If you give the addict in the schoolhouse Drudane, he will mark the location on your map, saying
Awwww buddy! This is the good stuff too, like what Kemm has in his garden with the Yarrow. Like right... therrre.
Did you check out the area where you found the flower more closely?
Dig there, and you can find a backpack with random loot and some Drudane.