Farmer Jimbo is a farmer who was involved in the saga of the protected tree, west of the western Varrockbank. He was in charge of growing and looking after the tree's third iteration, after the second one died before he could arrive to heal it.
He was initially found by the Timbo tree in Yanille, and revealed that he is an esteemed farmer and tree surgeon whose help is requested by a lot of people, including kings and queens. He then remembers that he was on a journey to Varrock, as King Roald had requested his help with healing the protected tree found near the western bank.
He also lamented that he was unable to get to the Timbo tree in time to heal it. On his trip from Yanille to the protected tree, he stopped by various farming patches, mentioning he was investigating certain trees during his travels. He also commented on the state of the (fruit) tree growing in the patch. After arriving at the protected tree, he replaced the dead tree with a new sapling.
Farmer Jimbo features in the 2016 Easter event, taking a tour of Sliske's chocolate factory as one of the five golden ticket winners. During the event, he briefly became one of Sliske's wights.