04/25/2026
INVASIVE JUMPING WORMS
Invasive jumping worms (Amynthas agrestis), also known as "crazy worms," have been identified in the Pacific Northwest. These pests destroy soil structure, leaving it with a texture similar to coffee grounds, and are identified by their frantic, snake-like movement and a pale, smooth ring (clitellum) around their bodies.
Key Facts & Management
Behavior: They live near the surface and thrash violently when handled.
Impact: They degrade soil, damage plant roots, and deplete nutrients, harming gardens and forests.
Spread: They spread through infested soil, compost, mulch, and potted plants.
Action: If found, they should be destroyed by placing them in sealed plastic bags, alcohol, or by utilizing solarization.
Reporting: Washington residents can report sightings on the Washington Invasive Species Council website.
Identification Tips
Movement: Thrash or "jump" like snakes.
Appearance: Glossy gray or brown, 1.5 to 8 inches long.
Clitellum: White or light-colored band that is smooth and goes all the way around the body, unlike native worms.
Soil Sign: Surface soil looks like "ground beef" or coffee grounds.
According to the University of Minnesota, these worms are hard to control because their cocoons survive winter. To stop the spread, avoid moving soil or mulch from infested areas.