This perennial plant can grow up to 2-3’ tall and wide. This is sometimes confused with the many other somewhat-related plants called “blue mist” plants that are in the genera Conoclinium, Chromolaena, Eupatorium, Ageratina, etc. This species has entire leaves (not divided). White or blueish purple flowers can come out in the warm season almost any time but heaviest in the fall.

Full to part sun, moderate water in improved soil with good drainage, hardy to 15°F. Cut back as needed.

This species has pyrrolizidine alkaloids (PAs) that are utilized by some butterfly species for attracting mates, as well as rendering themselves, and their eggs, less edible to predators. Because of this and the nectar-rich flowers, this species is extremely attractive to butterflies.

Native in crevices, ledges, cliffs, other rocky sites in canyons, along streams, in desert grasslands, oak-agave, oak, oak-juniper, and pine-oak woodlands in Arizona, New Mexico, and most of Mexico down to Nicaragua at 4000'-6200 ft in elevation.

Photo by mgomezperalta on iNaturalist
Ageratum corymbosum on SEINET