Lawn maintenance is a set of activities that help keep the lawn and outdoors clean throughout the year. It involves preparing it for every season (prepare for spring, clear winter debris, summer lawn mowing, clean-up of yard before winter). Usually, it includes weekly lawn mowing, watering and weeding, border edging, clean up, and removal.
On the other hand, lawn care is about keeping the garden healthy, colorful, and vital throughout the years. It can involve other lawn services like pest and weed control, fertilization, soil testing, seeding, and irrigation, among others.