Assyrtiko
Assyrtiko or Asyrtiko is a white Greek wine grape indigenous to the island of Santorini. Assyrtiko is widely planted in the arid volcanic-ash-rich soil of Santorini and other Aegean islands, such as Paros. It is also found on other scattered re ...
is the island's flagship grape. It's a high acid grape full of citrus and mineral nuances. It can be enjoyed on its own or with grilled fish and meats. The grape is often referred to as a "white grape in red’s clothing," due to the full-bodied wines it produces with an average of 13.5% abv.
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Santorini is immune to
phylloxera
Grape phylloxera is an insect pest of commercial grapevines worldwide, originally native to eastern North America. Grape phylloxera (''Daktulosphaira vitifoliae'' (Fitch 1855) belong to the family Phylloxeridae, within the order Hemiptera, ...
as its volcanic soils contain none of the clay that is necessary for parasite to survive. As a result, many of the roots found on the vines on Santorini are centuries old. The grape growers of Santorini use a unique bush-training system, known as koulara, to grow the grapes. As the vines grow, they are woven into baskets with the grapes facing toward the inside of the ring. The vine's leaves and vine provide protection for the grapes from harsh winds and sunlight. The koulara are often grown haphazardly on small plots of land and can be mistaken for wild bushes by unknowing passers-by. Grape varieties are frequently grown together and the growers are often unaware which grapes are which until harvest which takes place in mid-August.
At the age of 75 a vine is generally woven into many layers and it may be unable to provide proper nutrients and high enough yields to keep in production. As a result, it is clipped at its roots and a new vine is connected to the rootstock. It is important to keep the roots healthy and in use as their old age has allowed them to grow deep into the calcareous soils, extracting any moisture that may be available.

Santorini classified wines: Santorini, Nykteri and Vinsanto (see below for Vinsanto information.)
Santorini: This wine must contain 75% or more of the Assyrtiko grape variety with the remaining 25% made up from Athiri and/or Aidani. The wine is generally unoaked, but some wineries choose to make a small portion of oaked wine due to Assyrtiko's versatility. Either way has a great gaining potential due to the high acidity of the grapes. The wine is bone-dry with high acid toting flavors of lemon and stone fruits with a distinct taste of minerality.
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Nykteri: In Greek, the name means "working the night away" as it was traditionally harvested at night to avoid the hot temperatures and create a fine wine with little extraction from color and exposure to air. The grapes were to be picked before sunrise and
pressed and drawn off within the first day. Today, many producers still choose to harvest the grapes at night, but some also harvest during the day. It is at least 75% Assyrtiko with the remaining composition allowed to derive from Athiri and Aidani. After vinification in steel or oak, Nykteri wines must be aged in oak for a minimum of three months. These wines are bone-dry and contain high acid and mineral components bringing forth flavors of citrus and stone fruits.
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Mezzo: Although this wine is not part of Greece's classification system, it is a wine commonly produced. This is a sweet wine made from the island's white or red grapes and is similar to Vinsanto, but literally means "less sweet." The grapes are also sun dried, but before vinification dry grape must is added to the run-off juice from the raisined grapes.
Vinsanto
Vinsanto is an ancient winemaking tradition of Santorini that dates back thousands of years and represents an important part of Santorini's history.
For a wine to be labeled Vinsanto in Santorini the wine must be predominately made from the Assyrtiko grape—at least 51%, the remaining 49% is made up of Athiri and Aidani and some small amounts of locally grown white varieties. Vinsanto does not undergo any chaptalization and is made up only of the natural sugars and acids of the grapes. Vinsanto is made from late harvested grapes that have been dried in the sun for 12–14 days. They are then crushed and fermented and are then aged for a minimum of 24 months in oak barrels. Vinsanto must achieve a minimum of 9% abv.
Vinsanto is known for its golden-orange to dark amber coloring with a complex bouquet of dried apricots, golden raisins and other dried fruits combined with sweet spice and an underlying minerality. Although it is classified as a dessert wine, the high acid of the Assyrtiko and other indigenous grapes grown on the island balance the sugar content to produce an extremely palatable drink that can be paired with a variety of foods.
The winemaking style of vin santo can also be found throughout Italy and has historically been known as Italy's "Holy Wine" as it was used in the Catholic
Eucharist
The Eucharist (; from Greek , , ), also known as Holy Communion and the Lord's Supper, is a Christian rite that is considered a sacrament in most churches, and as an ordinance in others. According to the New Testament, the rite was institu ...
due to its sweetness.
Another theory relates its origins partially with
Santorini
Santorini ( el, Σαντορίνη, ), officially Thira (Greek: Θήρα ) and classical Greek Thera ( English pronunciation ), is an island in the southern Aegean Sea, about 200 km (120 mi) southeast from the Greek mainland. It is th ...
. Santorini was used as a trading port through much of history, but produced very little goods themselves. Only with the Venetian domination the island focused on the cultivation of wine that would be exported from the island throughout the Mediterranean. Packages taken from the island were labeled "Santo" to denote their origin. Wine from the island was denoted "vin" or "vino" (the Italian word for "wine") to denote the packages contents; thus, the term "Vinsanto" was born.
In 2002, the EU determined that there was enough information to name Santorini, Greece as Vinsanto's place of origin thus granting the island exclusive rights to the use of the name Vinsanto on its sweet wines. Italy may still use vin santo or vino santo to denote its winemaking style. Laying down certain rules for applying Council Regulation as regards the description, designation, presentation and protection of certain wine sector products.
Wine Museum of Santorini

The Wine Museum is established in a cave on the ground of Koutsogiannopoulos Winery
near the village of
Messaria.
References
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Wine
Wine is an alcoholic drink typically made from fermented grapes. Yeast consumes the sugar in the grapes and converts it to ethanol and carbon dioxide, releasing heat in the process. Different varieties of grapes and strains of yeasts are ...
Wine regions of Greece
Greek wine
Grape varieties of Greece