When does American Senna bloom?

American Senna produces yellow flowers from July through September, providing late summer nectar for pollinators.

What pollinators visit Senna hebecarpa?

Bees and butterflies are the primary pollinators of American Senna, attracted to its bright yellow flower clusters during late summer.

Where is American Senna native?

Senna hebecarpa is native to much of the eastern United States, from New England south to North Carolina and west to Wisconsin, Illinois, and Missouri.

What growing conditions does American Senna prefer?

American Senna tolerates a range of light conditions from full sun to partial shade and adapts to various moisture levels, though it performs well in medium moisture soils.

Is American Senna HOA-friendly?

American Senna is generally an HOA-friendly choice in the right placement, with moderate maintenance.

American Senna

Name: Pollinator Patch
Author: Pollinator Patch

Senna hebecarpa

Last reviewed: July 2026

Senna hebecarpa (American Senna) is a native wildflower blooming July through September across the eastern United States. This deciduous perb attracts bees and butterflies with bright yellow flower clusters.

American Senna (Senna hebecarpa) — Photo: USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA / Wikimedia Commons (Public domain)

Light

part sun

Water

medium

Size

24"–60" H × 18"–36" W

Bloom

Jul, Aug, Sep

Native to

CT, DE, IL, IN and 16 more states

Pollinators

bees, butterflies

American senna is a native perennial that produces bright yellow flowers from summer through early fall. This upright plant has compound leaves and develops seed pods after flowering, creating seasonal interest in the landscape.

Growing American Senna

Grow American Senna in part sun and medium water. Mature plants reach 24 to 60 inches tall and spread 18 to 36 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

American Senna is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 3 out of 5.

Works well in: mid zone, foundation.

Can look somewhat informal during winter dormancy
Seed pods may be considered messy by some

Wildlife value

Host plant for cloudless sulphur butterfly, orange sulphur butterfly.

The bright yellow flowers attract various bees and butterflies during its long blooming period. Seeds provide food for birds and small wildlife.

Common questions

When does American Senna bloom?: American Senna produces yellow flowers from July through September, providing late summer nectar for pollinators.
What pollinators visit Senna hebecarpa?: Bees and butterflies are the primary pollinators of American Senna, attracted to its bright yellow flower clusters during late summer.
Where is American Senna native?: Senna hebecarpa is native to much of the eastern United States, from New England south to North Carolina and west to Wisconsin, Illinois, and Missouri.
What growing conditions does American Senna prefer?: American Senna tolerates a range of light conditions from full sun to partial shade and adapts to various moisture levels, though it performs well in medium moisture soils.
Is American Senna HOA-friendly?: American Senna is generally an HOA-friendly choice in the right placement, with moderate maintenance.

Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow American Senna? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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