Carlsbad is preparing to launch an “aggressive” effort, including the widespread application of a chemical herbicide, to eradicate the invasive plant Ward’s weed from about 200 acres where it has taken root in several of the city’s habitat preserves.

A native of the Mediterranean region, the species’ first North American appearance was in Carlsbad’s Rancho La Costa Preserve in 2008. Since then, the plant has spread to the undeveloped habitat management areas east of El Camino Real between Palomar Airport Road and Alga Road.