Every winemaker will tell you the same thing: wine starts with water. Not just rain and irrigation, but the whole relationship between a vine’s roots and the moisture in the soil beneath them. Too little water and the vines shut down, struggling to ripen fruit. Too much, and the vines can drown, rot, or fall prey to disease. At Katy Moore Wines, we think about water constantly — because getting it right, vintage after vintage, is what separates a good wine from a forgettable one.

The Delicate Water Balance a Vine Needs
Grapevines are, in a way, built for a little hardship. Mild, well-timed water stress in the growing season actually improves fruit quality — it pushes roots deeper, concentrates flavor, and signals the vine to put energy into grapes rather than leaves. This is part of why so many great wine regions sit on well-drained soils: gravel, limestone, sandy loam. Vines don’t want wet feet.

But there’s a limit. When soil stays saturated for too long, roots are starved of oxygen. Vines become vulnerable to fungal disease, especially mildew, which thrives in damp, humid conditions. In the worst cases, prolonged flooding can stress a vine so severely that it dies. Drainage, then, isn’t a minor detail of vineyard design — it’s foundational. Most established vineyards run underground drainage pipes beneath the rows, channeling excess water out to roadside ditches so the root zone never sits in standing water for long.

That system works well under normal conditions. It’s the extreme, sudden downpours — the kind climate change is making more common — that push it past its limits.

What Just Happened in Niagara
Ontario’s Niagara wine region got a brutal demonstration of this in the last two weeks. A series of intense storms dumped extraordinary volumes of rain on Niagara-on-the-Lake and St. Catharines. In one overnight event alone, the area around Virgil received roughly 146 millimetres of rain in just five hours, overwhelming drainage systems that were already strained from earlier storms and high water tables.

The damage was widespread. Vineyards along Niagara Stone Road disappeared under standing water. At Zabek Vineyards, owner James Zabek described conditions his own father — who has farmed there for decades — had never seen before. The vineyard’s underground drainage pipes, designed to carry water out to the ditches, simply had nowhere to send it once those ditches filled up too. Crews spent days pumping water off the land by hand. Zabek estimated it would take up to three weeks just to get operations back to normal, assuming no more heavy rain arrived in the meantime.

Not every vineyard fared the same. Hidden Bench Estate Winery, situated on a slope along the Niagara Escarpment, saw three to four feet of water pool in low-lying sections — but its elevation and natural grade helped the water clear faster than it did on flatter ground. It’s a reminder that site selection, something winemakers obsess over for reasons of sun exposure and soil, also matters enormously for how a vineyard handles extreme weather.

The region has since declared a state of emergency, and Ontario’s government is assessing the flooding against its disaster recovery program criteria.

What This Means for the Vines
The immediate concern for growers isn’t just the standing water itself — it’s what comes after. Saturated soil raises the risk of downy and powdery mildew taking hold in the canopy, a threat that can spread quickly in humid, still air. Growers are watching their vines closely in the coming weeks, looking for early signs of disease and adjusting spray programs accordingly.

There’s also a longer-term question for the root systems. Vines that sat in oxygen-starved, waterlogged soil for days can suffer stress that shows up later in the season — smaller berries, uneven ripening, or vines that simply can’t support the same fruit load they normally would. In the most severely affected low-lying plots, some vines may not fully recover, and growers won’t know the full extent of the damage until harvest, or even next spring’s bud break.

For a wine region, an event like this isn’t just a bad week. It can shape the character of a vintage — lower yields, more selective picking, and winemakers working harder to coax quality out of a stressed crop.

Why We’re Watching This Closely
At Katy Moore Wines, we select wines for our private clients and represent international wineries here in Ontario, and stories like Niagara’s are exactly why we pay such close attention to what’s happening on the ground in the regions we work with. A vineyard is not a factory — it’s a living system, at the mercy of soil, slope, and sky. When a growing season is hit by something like this, it can shape the character of an entire vintage, and it’s part of our job to understand that story before it ever reaches a bottle we’d put in front of a client.

We’ll be following how this year’s Niagara vintage develops in the months ahead, and what it means for the wines that eventually come out of this harvest.

Our thoughts are with the growers and vineyard workers across Niagara as they recover. It’s a good moment to raise a glass to the resilience it takes to farm grapes — and to remember that every bottle carries the story of the water, and the weather, that shaped it.