Brittlebush wildflowers are on a blooming binge across the Tucson area — bolstered by drenching rains at the beginning of March.

The brilliant yellow flowers are creating a buzz for bees and people with cameras.

“It was the fall rain that triggered growth and eventual bloom, but the rain last week freshened the plants and will probably extend the bloom by a week or so,” said Mark Dimmitt, a wildflower expert and retired director of natural history at the Arizona-Sonora Desert Museum.

Dimmitt said he saw “tons of brittlebush in full flower along Interstate 10 between here and Phoenix” this week, with most growing along the shoulder of the road where plants get lots of runoff from rains.

Many roadsides around Tucson, and especially in the Catalina Foothills, are graced with a bumper crop of brittlebush.

Hikers on some trails — including the Pima Canyon Trail north of the city — pass stands of the dazzling plants brightening an otherwise brown-and-green landscape.

Contact reporter Doug Kreutz at or at 573-4192.

On Twitter: @DouglasKreutz