You can find the Arvel Plantation east of Pelagiad, on the Ascadian Isles. You can find some corkbulb root just west of the Suran silt strider (near the Ules manor slave shacks). There are also some growing along the road between the Arvel and Ules manors. If you cannot find all five units of the root there, try checking at the Llovyn farm, southwest of the Dren Plantation (though any corkbulb will work).
The following Journal ID and Index codes can be used with the Journalconsole command to manually update the quest to a certain point.
Gathering Corkbulb Root (IC5_corkbulb)
Index
Finishes Quest
Journal Entry
1
Synnolian Tunifus needs five units of corkbulb root for cure common disease and restore health potions. The Imperial Cult has an agreement with the Ascadian Isles plantation owners that permits us to gather corkbulb, so that's a good place to look. Since I have to cross water, he taught me a little spell.
5
Finishes quest
I told Synnolian Tunifus I would not be able to bring him the five units of corkbulb root he asked for. He was disappointed, and told me to take a day to reflect on my shortcomings, and attempt to amend them before I approach him again for a lay healer mission.
50
Finishes quest
I delivered five units of corkbulb root to Synnolian Tunifus. He gave me a cure common disease potion and a restore health potion as a reward.
Gathering Corkbulb Root (IC5_corkbulb_not)
1
Finishes quest
I told Synnolian Tunifus I would not be able to bring him the five units of corkbulb root he asked for. He was disappointed, and told me to take a day to reflect on my shortcomings, and attempt to amend them before I approach him again for a lay healer mission.