Did you know that cockroaches hate the smell of peppermint, lavender, eucalyptus, and tea tree oils? That is because it disrupts and masks the scent trails which cockroaches use to hunt for their food. Roaches die when they are exposed to higher concentrations of essential oils, particularly peppermint oil. Therefore, plant your garden with these plants or put them in a pot or garden box in your kitchen. It will keep those unwelcome roaches away.