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Barrel cacti in bloom along a path at Agua Caliente Park. -- Credit: Doug Kreutz / Arizona Daily Star

Researchers at the Carl Hayden Bee Research Center are studying the effects of fertilizers on the nutritional quality of pollen.

Large sunflowers are flourishing at the University of Arizona Campus Agricultural Center.

A lone sunflower at the edge of a field of blooms stands out against horses in the background at the University of Arizona Campus Agricultural…

Vast fields of brilliant sunflowers are blooming at the University of Arizona Campus Agricultural Center. -- Credit: Doug Kreutz / Arizona Daily Star

Large sunflowers are flourishing at the University of Arizona Campus Agricultural Center. -- Credit: Doug Kreutz / Arizona Daily Star

Golden columbines and other wildflowers are flourishing high in the Catalina Mountains following heavy monsoon rains.