Rats are congregated and get settled in garden areas. No matter how small or big your garden is, it can be a habitat for them.
You can find various rats like Brown rat, House mouse, Wood mouse, Field vole and, Bank vole in your garden areas. Plan out rat traps like glue traps, snap traps and bait traps. This is an immediate solution to your problem.
If you are trying to use poisons or toxins for your bait then this might get tricky. Seek professional help from
Roseville Pest Exterminators in CA or you can visit
https://www.rosevillecapestcon...
Also make sure you keep your garden clean by removing wood clippings, residues and cutting long grass.
This will help you eliminate the rats in your areas.