Mint is a useful and inexpensive herb that can repel flies, mosquitoes, ants and even mice. You can use mint in both forms i.e. in fresh or dried form.
During summer, flies torment us a lot. They are carriers of diseases. No wonder, we can make use of Pudina (Mentha or Mint) to repel flies. Just keep crushed pudina in a bowl, or scatter it around the infested place. You can also hang bunch of pudina near your windows. The smell of pudina will keep the room fresh while blocking entries of flies. Try this homely tip.