It's a good idea to replace them at least once per year, and cleaning or replacing your plugs is a reasonable first step in resolving just about any starting problem. The clearest sign of plug trouble is when your engine will turn over but not actually start. It's a little easier to diagnose a bad spark plug in an engine that will barely start than one that won't start at all, and if you've recently noticed that your mower makes you pull the starter rope harder, is prone to losing power while running, or starts using more gas than normal, the plug might be the problem.
Buildup from a constantly exploding engine cylinder will eventually degrade the performance of the plug until it can't function properly at all. The most common culprit is probably a spark plug that needs cleaning or replacement.
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