Rattlebox
Crotalaria spectabilis
Last reviewed: September 2026
Toxicity unknown
Rattlebox (Crotalaria spectabilis) 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.
Rattlebox is listed as toxic to grazing livestock (cattle, sheep, and goats) at a moderate level by the USDA PLANTS Database (opens in new tab). This is a livestock indicator and is separate from pet toxicity.
Light
full sun
Water
low
Size
12"–36" H × 12"–24" W
Bloom
Jun, Jul, Aug, Sep
Pollinators
bees, butterflies
Native alternatives to Rattlebox
Rattlebox is not native to the United States. These natives fill a similar role in a planting, matched on bloom season, bloom color and mature size.
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 areaRattlebox is a tall annual wildflower that produces bright yellow pea-like flowers from summer through fall. This upright plant grows quickly and self-seeds readily, making it better suited for naturalized areas than formal landscapes.
In an HOA neighborhood
Rattlebox takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Plant contains toxic alkaloids that may concern HOAs
- Can appear weedy or wild in formal landscapes
- May self-seed aggressively
Wildlife value
The abundant yellow blooms attract bees and butterflies throughout the long flowering season. However, all parts of this plant are toxic to humans and livestock.
Common questions
- How much sun does Rattlebox need?
- Rattlebox grows best in full sun conditions.
- When does Rattlebox bloom?
- Rattlebox blooms in June, July, August, and September.
- Is Rattlebox toxic to livestock?
- Rattlebox is listed as toxic to grazing livestock such as cattle, sheep, and goats (moderate severity) by the USDA PLANTS Database. This is separate from pet (dog and cat) toxicity.
- What pollinators does Rattlebox attract?
- Rattlebox draws bees and butterflies.
- Is Rattlebox HOA-friendly?
- Rattlebox takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
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 Rattlebox? 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