Identifying and Controlling Rattlebox (Crotalaria spectabilis)

What Is Rattlebox?

Showy rattlebox (Crotalaria spectabilis) is a native plant easily recognized by its distinctive seed pods that resemble English pea pods. As the common name suggests, shaking dry pods produces a distinctive rattling sound from the loose seeds inside.

Identification Features

• Bright yellow flowers
• Inflated seed pods that turn brown when mature
• Characteristic rattling sound when dry pods are shaken
• Upright growth habit, typically 2-4 feet tall

Toxicity Concerns

Despite its attractive flowers, rattlebox poses serious risks to livestock. All parts of the plant contain pyrrolizidine alkaloids that can cause liver damage and death in grazing animals. For this reason, it's classified as a noxious weed in agricultural settings.

Control Recommendations

Immediate removal is advised when rattlebox appears in pastures or areas accessible to livestock. Pull plants before seed pods mature to prevent further spread. Wear gloves when handling, and dispose of plants in sealed bags—do not compost.