Though the recent heat wave has slowed growth in local yards, the Hartley City Council is still hoping to clamp down on residents who don't mow.

Council members on Monday approved changes to the city's grass ordinance. Now, people who fail to keep the length of their grass at 6 inches or less will receive only one warning per calendar year instead of receiving official notice each time their yard is breaking the rules.

A certified letter will be mailed the first time a property owner offends, with a placard being placed on their yard each subsequent time it needs to be mowed. The fee for th...