Patchouli is not hardy here in zone 6b but it's worth growing. It is a pretty plant, smells wonderful when you brush by the leaves and if you dry them you can make essential oil or tincture.
It blooms in the fall so I haven't seen the blooms yet but I did find this picture on the internet of the flowers.
Patchouli grows fast and is pretty easy to care for. I have mine in a low bowl type pot and it doesn't get a ton of water. If it wilts, just give it a drink and it pops back in no time.
It is is good insect repellant. I'm going to add it to the mix in my favorite Mosquito spray.
lemon grass oil
Patchouli oil or Tincture
Witch Hazel as a carrier liquid
I use a tablespoon of each the oils and top off a 8 oz spray bottle with Witch Hazel. Shake and spray every couple of hours for a bug free day.