Wizard of Wines Magic Gems

In Curse of Strahd, the secret to the Wizard of Wines success lay in three magical gems created long ago by some now forgotten wizard. Each magic gem acted as a "seed" when buried, allowing healthy grapevines to grow and germinate hale and wonderful tasting grapes. Each one produced a grape used to make each of the drinks produced by the winery. 10 Years prior to the start of CoS, an unknown party took the gem corresponding to their best blend, Champagne du le Stomp, preventing further creation of said champagne. Shortly before the time of the module, the other two of the the magic gems were taken, one by Baba Lysaga and one by evil druids that serve Strahd.

Since then, the seeds have been used to provide life or magical power for a variety of unwholesome purposes:

• Baba Lysaga stole one and embedded it in her Creeping Hut, giving it life.
• Evil druids venerating Strahd placed one inside a wood effigy of Strahd von Zarovich in preparation for a ritual to create a tree blight named Wintersplinter. After the blight animates, the gem becomes its heart..
  

The long missing champagne gem's whereabouts are unknown and left for the Dungeon Master to decide the location of.