PIWI Wines: The New Frontier of Sustainable Viticulture in Italy and Northern Europe
In recent years, the term PIWI has appeared more and more frequently in discussions among winegrowers, winemakers and wine enthusiasts. For some, these varieties represent the future of sustainable viticulture; for others, they remain a curiosity destined to stay within a niche market.
As often happens, the reality is more complex. PIWI grape varieties are gradually gaining space in European vineyards and today deserve attention not only for their agronomic interest, but also for the winemaking potential they are beginning to demonstrate.
What are PIWI grape varieties?
The term PIWI comes from the German Pilzwiderstandsfähig, meaning “fungus-resistant”.
These are varieties obtained through conventional breeding programmes that have combined the winemaking quality of Vitis vinifera with resistance genes from other vine species.
They are not genetically modified organisms (GMOs), but rather crossings obtained through traditional selection techniques.
The aim is to develop grape varieties that can better tolerate the main fungal diseases of the vine, especially downy mildew and powdery mildew, thereby reducing the need for plant protection treatments.
Resistance does not mean immunity
One of the most common mistakes when talking about PIWI varieties is to consider them completely immune to disease.
In reality, these grape varieties possess resistance genes that make it possible to significantly reduce the number of treatments against downy mildew and powdery mildew, but they do not completely eliminate the risk of infection.
In years that are particularly favourable to the development of disease, or in the presence of high infection pressure, symptoms may still appear and protective interventions may still be necessary.
PIWI varieties should therefore not be considered vineyards that require no treatments at all, but rather a tool that makes it possible to significantly reduce the use of plant protection products, with economic, environmental and organisational advantages.
Northern Europe was the first to believe in PIWI varieties
The spread of resistant grape varieties has been particularly rapid in Northern European countries.
Germany, Switzerland, Austria and, more recently, the United Kingdom have been investing in these varieties for several decades. The frequent rainfall and high humidity that characterise many winegrowing areas of Northern Europe make the control of downy mildew and powdery mildew particularly difficult.
In these conditions, genetic resistance represents a concrete advantage.
Grape varieties such as Solaris, Muscaris, Cabernet Blanc, Souvignier Gris and Regent are now present in numerous wineries and are used to produce commercially established wines.
Italy is proceeding more cautiously
In Italy, the spread of PIWI varieties has been slower.
The country’s strong winemaking tradition, its connection with historic grape varieties and the regulatory limitations that affected these varieties for years have all contributed to slowing their expansion.
In recent years, however, the situation has begun to change.
The regions of Northern Italy, especially Trentino-Alto Adige, Veneto and Friuli Venezia Giulia, have become the main centres of experimentation and development for these grape varieties.
Many wineries are evaluating PIWI varieties as a possible response to the market’s growing demand for sustainability and to the increasing difficulties involved in vineyard disease management.
Despite this, their weight within the Italian winegrowing landscape remains limited compared with traditional varieties.
Solaris: the PIWI variety that has convinced the market
Among the PIWI grape varieties currently grown in Italy, Solaris is probably the one that has achieved the most convincing results from both an agronomic and winemaking perspective.
The variety stands out for its high resistance to the main fungal diseases, its good productivity and its ability to reach satisfactory ripeness even in areas characterised by relatively cool seasons.
From a winemaking point of view, Solaris has shown that it can produce wines of interesting quality, with good aromatic structure and excellent balance.
Particularly significant is the success achieved by some sparkling wines produced using the ancestral method, which have helped improve the perception of resistant grape varieties among wine enthusiasts and industry professionals.
Today, Solaris probably represents the best example of how a PIWI grape variety can find its own commercial identity without being perceived simply as an “ecological” alternative to traditional varieties.
The quality of PIWI wines
For a long time, the main limitation of PIWI varieties was the quality of the wines they produced.
The first generations of resistant grape varieties often produced wines with aromatic characteristics considered less appealing to European consumers.
The situation has changed radically in recent decades.
Modern varieties have a very high percentage of Vitis vinifera genetic heritage and make it possible to obtain wines of higher quality than in the past.
Today, numerous PIWI wines receive recognition in international competitions and demonstrate that disease resistance is not necessarily incompatible with winemaking quality.
Naturally, the comparison with iconic varieties such as Chardonnay, Riesling, Sauvignon Blanc, Pinot Noir or Cabernet Sauvignon remains open and represents one of the main challenges for the sector.
What future for PIWI varieties?
It is unlikely that PIWI grape varieties will replace the great historic European varieties in the short term.
However, the growing attention to environmental sustainability, the reduction of plant protection products and adaptation to climate change could encourage their wider spread.
Northern Europe is currently the most advanced laboratory for these varieties, while Italy is watching with interest and continues to build experience, especially in its northern regions.
For the world of wine, PIWI varieties are no longer just an experiment. They are a concrete reality seeking their place within a viticulture increasingly oriented towards sustainability and quality.
It remains to be seen whether, in the coming decades, they will be remembered as a technical niche or as one of the most important innovations in contemporary European viticulture.
