Sabino Canyon is abloom with what might be called a barrage of saguaro blossoms this month.

Some large saguaros in the canyon have had more than two dozen blooms open at a time, with many more buds promising flowers for later.

“This is just amazing — so many blooms!” said Jodi Davis, a visitor from Champaign, Ill., who took photo after photo of flowering saguaros along the canyon’s Bajada Loop Nature Trail.

FLOWERING FACTORS

Cactus experts say the intensity and timing of saguaro blooms can vary around the Tucson area depending on factors such as elevation, temperature and whether an area has mainly a southern or northern exposure.

“Even within the Tucson basin watershed, we can see a week to 10 days difference in bloom peak from the lower, warmer Tucson Mountains to slightly cooler and higher Pusch Ridge (in the Catalina Mountains) and the foothills of the Rincon Mountains” east of Tucson, said John Wiens of the botany department at the Arizona-Sonora Desert Museum west of Tucson.

“We seem to be seeing a nice, but fairly typical bloom around the west side” of the Tucson Mountains, compared with the robust bloom in Sabino Canyon, Wiens said. “We’ve been keeping flowering records on saguaros around the Desert Museum since 1982. We’ve seen flowering start as early as the first week in April and as late as the second week in May. The length that the population around here is in bloom ranges from four weeks to eight weeks.”

Some flower watchers aren’t aware that an individual saguaro bloom lasts just one day, although a single saguaro can produce many buds and continue blooming for weeks.

Saguaro pollinators include white-winged doves, lesser long-nosed bats, honeybees and moths.

After becoming powdered with sticky pollen as they feed on the flower’s nectar, they travel from flower to flower, transporting pollen and fertilizing as they go.

Following the blooming season, saguaro fruit ripens in June and July.

VISITING SABINO CANYON

The canyon is at 5700 N. Sabino Canyon Road.

Visitors pay a day-use fee of $5 per vehicle.

Contact reporter Doug Kreutz at dkreutz@tucson.com or at 573-4192. On Twitter: @DouglasKreutz