Bring Balnir Snapdragons to Anastasia Hartwell in the Mage Quarter of the Undercity.
The Plaguelands to the east are an aberration. Devised by the Lich King, they spread their magic into the soil, corrupting and killing all that live. Although there is a certain charm to the destructive forces of the plague, we, the mages of the Forsaken, believe it is unruly and must be curtailed.
But first, we must measure how far it has spread into Tirisfal. Go to the Balnir Farmstead in eastern Tirisfal. In the garden are flowers--snapdragons. Gather these and return.