Use an Evergreen Pouch with a Packet of Tharlendis Seeds and two Un'Goro Soil samples to try and cultivate samples of Morrowgrain.
Bring 10 Morrowgrain to Mathrengyl Bearwalker in Darnassus.
Here's your Evergreen Pouch that you'll need to use the Tharlendis seeds with. You also need to have Un'Goro soil samples on hand to use as fertilizer for the seeds. Just use the pouch when you have everything; the pouch will take care of the rest.
When you have enough morrowgrain, bring them here to me in the enclave. Please don't bother the Arch Druid; he's a very busy man, and he doesn't need to be disturbed every time someone returns with another batch of morrowgrain!
You will receive:
Yes <name>, have you grown some morrowgrain for the Arch Druid's important research? The mysterious properties of Un'Goro Crater become clearer with each passing day, thanks to the help you are giving us.
Well done <name>, I will be sure to give these to the Arch Druid himself when he has need of them. Meanwhile, please accept this as a token of the Cenarion Circle's appreciation.
Our need for morrowgrain, for now, is constant; if you wish to continue aiding us, then please return when you have cultivated more of it.
Upon completion of this quest you will gain: