The long backyards off Berdan Avenue hold the heat late, and on a July evening the fireflies come up out of grass that was cut that morning. John's Lawn Maintenance LLC keeps a good part of Fair Lawn on that schedule — weekly mowing, edging along drives and walks, trimming around posts and fences, and the cleanups at either end of the year. Grass here grows fast after a warm rain and wants someone who shows up regardless. The result is a yard you can cross barefoot without thinking about it. That is most of what a lawn is for.