The answer to 'how to maintain landscape lighting' is to regularly inspect, clean, and repair your landscape lighting system. This includes checking for any loose connections, replacing any burnt-out bulbs, and ensuring the lighting is properly aimed and focused. You should also trim any overgrown vegetation that may be blocking the light.
It's important to perform this maintenance on a regular basis, typically every 6 months or so, to keep your landscape lighting functioning properly and safely. If you encounter any major issues or need to make significant repairs, it's best to call in a professional landscaper or electrician to handle the work.