When a gardener comes and neatly trims the lawn, this is an example of a time when the gardener manicures the lawn.
When you cut someone's nails and polish them, this is an example of a time when you manicure.
When you go to the salon and your hands are soaked in a paraffin bath, then massaged before your nails are clipped and polished, this is an example of a manicure.
Manicure a hedge.
To manicure a lawn.