Use Rina's Bough on 5 of the Grove Seedlings to summon forth defenses for the Living Grove. Then return to Rina Moonspring at Sylvanaar in the Blade's Edge Mountains.
Though you've done a great deal of good work in defense of our new home here, I still feel that the Living Grove needs more protection.
Please, take this small tree bough that I have imbued with the force of nature. When used upon the seedlings that I have planted out in the grove, it will call down a storm to accelerate the growth of a treant defender.
These treants are critical to the defense of the grove, especially if you choose not to make Sylvanaar your home for long.