Two Leaved Senna
Senna roemeriana
Last reviewed: September 2026
Toxicity unknown
Two Leaved Senna (Senna roemeriana) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
low
Size
12"–36" H × 12"–24" W
Bloom
Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
Native to
NM, OK, TX
Pollinators
butterflies, bees
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBrowse plants for this ecoregion
Two Leaved Senna is a compact native shrub that produces bright yellow flowers from spring through fall. This drought-tolerant plant maintains a neat, rounded form and requires minimal care once established.
In an HOA neighborhood
Two Leaved Senna is an HOA-friendly choice in the right placement. Maintenance level: moderate. Tidiness: 4 out of 5.
Works well in: foundation, mid zone.
- Requires annual shaping to stay compact
Wildlife value
The abundant yellow blooms attract butterflies and native bees throughout the growing season. This plant serves as a host for sulfur butterfly caterpillars.
Common questions
- How much sun does Two Leaved Senna need?
- Two Leaved Senna grows best in full sun conditions.
- When does Two Leaved Senna bloom?
- Two Leaved Senna blooms in March, April, May, June, July, August, September, October, and November.
- Where is Two Leaved Senna native?
- Two Leaved Senna (Senna roemeriana) is native to NM, OK, TX, per vouchered herbarium specimen records and regional native plant society lists.
- What pollinators does Two Leaved Senna attract?
- Two Leaved Senna draws butterflies and bees.
- Is Two Leaved Senna HOA-friendly?
- Two Leaved Senna is generally an HOA-friendly choice in the right placement, with moderate maintenance.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Two Leaved Senna? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
Not sure where to start? Take the 2-minute yard quiz