Smooth senna

Senna septemtrionalis (Viv.) H.S.Irwin & Barneby

Family: Fabaceae

Pet & Human Safety

People: No hazard foundPets: Not on the ASPCA lists as we read them

Hazardous parts

Not yet checked.

Preparation

n/a

Hazard type

Not yet checked.

Hazard route

Not stated by our sources (not a clearance). Detail: no human-hazard statement on the page

How complete this information is

We have not researched the safety of this plant yet.

Toxic to pets

No ASPCA entry found.

ASPCA index has no Senna septemtrionalis page. Do not treat as pet-safe.

PlotAndPetal cannot tell you whether a plant you found can be eaten. Only someone who can see the plant can identify it.

Look-alike warning

Could be mistaken for Other plants with a similar name or look. To tell them apart: Match on the scientific name, Senna septemtrionalis (Viv.) H.S.Irwin & Barneby (CONAFOR and Kew WCVP agree; the spelling follows CONAFOR and WCVP), not on the common name.. The Spanish common name "candelilla" collides with another plant: the Celaya list gives it to Euphorbia antisyphilitica. Check the botanical name. The spelling "septemtrionalis" follows CONAFOR and Kew WCVP.

Poison control

If someone has collapsed, cannot be woken, is having a seizure or has trouble breathing, call 911 now. For any other possible poisoning, call Poison Help: 1-800-222-1222.

Emergency number source: U.S. federal law (47 U.S.C. § 251(e)(3)), read 2026-10-07.

Naturalist Lore

Historical Background & Breeding Lore

The history of this plant and its name, and how it was bred, where we have them.

Get the app: coming soon

Care

Hardiness zones: Not checked yet
Light: direct sun (Celaya planting table).
Water needs: low; Celaya municipal planting schedule (a weak source for plant needs): water every third day while establishing, then every third day. low is a plain-language reading of CONAFOR (tolerant of drought; frequent in disturbed secondary growth). Finger-test two inches down.
Mature size: MX: CONAFOR: up to 6.5 m (about 21 ft) tall; fast growth; MX Celaya table: Celaya planting table: 2.0 m to 4.0 m tall, crown 2.0 m

Soil & Drainage

Pruning & Flush Rhythm

Feeding Schedule

How to prepare the soil, when and what to feed, and how and when to prune where that applies.

Get the app: coming soon