Magic beans

Magic beans are a quest item used during the Grim Tales. They are given to the player by Sylas, an old man in Taverley who will exchange them for a griffin feather and Rupert's helmet. The beans can then be planted in a special farming patch in Taverley to grow a giant beanstalk. This patch has a nearby sign that when examined says that on the patch the farming is prohibited.

Trivia

 * When talking to Sylas without starting the Grim Tales Quest he will not sell you any beans but will still ask you to buy them.