This was one of my more difficult herbs to locate, but I finally did find one at a local nursery. It is a beautiful plant, with a taproot, so be certain where you want to plant it (does not take too kindly to moving). On a hot summer night, you can hold a match over the flowers and the volatile oils will ignite - cool trick! It also is said to ward off the plague. For these reasons, I have this in the magical section of my herb garden. Unfortunately, the slugs also really love this plant and I may have lost it this year. It was nibbled to the ground more than once, and I'm really not sure if it ever got enough growth to sustain it through the winter. I'm hoping the tap root will be strong enough to send up new shoots this spring, and I will definitely plan to give this plant a slug necklace if it survives.
http://garden.org/ideas/view/B...
Caution: Some folks are sensitive to the oils of this plant and may develop a rash from it.