Priest Cain:
Pick it? No no--I have a supplier already, only he's a forgetful type and I fear he's just forgotten to send me the package.
I need you to visit my supplier, Herb Collector Eric, and bring me the herbs that he should have already gathered. He's normally found in the Enchanted Valley, so I'd suggest you start your search for him there.
Godspeed my friend. Be safe.