All bees are very important for pollination. To keep solitary bees in your garden, build them a house. My husband made a simple one from a 4x4 cut about 15" inches long, with one end cut on a slant. He then drilled several rows of holes about 2 inches deep with varying sizes from 1/6 to 3/8 of an inch. Lastly, he cut a board somewhat larger than the first and nailed it to the slanted end as a roof. Attach the new bee house to a fence or tree for happy bees!!