Clonal Selection — Uniformity and Predictability vs. Diversity

Clonal selection is the viticultural practice of propagating grapevines from a single identified mother plant that exhibits desirable characteristics, whether early ripening, disease resistance, small berry size, or specific aromatic compounds. Each cutting taken from that mother vine is genetically identical to its parent, creating uniformity across a vineyard block. This stands in direct contrast to massal selection (selection massale), the traditional approach in which cuttings are gathered from multiple, diverse vines across an existing vineyard, preserving the natural genetic heterogeneity that accumulated over decades or centuries.

• Clones are numbered and registered by national authorities: the IFV in France (formerly ENTAV) and Foundation Plant Services at UC Davis in California
• Massal selection preserves genetic diversity by taking cuttings from many different parent vines, whereas a single certified clone produces genetically identical plants at scale
• Pinot Noir, one of the oldest cultivated varieties, is recognized as especially prone to somatic mutation, contributing to its remarkable clonal diversity compared to most other varieties

The process begins when a viticulturist or researcher identifies a mother vine with superior, stable performance across multiple growing seasons. Cuttings are taken, propagated in nurseries, and subjected to virus-indexing to confirm they are free of pathogens such as leafroll virus and fanleaf disease. In France, this rigorous process is overseen by the IFV under the Ministry of Agriculture, which certifies and assigns each approved clone a unique accession number. Once certified, clones can be distributed internationally through licensed nurseries, guaranteeing genetic consistency and authentic origin. The Dijon clones, for example, are traceable to specific vineyard sites across the Cote d'Or.

• Virus-indexing and, increasingly, next-generation sequencing confirm that certified plant material is free of the major diseases that compromised post-phylloxera replanting
• Propagation from cutting to vineyard-ready grafted vine typically takes two to three years through commercial nursery channels
• The ENTAV-INRA trademark, now administered by IFV, guarantees traceability from the French conservatory at Espiguette to commercial plantings worldwide

Clonal selection created unprecedented quality consistency and disease-free vineyards, enabling producers to predict ripening windows and manage harvest logistics with confidence. The Dijon clones, initially selected for early ripening in cooler Burgundian vintages, delivered reliable sugar accumulation and aromatic intensity that transformed Pinot Noir production in Oregon and California from the late 1980s onward. However, critics point out that widespread monoculture planting of a handful of clones can flatten regional distinctiveness. Contemporary premium producers increasingly plant complementary clonal combinations within single parcels to recover the natural layering of flavors and structures that older, genetically diverse plantings express.

• Early-ripening Dijon clones (113, 114, 115) shifted Pinot Noir character in Oregon and California toward riper fruit, deeper color, and softer tannin structure
• Heritage selections such as Pommard (UCD 4 and its derivatives) tend toward greater tannin grip, higher acidity, and more earthy, spice-driven profiles
• Dijon clone 667 is prized for aromatic and tannic finesse, while 777 is known for combining finesse with concentration and deep color

Every significant wine region now defines itself partly through its approved or preferred clonal portfolio. Burgundy's Association Technique Viticole de Bourgogne (ATVB) scouts and selects vines across the region for the widest diversity of positive characteristics, grouped into Pinot superieur, Pinot fin, and Pinot tres fin categories. In California, UC Davis Foundation Plant Services built its Pinot Noir collection from imports beginning in the 1940s under Dr. Harold Olmo, with the Pommard selection (UCD 4) dating to a 1951 import from Burgundy. Oregon's Willamette Valley was transformed when Dijon clones 113, 114, 115, 667, and 777 arrived in 1987 and 1988, establishing a new standard for certified Burgundian selections outside France.

• Burgundy: ATVB grouped selections blend traits including sugar accumulation, acidity, color stability, and tannin structure, with no individual clone sold in isolation
• California: Heritage Pommard and Wadenswil selections coexist with Dijon clones; most vineyards plant two to four different clones, though some blocks hold many more
• Oregon: Dijon clones 115, 667, and 777 are the most widely planted; they are blended with heritage Pommard and Wädenswil selections to achieve complexity

Modern genomic analysis confirms that clones within a single variety differ by very small numbers of somatic mutations accumulated over decades or centuries of separate propagation. These minute differences nonetheless correlate with measurable phenotypic variation: differences in ripening date, berry size, cluster architecture, anthocyanin concentration, and aromatic compound profiles. The push toward a narrow selection of high-performing certified clones in the mid-to-late 20th century brought enormous agronomic and commercial benefits, but researchers and producers now recognize that relying on very few genotypes at scale exposes vineyards to uniform vulnerability and can homogenize wine character. Preserving massal plantings and expanding clonal portfolios is increasingly viewed as a strategic response to both quality and climate resilience goals.

• Official French clone research began with Dr. Raymond Bernard at the University of Dijon in the 1950s, gaining Ministry of Agriculture support by the 1960s; the first certified Pinot Noir clones were released in 1971
• Clonal differences manifest most clearly in cool-climate varieties like Pinot Noir and Riesling, where small shifts in ripening timing create pronounced differences in acidity, phenolics, and aromatic profile
• Genetic resources for major French varieties are conserved at INRAE's Domaine de Vassal, which holds approximately 2,700 grape varieties from 54 countries

Leading terroir-focused producers now embrace clonal heterogeneity as a deliberate strategy, planting complementary selections within single vineyard blocks to combine the disease resistance and predictability of certified clones with the aromatic complexity that diversity delivers. Producers such as Ponzi Vineyards in Oregon's Willamette Valley blend over 25 clones within single blocks in a practice they call clonal massale, which combines the principles of both clonal and massal selection. Chateau Lynch-Bages in Bordeaux began a major shift toward massal selection in 2011, taking cuttings from 50-plus-year-old parcels of Cabernet Sauvignon, Merlot, and Petit Verdot to build a genetically diverse replanting bank. Rather than abandoning clonal selection's proven benefits, these producers use it as one tool in a broader strategy.

• Multi-clone planting strategies allow winemakers to harvest different clones at their individual optimal ripeness, creating natural balance between freshness and concentration
• Massal selection preserves site-adapted genetic material that has proven itself over decades, a quality certified commercial clones cannot replicate
• Heritage clonal collections maintained at INRAE, IFV, and UC Davis Foundation Plant Services serve as irreplaceable genetic reserves for future selection work