How Rare Is Duff Grenache? (& Hunter Semillon.) A 101 Look at Global Scale...

The story of scale...

If wine had a population census, Blewitt Springs Grenache and Hunter Semillon would be tiny villages in a world of megacities. They’re the kinds of wines that make you slow down: old vines clinging to poor soils, modest yields, and a stubborn devotion to flavour over volume. When we talk about Duff Grenache and classic Hunter Semillon, we’re not talking about “categories” that flood bottle shops - we’re talking about slivers of production that survive because growers and makers insist they should. Read more stubbornness and refusal to let go of "the dream".

Hunter Semillon’s small but mighty footprint...

The Hunter’s entire annual crush is modest by national standards, and Semillon - though stylistically iconic - represents only a slice of that total. Directionally, a third-or-so of the region’s fruit will be Semillon in many seasons, which puts the style firmly in the realm of “specialist” rather than “mass.” For a grape that defines an entire region’s identity - from green-gold, nervy young releases to lanolin-tinged, toasty old beauties, scarcity matters. Each bottle is a thread in a very local tapestry. It's no wonder Robert Parker Jr. consistently lists Hunter Semillon as one of the best kept secrets in the world of wine. But trust me when I say this, Hunter winemakers don't want it kept a secret.

Want numbers? Let's just say that on average around 4500ton (give or take) of grapes are grown in the Hunter every year, ALL varieties. This accounts for ~0.3% of Australia's annual crush. Semillon however comes in, based on averages, at ~0.1% of Australia's annual crush - now wait for it! 

Let's be generous and round up, this accounts for less than 0.005% of all the wine made globally each year!

Side fact, if you could pick every variety and every grape in the Hunter in one day, then trucked it all to the big wineries of inland Australia (which there are a lot) around 5 of these wineries are big enough to crush all of the Hunters fruit in one morning. That's not all 5 together, that's anyone of those 5 wineries on its own, in one morning...

Blewitt Springs: a niche within a niche...

Let's zoom in on McLaren Vale now and then further into Blewitt Springs, and you hit one of Australia’s most cherished pockets for Grenache: higher (the highest sub-region of McLaren Vale), sandier, wind-licked, and late to ripen. McLaren Vale grows plenty of varieties, but Grenache is a minority and the concentration of old, bush-trained vines in Blewitt Springs means you’re effectively looking at a niche within a niche. Precise sub-regional tonnage isn’t published each year, but even generous ballparks put Blewitt Springs’ Grenache at a tiny fraction of national output - small enough that every individual parcel feels consequential. But, given the above Semillon stats, I know you want a breakdown.

Keep in mind, here at Duff Wines, we made 1.3ton in 2024. 

So here goes:

McLaren Vale Grenache in 2024 was recorded at 2,640ton. If Blewitt Springs accounts for roughly 10–20% of the Vale’s Grenache (consistent with its concentration of old-vine Grenache producers), that’s ~260–530ton. Australia’s total 2024 crush was ~1.43 million tonnes.

260–530 ÷ 1,430,000 ≈ 0.02–0.04% of domestic wine produced. 

World scale, this accounts for less than 0.002%...

Put that beside the global heavyweights...

Now change lenses. Champagne ships in the hundreds of millions of bottles annually. I love Champagne, I never will stop loving it - but let's put things into perspective. Even when you focus only on Grand Cru fruit - the pinnacle and very expensive stuff - it’s still a vast pool relative to the Australian fine-wine micro-sites of the Hunter Valley and Blewit Springs. Prosecco dwarfs almost everything, with exports measured in a torrent of bubbles. Provence rosé is its own ocean, with an entire region geared so strongly to pink that most of what it produces is exactly that. Marlborough Sauvignon Blanc is another giant, with tens of thousands of hectares dedicated to a single, ultra-recognisable style.

Grand Cru Champagne (est.): ~40,700ton ~0.12% of world wine.
Prosecco DOC: ~707,000ton ~2.14% of world wine.
Provence rosé (AOP): ~145,000ton ~0.44% of world wine.
Marlborough Sauvignon Blanc (2024): 275,310ton ~0.83% of world wine.

Even the pinnacles of scarcity aren’t as small as you might think until you get to true cult zones. Bordeaux First Growths - household names the world over, still bottle in the tens of thousands of cases combined each year, which is undeniably tiny compared with Champagne or Prosecco but still substantial beside a single Australian sub-region’s old-vine Grenache. At the other extreme sits Burgundy’s Domaine de la Romanée-Conti, the godfather of Australian wines favorite, whose total annual output across Grand Gru vineyards is famously minute - a reminder that, globally, “rare” is a spectrum and context is everything.

Rarity on its own isn’t virtue; it’s just math. But in places like Blewitt Springs and the Hunter, scarcity tends to be tied to very particular soils, aspects, vine ages and winemaking cultures that don’t scale. Old bush vines on deep Maslin Sands don’t become a factory; hand-picked Semillon destined for a decade in bottle doesn’t become a commodity. When you open Duff Grenache, you’re not opening a category - you’re opening a place, a season and a set of decisions that favour expression over volume. When you open an aged Semillon, enjoy it, it's a time capsule from the oldest planted region in Australia, that is home to some of the oldest living vines in the world.

If that sounds romantic, it’s also practical. Small places focus you. They force you to choose vineyards carefully, to pick on feel, to work gently in the winery, and to accept that some years give you less. The trade-off is that the glass in your hand says something few other glasses can.

Let's NOT get into how much each bottle sells for and how much some of those big internationals are earning - let's just say, drink locally and support Australian - there is a lot of value in a bottle of Hunter Semillon and there is a lot of love in a bottle of Duff.