This quest is not available in game.
Bring 10 Morrowgrain to Quintis Jonespyre in Feathermoon Stronghold.
Let me to be frank with you, <name>. I'm interested - nay, concerned with why the Arch Druid in Darnassus is using the name of the Cenarion Circle as well as the Circle's resources to procure vast amounts of morrowgrain. I'm a researcher - curses are my specialty. I've heard that morrowgrain, under the right conditions, exude qualities like other herbs used in primitive curses.
I want to know more, and I ask for your help. Bring me ten morrowgrain, and I will be sure to take care of you.