The aromatic leaves, stems, and flowers of a mint plant repel mosquitoes. But keep this one confined to a pot—it spreads aggressively and could overtake your small garden. Instead, place planters brimming with mint around the patio to create a pest-free zone for your enjoyment. If you'd like, you can even make a natural insect repellent by mixing mint oil with apple cider vinegar and witch hazel. A light misting when you're outdoors will shoo irritating insects away.