Use a string trimmer to finish your lawn. This ensures that you also keep the hard-to-reach corners tidy, which you can't easily reach with a lawn mower. You can choose from a string trimmer that works on electricity or a battery. An electric string trimmer is often more affordable, but you need extension cords. A battery-powered string trimmer provides more freedom of movement, but you're dependent on the battery life. The larger your garden, the larger the string trimmer with blades or string trimmer with strings has to be.