Although people think of mosquitoes as flying pests, they actually start as squirming larvae that live in stagnant water. Eliminate all sources of standing water in your yard to break the mosquito life cycle and eliminate the adult population. Put away empty pots, wheelbarrows, rubber tires and other landscaping tools and containers that may collect and hold water when it rains or when you water your garden. Additionally, check gutters. When gutters get clogged, rainwater builds in them and becomes a teeming breeding ground for mosquitoes.