Un'Goro Soil

Un'Goro Soil could be found in Un'Goro Dirt Piles on the ground in Un'Goro Crater. It also drops off several mobs there.

As a quest objective

 * Un'Goro Soil (quest)
 * Morrowgrain Research (Alliance, 2)
 * Morrowgrain Research (Horde, 2)
 * Bungle in the Jungle