Bug Repellent Plants

Episode 1 pic of lemon balm
Lemon Balm is a member of the mint family and particularly good at keeping biting insects away, but it's also an invasive species, so be careful when growing it. 
Episode 1 pic of capnip
Catnip is a fragrant mint cousin containing a chemical called nepetalactone, which is a useful insect repellent. 
Episode 1 pic of basil
Basil has an essential oil that is toxic to mosquito larvae. 
Episode 1 pic of lavendar
Lavender repels flying insects like mosquitoes, moths, and flies.  The flower's perfume is well-known, and while it will scent the air, it's still most effective when actually rubbed on skin.