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Pipe-weed (also known as Halflings' Leaf) is grown and enjoyed much by the hobbits of the Shire, to whom it was first introduced by Tobold Hornblower. It was first grown among hobbits by Tobold Hornblower in Longbottom (a region in the Shire) around S.R. 1070 (TA 2670). Despite its foreign origins, the hobbits (possibly those in Bree) were the first to use it for smoking.
Pipe-weed production is a major industry there, especially in the south. It was known among the Dúnedain as sweet galenas for its fragrance.
In Gondor, it is known popularly as Westman's-weed and grows as a wild plant, appreciated primarily for its sweet-scented flowers. The colloquial name is in reference to its origins: it was apparently brought to Middle-earth by Númenóreans during the Second Age.
Popular varieties of pipe-weed include Longbottom Leaf, Old Toby (which is 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 is 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 that Saruman has had commerce with the Shire.