Cater to Critters. Singing birds and fluttering butterflies add sensory sparkle to any size garden. In the garden shown here, carefree natives line a walkway leading to a potting shed. Wild grasses -- including switchgrass and little bluestem -- offer year-round interest. Perennials such as coneflower, New England aster, prairie coneflower, and butterfly weed provide color and nectar.