Barrel Effects: How Cask Types Shape Whisky Flavour
Ask a distiller where a whisky's flavour comes from and plenty of them will point at the wood. Many will say 70% of the total flavour comes from the wood, I think that can only be rough estimate at best. Some distillery character stands out more than others, and I'm not sure I understand trying to say a percentage of all the flavour present comes from a particular thing, especially when flavour is subjective. The totality of what I taste is undoubtedly different from the totality of what you taste.
Having said all that, grain and stills set the starting point. Then the spirit sits in a cask for years, pulling flavour out of the wood and slowly changing. Today I want to walk through the main cask types, what they tend to bring, and how a few of our own bottles show it. Nobody can tell you what you should taste, so treat all of this as a potential guide, not a rulebook.
Start with the wood: American vs European oak
Almost all whisky is aged in oak, but the type of oak changes the result.
American oak has a tight grain and is rich in compounds called lactones. That's where the classic vanilla, coconut, caramel and honey notes come from.
European oak has a more open grain and more tannin. Think clove, nutmeg, dried fruit and a dry, grippy feel on the tongue.
These are generalizations, and a lot depends on how the cask was toasted or charred. Still, if you remember "American is sweet and vanilla, European is spicy and dry," you're ahead of most label readers.
The workhorse: ex-bourbon casks
Bourbon has to be aged in new, charred American oak, and once a barrel has held bourbon it can't be used for bourbon again. So those emptied barrels travel, and a huge share of the world's whisky ends up in them, Canadian included.
A first bourbon fill has already given up its roughest wood tannins, so what's left tends to be gentler: soft sweetness, toffee, vanilla, a bit of fruit. It's a gentle way to age a spirit.
Our own bottles use it too. Our Still Waters Single Malt spent its main maturation in a Wild Turkey ex-bourbon cask before we finished it (more on that below). Macaloney's Triple Distilled started in virgin American oak, then we moved it into an ex-rye, ex-bourbon barrel as our own finishing step. When I taste it, the toffee and caramel make sense to me against that sweet American oak background. That's my read, though. Yours might be different, and that's fine.
Finishing: the short, loud second act
A finish means moving whisky from its first cask into a second one for a final stretch. It's like adding a strong ingredient to a recipe that's already working. A little goes a long way.
Amburana. Amburana is a Brazilian wood, traditionally used to age cachaça, and it brings a lot of spice. Our Still Waters Single Malt Amburana Finish is where we put it to work: cinnamon, baking spices, ginger and cedar, with vanilla underneath. We believe it's the first Canadian whisky finished in a Brazilian Amburana barrel, but I'd rather you taste it than take my word.
Moscatel. Moscatel is a sweet wine made from Muscat grapes. Our Saanich Single Malt was matured in a Moscatel cask and a Canadian whisky barrel, and the bottle leans fruity and floral: peaches, melons, honey and jasmine tea. I won't say the cask did all of that, because the spirit and the second barrel work together. But the sweet, perfumed side of it is what I'd point to Moscatel for.
Rum. Rum casks tend to bring a brown sugar sweetness. Spooney's 1:49th Canadian Blend includes a small part that spent four months in a Jamaican rum barrel, after time in a Kentucky bourbon barrel and a once-used Brazilian Amburana barrel. That part is only 2% of the blend, so it's one thread among several, but it's a fun example of how layered a single bottle can get.
You'll also hear about sherry and port casks all the time. We don't have a release in those right now, so I'll leave them for another post.
Why this matters to an independent bottler
This is the part I enjoy most. When you're not tied to one house style, you can ask a simple question: what would this cask be like with a different second barrel? Sometimes the answer is "gentle and sweet." Sometimes it's a cinnamon hug.
You don't need to name every flavour to enjoy a dram. This article hasn't intended to be a complete list of casks and flavours, but if you learn what a few casks tend to do, a label stops being a puzzle and starts telling you something. That's it. No quiz.
If you want to see how these casks play out in the glass, have a look at the current lineup on the home page.
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Cheers!
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