At a Buddhist temple on a wooded hillside in Japan, grapes and wine bottles are given as offerings, and the head monk is also the honorary president of a vineyard cooperative.

Officially, it is known as Daizenji, but it has been nicknamed the "grape temple" because of its deep-rooted links to the history of grape production in the country.

Daizenji is in the Yamanashi region, around 100 kilometers west of Tokyo, famous home of Mount Fuji and, more recently, Japan's top wine-making destination.

"At other temples, they offer sake, but here, we offer wine. That's unique in Japan," said Tesshu Inoue, 75, head monk, recounting the mythic origins of his temple to AFP.

In 718 AD, a famous Japanese Buddhist monk and traveler called Gyoki is said to have met the Buddha of medicine, known in Japanese as Yakushi Nyorai, in a dream at the spot where the temple stands today.

In his hand, Nyorai held a bunch of grapes—inspiring Gyoki to found Daizenji and establish the local vineyard culture, teaching Yamanashi residents how to make wine for medicinal purposes.

A different legend claims farmer Kageyu Amemiya was the first to begin the cultivation of grapes in Japan, in the same area but more than 450 years later, in 1186.

DNA analysis has found that koshu—the oldest grape variety grown in the mountainous region—is a hybrid of a vine species originally cultivated in Europe and a wild Chinese vine.

That suggests it may have followed the Silk Road on its way to Japan, the same way Buddhism established itself in Asia.

The website for Yamanashi's "koshu Valley," supported by the local chamber of commerce, suggests seeds or vines from China may have been planted in the grounds of temples and rediscovered by chance much later.

However, it was only in the Meiji era from 1868 to 1912— a period that saw an explosion in interest in the Western world—that wine production started in Japan.

With its fertile soil and long history of grape growing, Yamanashi was the obvious choice for the first vineyards, and even today, Daizenji is surrounded by grapes being grown on pergola structures.

At the altar, grapes and bottles sit as offerings, while a small shrine conceals an antique cherry-wood statue of Yakushi Nyorai with his famous bunch of grapes.

The lacquered sculpture, decorated with gold leaf, is a precious artifact belonging to the temple and is only shown in public every five years.

Daizenji also sells its own grapes and bottles of wine bearing the temple's name.

"Growing grapes, making wine, it's a good deed," Inoue said with a smile.

"It's good karma."