Trader Minaless:
The Nightshade needs Zombie Dust as fertilizer. Zombie Dust is made by drying the skins of corpses and grinding them into powder. It will have a stronger effect if it's made with an old corpse. Tetrarch Vellior told me he uses the skins of the undead for best effect.
I need a favor from you. If you go to the Marshlands southwest of our village, you'll find Zombies of the Tree Elves, long dead after our race wiped them out. Go after them and bring back their Zombie Skins. If you bring me five of them, I will give you a reward.