I was on the Bench yesterday for meetings and, as is usually the case, I learned a little more about how wine is made. Typically when you're laying out grapevines you want to align them for sun exposure. In hotter regions, you might align them east-west to minimize the harsh afternoon son. And in cooler climates, like Niagara or Burgundy, you might align them north-south to try and maximize sun exposure.
But what I learned is that topography often takes priority over sun exposure — especially in cooler regions. In practice, this means you generally want to align the grapevines so that they follow the slope of the land. Why? Because cold air is heavier than warm air. Aligning with the slope allows cold air to naturally drain away, which helps the vines survive the winter and reduces the risk of things like spring frost.
If, instead, you aligned the vineyard rows across the slope (as opposed to up and down), well then cold air might get trapped. The same is true for water drainage. I'm told you don't want pooling. And this is why it tends to be more important to optimize for topography rather than just sun exposure, though I'm sure it gets a lot more nuanced when you really know what you're doing.
Regardless, I find all of this fascinating because it's an intensely local activity. You need to understand how the sun moves across the site. You need to understand the site contours and where air and water will flow. And then you need to optimize for these specific conditions. It's exactly how architecture used to work before we had active mechanical systems, like AC, that could do all of the work for us.
