Pipe-weed (also known as Halflings' Leaf) was grown and enjoyed much by the hobbits of the Shire, to whom it was first introduced by a hobbit named Tobold Hornblower. It was first grown among hobbits by Tobold Hornblower in Longbottom around SR 1070 (the year 2670 in the Third Age). Despite its foreign origins, the hobbits were the first to use it for smoking.
Pipe-weed production was a major industry in the Shire, especially in the south.
It was known among the Dúnedain as sweet galenas for its fragrance. In Gondor, it was known as Westman's-weed, and grew there as a wild plant, appreciated primarily for its sweet-scented flowers. The colloquial name was in reference to its origins: it was apparently brought to Middle-earth by Númenóreans during the Second Age.
Popular varieties of pipe-weed included Longbottom Leaf, Old Toby (named after Tobold Hornblower), Southern Star, and Southlinch, which is grown in Bree.The Wizard Gandalf learned to smoke pipe-weed from the hobbits and was known to blow elaborate smoke-rings. Saruman initially derided him for this, but at some point he took up smoking himself. After the destruction of Isengard, pipe-weed was found among its stores, but the hobbits Merry and Pippin failed to realized the sinister implications of the discovery of Saruman's having commerce with the Shire.