Solitary bees have one generation per year. In the spring, solitary bees will emerge from underground nests, and the females and males will mate. After mating, the females will dig a hole about ¼ of an inch into the ground, will create tunnels and burrows, and will lay their eggs in the nest. The female gathers and places nectar and pollen in the nest, which the larvae will feed on once they hatch. The larvae feed, grow, and develop in the ground until the next spring when they emerge as adults and begin the lifecycle over again.