Nagi

Holds a degree in Viticulture and Enology from Geisenheim University in Germany. Served as Head Winemaker at a German winery. Experienced viticulturist and enologist. Currently working as an independent winemaker and consultant specializing in both viticulture and enology.

oenology

2026/4/19

Winemaking Technique | What Is Cold Maceration?

Maceration is a winemaking technique with a surprisingly thin body of precise, publicly available information despite its widespread use. This article takes cold maceration (cold soak) as its central case and examines both the commonly cited benefits and …

qualitycontrol

2026/4/3

The Diversity of Brett Reception | Beyond the Defect-vs-Character

How do you react when Brett comes up in a conversation about wine? Some may wonder why bread appears in the discussion — the resemblance goes no further than the sound of the word. What drifts from the glass is a distinctive smell rarely encountered in ev …

oenology

2026/3/19

Are Dessert Wines Never Red?

Preferences in wine vary widely, but few people seem to dislike the profound sweetness that characterises dessert wines. Even setting aside Château d’Yquem, the mere thought of a Riesling Trockenbeerenauslese from an exceptional vintage is enough to bring …

fermentation

2026/2/12

A Technique for Controlling Spontaneous Fermentation in Winemaking: Pied de Cuve

When making one’s own wine, few producers have never hesitated over the choice of whether to ferment with active dry yeast or to rely on indigenous microorganisms—so-called “wild” yeasts—present on grapes and in the winery. If the priority is fermentation …

viticultur

2026/1/14

Pruning Wine Grapevines: Sap Flow and Longevity Through the Lens of Fundamentals and History

Pruning is one of the most critical operations carried out in vineyards. In viticulture, pruning refers to removing unnecessary shoots and canes that have grown over the season, leaving only those required for the coming production cycle. This work is per …

oenology wine

2025/12/22

Wine and Barrel-Derived Extracts: Phenolic Compounds and Oak-Related Aromas

This article focuses on the compounds extracted from wooden barrels during wine aging and their effects on wine. Discussions of barrel aging are often reduced to the notion of “oak aroma,” with an emphasis on aromatic attributes alone. In practice, howeve …

thorough-explanation

2025/12/11

Myths and Realities of Whole-Cluster Fermentation: How Grape Stems Affect Wine

In the context of winemaking, you may have encountered terms such as “destemming” and “whole-cluster fermentation.” Both refer to how grape bunches are handled at the point of vatting. A grape cluster consists of many berries attached to a green, stem-lik …

oenology thorough-explanation vinnatural

2025/12/10

Bio and “Natural”: A Winemaker’s View from the Cellar

Whenever I occasionally post about “natural wine” on X (formerly Twitter), those posts tend to be shared relatively widely for my account size. This simply indicates how many people react to this particular keyword. In recent years, especially in Japan, t …

qualitycontrol

2025/12/8

The Relationship Between Fill Level and Wine Quality: What the Headspace Reveals

In the context of mature wines—those that have spent a decade or several decades in bottle—the fill level is often used as a quality indicator. Some importers and professional merchants routinely assess fill height and decline to ship bottles that fall be …

qualitycontrol

2025/12/5

Wine Flavour and Glycerol

Wine exhibits remarkable diversity in both flavour and aroma. Even wines produced in the same region during the same vintage never show completely identical sensory profiles. Moreover, when a single producer vinifies grapes from the same vineyard under id …