By eight in the evening in June, Chickamauga has cooled to a soft blue, cicadas trading off in the trees and fireflies coming up out of the grass. Langston Lawn Services spends the daylight ahead of that hour — mowing, string trimming, edging, and blowing the walks clean so the yard is done before the porch lights come on. Grass grows fast here in early summer and it needs a hand that keeps pace with it. What a homeowner gets is the plain pleasure of a lawn that is even underfoot and tidy at every border. It's honest work, and the evidence of it stands there for anyone walking by.