Kill grass. Undiluted vinegar kills grass between bricks and sidewalk cracks.
Kill weeds. Spray full strength on weeds, but be careful not to spray it on the surrounding grass because it will kill that, too.
Deter ants. Spray vinegar around doors, appliances and along other areas where ants are known to gather.

Freshen cut flowers. Add 2 tablespoons of vinegar and 1 teaspoon sugar for each quart of water.