You either have to have a bog house in Chakra, Shimla, Jethimadh, or Kalavana. Or alternately, you can use a community herb garden in one of those areas.
Check out the post I just made about a bog house. :)
You can get the flowers' seeds from the Ancestral Lands or by shucking the flowers you find elsewhere in the world, and then you can plant them in the places that Sugarbritches mentioned :)