when I walk into the garden in late October and November, its flowers—and the bees covering them—give me a reason to linger.