Wild Senna
Senna hebecarpa
Family Fabaceae
Bright yellow and built for bumblebees — wild senna's midsummer flowers are buzz-pollinated, shaken loose by bees at exactly the right frequency, a show worth standing beside. At a shrubby 4-6 ft it carries real presence at the back of a sunny native bed.
Underground it fixes nitrogen for its neighbors; above, it hosts sulphur butterflies, recruits beneficial insects with tiny nectar glands, and holds dark seed pods that feed game birds through winter. Few plants do this many jobs from one root system — give it the back row and let it work.
Full Sun to Part Shade
Moderate water
Fast growth
Native to North America
Attracts butterflies
Attracts bees
From the print shop
Growing wild senna? Hang it.
Our Plant Library collection carries wild senna — Senna hebecarpa, print Nº 514, “Wild Senna.”
526 designsfrom $12.99white or black backgroundmatte poster, unframed
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what wild senna actually needs.
Hardy inZones 4-8Wild Senna · Common problems
Common wild senna problems
Pests
1 problem on file
- Almost none
Diseases
1 problem on file
- Almost none
Wild Senna · Growing & propagation
Growing wild senna
- Light
- Full Sun to Part Shade
- Water
- Moderate; adaptable
Soil- Rich, moist
Nitrogen-fixer · pH 5.5 - 7.0
Fertilizer- None
Fixes its own nitrogen
Pruning- Cut back in spring
A bold, shrub-like native legume — clusters of bright yellow flowers in midsummer that bumblebees buzz-pollinate, feathery foliage, and a nitrogen-fixing root that enriches the soil. It hosts sulphur butterfly caterpillars and its little extrafloral nectaries feed protective ants and beneficial insects. Dark pods persist for winter game-bird food. Big and handsome for the back of a native border.
Spacing- 2-3 ft
How to plant & propagate wild senna
- Propagate
- Division or seed
Wild Senna · Calculators & field guides
A little help in the garden.
Wild Senna · Yearly calendar
The wild senna year, month by month
Jan
HarvestDecember to February
BloomPrune
HarvestBloomJuly
PruneMarch to May
HarvestDecember to February
What each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
- Harvest — picking time — check ripeness every few days.
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
Wild Senna · Ecology & uses
Ecology & uses
Senna hebecarpa
Wild Senna in the garden system
- Herbaceous layer perennial
- N-fixer
- Nectary/insectary
- Hosts Sulphur butterflies (cloudless, sleepy orange)
- Attracts
- Butterflies, Bees, Birds
- Moisture
- Facultative / average
Deer- Browsed
Protect young plants
- Origin
- Native to North America
What wild senna is grown for
! Some parts toxic — see notesFoliage/seeds mildly cathartic if eaten (a folk laxative) — not an eating plant
- Use
- N-fixing native
- Use
- Butterfly host
- Use
- Bumblebees
- Use
- Back-of-border
Harvesting & storing wild senna
Dark seed pods feed game birds in winter.
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
Wild Senna · Varieties & cultivars
Choosing a wild senna variety
Species; Senna marilandica (Maryland senna, similar)
Sources & plant identity
Know what you’re growing.
See where the knowledge comes from.
Wild Senna
Senna hebecarpa
The plant, at a glance.
- Botanical name
- Senna hebecarpa
- Plant family
- Fabaceae
- Growth habit
- Perennial
- Origin
- Native to North America
- USDA plant symbol
- SEHE3
- Invasive risk
- Low
Hardiness, size and timing vary with your cultivar, soil and climate.
Rooted in research.
University extension research, brought together with hands-on growing experience at Story Thyme Farms.
Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
Questions
Wild Senna questions, answered straight.
Is wild senna safe for kids and pets?
With care. Foliage/seeds mildly cathartic if eaten (a folk laxative) — not an eating plant Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
When do you harvest wild senna?
Dark seed pods feed game birds in winter.
How do you propagate wild senna?
Division or seed.
Elsewhere
Where wild senna sits in the library.
Common Milkweed
Ironweed
Cup Plant
Helen's Flower (Sneezeweed)