In Gondor it is said that it is free
a wild sort for anyone to find.
It can be found in both Shire and Bree
and some use it's strength to unwind.
Pipe-weed
Pipe-weed (also known as Halflings' Leaf or simply Leaf) was a plant developed by the Hobbits of the Shire.
Tolkien Gateway: Pipe-weed