Storms build over the prairie west of Zion and come through in the late afternoon, and everything green takes the rain as an invitation. Two days later the lawns stand an inch taller than anybody wanted them. Mow-Mentum Lawn Care is built for that stretch of the calendar — mowing kept on pace, string trimming along fences and foundations, edges recut, clippings cleared off the walks and the drive. A lawn cut on time never looks like it needed anything, and that is the whole trick of it. On a June evening, with the light still up past eight and the block freshly mown, Zion smells like the good part of summer.