Grown, Made, Aged and Bottled Here. Our Wine Never Leaves the Estate.

Twenty-two vintages in, we did something here at Marananga we had wanted to do for a long time. In March 2026, in the middle of vintage, we put in our own bottling line.

On paper it reads like a piece of plumbing. It isn’t. It closed the last gap in the chain.

From the 2026 vintage, every Tscharke wine is grown, produced, aged and bottled inside the same few hundred metres of the Barossa Valley. Fruit is hand picked off our blocks on the Western Ridge, fermented here, aged in The Underground beneath our feet, and filled into glass here. Nothing goes on a truck until it is a finished bottle with a label on it.

What “estate grown, produced, aged and bottled” actually means

Estate grown, produced, aged and bottled means one producer owns or controls the vineyard, makes the wine, matures it and fills it into bottle on the same property, with the wine never leaving that site in between.

In the United States, “estate bottled” is a regulated term. A winery can only use it if it owns or controls all of the fruit and crushes, ferments, finishes, ages and bottles the wine in the one place, inside the same viticultural area.

Australia has no equivalent rule. Nobody here regulates the word estate, which is exactly why it is worth spelling out rather than leaving you to take it on trust.

So rather than lean on a definition, we lean on certification. We are certified organic, biodynamic and regenerative, which means the way we farm and the way we make wine is audited by somebody other than us.

Here is the chain, spelled out.

• GrownOur own vineyards at Stone Well, Gnadenfrei and Greenock Creek. Certified organic, biodynamic and regenerative.
• ProducedHand picked, wild fermented in small open fermenters, in our wine shed.
• AgedSome in the winery. The rest in The Underground, five metres below the estate, sitting at 13 to 15°C all year without an air conditioner.
• BottledUsing our own bottling line, installed March 2026, metres from the tank.
• Stored & shippedFrom here.

The vessels

Not all of it goes underground. Some stays up in the winery. The rest goes down into The Underground, into rows of vessels running the length of the hall.

Four kinds, and plenty of each.

• FoudreLarge-format oak. Slow, even, and gentle on the fruit, because the ratio of wine to wood is so much higher than in a small barrel.
• TerracottaClay. A vessel form roughly eight thousand years old, and the only one here chosen for what it does not do. It adds nothing.
• Concrete eggNo flavour, no straight edges. The shape keeps the wine quietly moving on its own.
• HogsheadSeasoned oak barrels, for the parcels that want a little more shape.

That is the élevage: the raising of a wine between ferment and bottle. It is where a vintage becomes a wine. And in every one of them, the wine is filled, aged and emptied in place. Nothing gets shifted to suit a schedule.

One property. One team. One continuous process.

Seventeen kilometres

That is how far our wine used to travel to be bottled. Six small truckloads a year, seventeen kilometres each way.

It was never a long trip. That is exactly the point.

Even a run that short meant pumping finished wine out of the tank into a tanker, driving it, pumping it into another tank, running it through a line, palletising it and trucking it home again. Four or five handovers before a closure went on, and a bottling date locked in months ahead.

The distance was never the problem. The handling was.

Why moving wine is never neutral

Wine does not have to be spilled to be damaged. It only has to meet air.

Winemakers measure this at bottling as total package oxygen: the oxygen dissolved in the wine plus the oxygen trapped in the headspace under the closure. The Australian Wine Research Institute puts best practice below 1.5 mg/L. Between 1.5 and 2.5 mg/L is acceptable. Above 3 mg/L needs improvement, and above 4 mg/L is poor practice.

Here is the part that matters. A single milligram per litre of oxygen can cost a wine up to four milligrams per litre of free sulphur dioxide. That is the preservative doing the protecting, and it is spent in the first few months in bottle, long before anyone opens it.

Which is why the number matters more to us than to most. Organic certification caps the sulphur we can use at roughly half what a conventional winery is allowed. Less preservative means less margin for error. Every milligram of oxygen we do not pick up is worth more to a wine like ours than it is to one that can simply be topped up.

Then there is heat. Research on transport conditions has recorded daily temperature extremes as high as 57°C inside land transport. Wine expands and contracts roughly 0.3 mL for every degree, and that breathing motion draws air in past the closure. Sustained exposure above 25°C does permanent damage, stripping fresh fruit aromatics and pushing a wine toward cooked and oxidised characters. A tanker sitting in the sun on a Barossa summer afternoon is not a hypothetical.

Every surface it touches

There is one more risk, and for a winery like ours it is the one that matters most.

Wine that leaves the winery meets surfaces that are not ours. A hose, the inside of a tanker, a holding tank, a filler head, a line that ran something else last week. Every one of them is another surface where an organism can be waiting.

This is not a criticism of anybody. Sanitation in this industry is taken seriously, and the precautions are genuine and thorough. But a precaution manages a risk. It does not remove it. The only way to remove it is to not introduce the surface in the first place.

That matters more for wine made the way ours is. Certified organic and biodynamic means working with less sulphur, and less sulphur means less of a safety net against spoilage organisms. So the fewer unfamiliar surfaces our wine meets, the safer it is.

Every surface our wine touches now is one we cleaned ourselves.

The two numbers we watch at bottling

We run critical bottling analyses on site now. Two of them decide whether a wine is ready to fill.

Dissolved oxygen is the one above. It needs to be low and it needs to stay low, right through the run.

Dissolved carbon dioxide is the one most people have never heard of, and the window is narrower than you would think. Every still wine carries a small amount of it. The AWRI puts white table wines between 0.8 and 1.3 g/L: below that a wine reads flat, above it, spritzy. Reds sit under 0.5 g/L, because excess carbon dioxide hardens the palate, lifting perceived acidity, tannin and bitterness while pulling down perceived sweetness.

Moving wine changes that number. Every pump, every transfer, every fall into a tanker strips some of it out. So a wine that left the tank in specification can arrive at a bottling line outside it, and taste harder, or flatter, than the wine the winemaker signed off.

Any movement of wine can alter both. So both get watched, continuously, before and right through bottling.

When the lab is metres from the filler, a reading that drifts is something you fix that morning. Not something you find out about in a courier’s report three days later, with the wine already in glass.

Twelve hundred bottles an hour

Industry sizing guides put an entry-level commercial line at 2,500 to 3,000 bottles an hour. An industrial one runs to 15,000.

Ours does 1,200.

That is not a shortcoming we are dressing up. It is the whole idea. Slower means lower pressure, gentler filling, less turbulence, and a line small enough that a person can stop it.

The part a lab report will not show you

Bottling at speed is a sterile process by design, and it should be. Thousands of bottles an hour, nobody’s name on any of them.

Here, the people filling the bottles are the people who pruned the vines. They know which block the fruit came from and what the season was like. Our team genuinely loves bottling week, which is not a sentence many wineries can write honestly.

We hold space for every bottle that leaves here.

Sixth generation on this dirt, seventh growing up in the vines. That is not something you can outsource.

What it means in the glass

We are not going to tell you that you would pick it blind at twenty paces. What we will tell you is this: the wine in the bottle is now as close as we can get it to the wine in the tank.

Fresher fruit. More consistency from bottle to bottle. More sulphur left in reserve to carry the wine, which matters for anything you intend to lay down.

Grown here. Made here. Aged here. Bottled here. It never leaves.

Common questions