One of the three varieties of pipe-weed recorded as being the most sought-after, the other two being Old Toby and Southern Star. Longbottom in the Southfarthing was the first place in the Shire where pipe-weed was grown, and so Longbottom Leaf must have been one of the oldest and most established types (if not the original variety). The first Leaf-grower was Tobold Hornblower, and his family continued the tradition. When Merry and Pippin found barrels of Longbottom Leaf in the ruins of Isengard, they bore the brand-marks of the Hornblower Family.
The Lord of the Rings Online
In The Lord of the Rings Online, the smoke from Longbottom Leaf takes the form of a horizontal smoke ring that appears behind the character's head. This effect appears to be broken or bugged. From the front, only the default cloud of thick smoke can be seen.