Times are getting increasingly tough for many of California’s wine grape growers.

Wine-souring smoke from wildfires, grape-shriveling drought and global warming have all been playing an increasingly detrimental role in state vineyards for at least the last decade.

But those aren’t the only headaches. More recently, a tectonic shift in generational drinking habits has led to a global glut of wine.

Now, struggling California growers have found themselves having to compete with bargain-basement wine prices from overseas growers eager to rid themselves of aging supplies.

“What’s aggravating is that we have grapes that…