On a June evening in Boonsboro the ballfields at Shafer Memorial Park fill with families, fireflies start blinking along the tree line, and the smell of new-cut grass drifts over the neighborhood streets. TK & Sons Enterprise provides lawn care here, mowing and trimming residential yards so they are ready for exactly those long summer nights. Heat builds through July in the valley, and steady cutting stops a lawn from turning shaggy in the humid stretch of midsummer. Clean edges along driveways and sidewalks finish the picture. It is the kind of yard that makes you want to pull up a lawn chair and stay out until dark.