A processing unit for solitary bees is utilized in a method of timely providing a sufficient number of bees for pollinating a flowering crop. The processing unit provides secure storage for the solitary bees at every stage of their life cycle, and provides precise control of environmental conditions to ensure that the bees complete each stage of their life cycle in the optimum state of health and viability, and to ensure that adult bees emerge in close agreement with predicted emergence. The processing unit provides for protection against parasites, predators and pathogens, and may provide for feeding and mating of the bees. The processing unit may be used with any type of solitary bee nest. The processing unit may be fabricated in modularized components, allowing for increased capacity as required.
