In Curse Of Strahd, the Wizard of Wines finally lost the green stone to a raid of Blights and hill-folk Druids. Though the group intended to steal the stone to create Wintersplinter, via an effigy of Strahd, their attack was successful enough to allow them to occupy the Wizard of Wines. This only lasted a short while, however, as the Pack invaded the winery, rooted out the druids and blights, then traveled to Yester Hill. There, they defeated Wintersplinter and returned the green gemstone, allowing grapes to grow again.
An extremely important location to the people of Barovia, the Wizard of Vines was the only source of wine in the valley, a resource that many depended on. It was run by the Martikov family for generations, who produced the wine, as well as glass-blowing and label making technology. As one of the few pillars of Human life in the valley, the winery was constantly under threat from actors against civilization, particularly from the forest-folk of Yester Hill as well as Scarecrows sent from Berez.
The winery delivered to Krezk, Vallaki, and the Village of Barovia prior to the construction of Castle Ravenloft; wine was sent to the castle for a time, and also to the Vistani Camp west of Vallaki. After the Wedding That Never Was, these deliveries became not only a business venture, but also an excuse for scouting. The Martikovs had secretly formed the Keepers of the Feather, a Wereraven spy organization dedicated to understanding the goings-on of the valley.
The Wizard of Wines was able to grow warm-weather grapes in Barovia's cursed soil due to the existence of three magic Gemstones of Life Growth: one green, one grey, and one blue. It was rumored that these stones were gifted to the winery by the Ladies Three in the times before Strahd von Zarovich ruled the land, and allowed them to produce wines of three different grades: "Purple Grapemash #7", "Red Dragon Crush", and "Champagne du la Stomp."
The blue gemstone was stolen from the winery by Baba Lysaga in the year 725 of the Barovian Calendar, as Urwin Martikov was absent to defend the lands. This led to a rift between him and the patriarch Davian Martikov, causing him to leave and establish another Keepers base in the Blue Water Inn. A decade later, Strahd would secretly steal the grey gemstone in use of the construction of the Heart of Sorrow, though the Martikovs knew not how it was taken.
The soil was diminished, now only producing inferior wine, and the winery could only send out Purple Grapemash to the denizens of Barovia.