Cask choice is one of the biggest flavour decisions a distiller makes. Four levers matter most.
1. Oak species
American oak tends toward vanilla and coconut; European oak toward spice and tannin. Australian oak is an emerging option with its own character.
2. Char / toast level
Heavier char filters and adds smoky, caramelised notes; lighter toast is gentler. Match to your target style.
3. Size
Smaller casks (quarter casks) mature faster due to higher wood-to-spirit ratio; larger casks (hogsheads, puncheons) are slower and subtler. See cask types and sizes.
4. Previous contents
Ex-bourbon, sherry, port and wine casks each leave their mark — a major flavour lever.
Track your choices
Record species, char, size, fill number and previous contents on each cask profile so you can learn what works and repeat it. Also see first-fill vs refill.
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