Examples of perennials attractive to bees include clovers and milkweeds in the summer and asters and goldenrod in the fall. Native plants and wildflowers provide good clues as to what your bees will like. In addition to flowers, bees need a source of water if one is not nearby. A small pond, puddle, birdbath, or even dripping faucet fulfills this need. Bees need protection from predators, a place to call home.
Many bees live in old or dead wood, often in tunnels created by wood-boring beetles.
If you spot some elliptical holes in leaves on garden plants, they are likely from these bees gathering leaf pieces that they use for homes for their young. So, think of these bees before cutting down dead trees, or even limbs. Dead trees will also be attractive to several species of woodpeckers. The final point crucial to bee survival is to not use pesticides that will harm them. Either avoid using pesticides, or if this is not possible, use midday or preferably after dark when bees are not active.