Riesling

The story

The first record of Riesling is an accountant's line: on 13 March 1435 the cellar book of Count Johann IV of Katzenelnbogen at Rüsselsheim logged 22 shillings 'umb seczreben Rießlingen' — Riesling cuttings for the vineyard. The vine itself is older: Ferdinand Regner's DNA work (c. 1998, Klosterneuburg) dates the natural cross to the 13th or 14th century, with Weisser Heunisch (Gouais Blanc) as one parent — VIVC still records the pedigree as '? × Heunisch Weiss', the second parent formally unconfirmed; Regner's hypothesis is an extinct wild-Rhine-vine × Traminer hybrid. From there, Riesling's history is a chain of decisions. In 1720 Schloss Johannisberg planted 294,000 Riesling vines — per Germany's own wine institute, the first vineyard in the world planted exclusively with Riesling. In 1775 the estate's courier returned weeks late with harvest permission from Fulda; the rotting grapes made an unexpectedly great wine — the birth of Spätlese. In 1787 the Elector of Trier ordered the Mosel replanted to Riesling within seven years; today roughly 60% of its ~9,000 ha still is. The 20th century nearly undid it all: Liebfraumilch, once drunk by the British royal family and Charles Dickens, collapsed after WWII into a cheap four-grape blend that often held little actual Riesling, and the 1971 wine law graded wine by sugar ripeness rather than site. The VDP's answer — a private, Burgundy-style vineyard classification built from 1996 to 2012 — exists explicitly to repair that damage; in 2026, German law itself began shifting to the same origin-first logic.

Insider story

Schloss Johannisberg, the world's first all-Riesling vineyard, was a diplomat's perk: in 1816 Austrian Emperor Franz I gifted it to Klemens von Metternich — the Metternich of the Congress of Vienna — and his family kept it until 1992. The famous 1775 'Spätlesereiter', though, is décor: German Wikipedia's own dedicated article on the legendary rider states he is not historically documented, even while the delayed-permission event itself is treated as real. The 1787 edict that made the Mosel a Riesling monoculture is usually told as quality policy; local Mosel histories point instead at the Elector's 10% harvest tithe — Riesling simply yielded more reliably, so the reform paid him. At the top of today's market the theatre is live: when bidding on Egon Müller's 2003 Scharzhofberger TBA hit €12,000 a bottle at the 2015 Trier auction, the winemaker enlarged the lot from 18 to 22 bottles on the spot rather than let the price climb further. And the most sought-after dry Riesling on earth, Weingut Keller's G-Max, is 1,500 bottles a year from a vineyard the family — ten generations on one undivided Rheinhessen parcel since 1789 — refuses to name.

Technical deep dive

The petrol note is chemistry. Grapes make carotenoids as sun protection; post-véraison heat and UV break them into precursors that acid hydrolysis slowly converts, in bottle, into TDN (1,1,6-trimethyl-1,2-dihydronaphthalene — Winterhalter 1991). In 2024 Leibniz-LSB/TU Munich found the specific human receptor, OR8H1 — of 766 olfactory receptor variants screened, the only one responding at wine concentrations (Haag et al., DOI 10.1021/acs.jafc.3c08230). Trained sommeliers detect TDN at 2.3 µg/L, untrained drinkers near 14.7; European Rieslings run 1–50 µg/L, Australian up to 250+. Everything that raises TDN — low yields, late harvest, sun, water stress — also marks quality, which is why petrol develops more in top wines. Levers: keep cluster sun exposure under ~20% from véraison (AWRI), avoid post-véraison leaf removal (Kaiserslautern/Hohenheim research), and mind closures — a 15-year screwcap Riesling tested 200+ µg/L against ~50 under cork. The vine ripens late to very late, buds around 20 April (Geisenheim's model put 2026 four days early; ripening overall has moved 2–3 weeks earlier in 40 years), and per LWG Bayern is 'unproblematic', adapting to nearly all soils — Mosel slate is a stylistic, not agronomic, preference — with steep slopes recommended. Winemaking is subtraction: steel or old neutral Fuder casks, malolactic generally blocked to keep the high acid. Sweet tiers ride noble rot: Botrytis perforates the skins, water evaporates, and the fungus consumes acid faster than sugar while excreting glycerin — hence BA/TBA's unctuous texture (must to ~45% sugar) — needing ~80° Oechsle fruit, morning fog and dry afternoons; on unripe fruit in rain the same fungus is just grey rot.

Industry secrets

Germany's Prädikat ladder (Kabinett → Trockenbeerenauslese) measures must weight at harvest, not sweetness — Kabinett and Spätlese are routinely bone dry. Pfalz/Zone A minimums for Riesling: QbA 60° Oechsle, Kabinett 73°, Spätlese 85°, Auslese 92°, BA 120°, TBA 150° — and Eiswein needs only 120°, the BA level, not TBA's. Eiswein's cold bar is court-tested: −7°C sustained roughly 10–12 hours (OVG Rheinland-Pfalz, 2014), rising to −9/−10°C when 15%+ of the fruit carries botrytis. The prestige tier isn't law at all: VDP Grosses Gewächs (hand harvest, ≤50 hl/ha, ≤9 g/l residual sugar, one GG per vineyard per estate per year) is a private association rulebook born of the 1971 law's failures. Alsace's rules are law, and stricter than commonly quoted — the Grand Cru cahier des charges (read directly) sets 4,500 vines/ha versus the base AOC's 4,000, yields of 55/66/77 hl/ha versus the base 90/96, mandatory hand harvest, an outright irrigation ban, VT at 235 g/L must sugar and SGN at 276 g/L for Riesling, and no release before 1 June of the following year. Austria's Wachau runs its own private Codex: Steinfeder ≤11.5%, Federspiel ≤12.5%, Smaragd ≥12.5% natural alcohol, no enrichment. Read plantings tables warily: OIV Focus 2017 gives Germany 24,000 ha (23.3% of its vineyard), Australia 3,000, China 2,000 — and Romania 6,000 ha that may well be Welschriesling ('Riesling Italico', which is what Romanian usage overwhelmingly means); no other source in four languages names Romania as a Riesling country, so never propagate that row as true Riesling.

For collectors

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