By Hardly Kephart:
Tear out a section of your lawn. Many species of solitary bees require access to bare ground and cover for nesting, so a wall-to-wall green carpet prevents that. Wild mason bees love to nest in hollow tubes, and are encouraged by dried canes, such as raspberry, elderberry and snowberry.
View invasive plants as your mortal enemies and smite them with your righteous wrath. Flora such as: Himalayan blackberry, Scotch broom, Japanese knotweed, English ivy, pokeweed, gorse, tree of heaven…and many others. Native bees need native plants.
Avoid synthetic pesticides, fungicides and herbicides, especially those containing glyphosates (Roundup) and neonicotinoids. Neonics will appear on the label as acetamiprid, clothianidin, dinotefuran, imidacloprid and thiamethoxam.”