Please welcome Washington, D.C. Member Ambassador Mike Seibert to this month’s edition of Society Life. Mike and I go back about a decade now when we were both learning from one of the great cask strength single malt masters, Mr. Harvey Fry, at one of the great whisky bars in the world, Jack Rose Dining Saloon. He and Mike Hom were among the very first member ambassadors in the country and continue to bring excellent quality events to the good members of the greater DC area.
Mike is the best kind of whisky nerd. His attention to detail is matched only by his passion to share knowledge with others. So, I couldn’t help but I ask him if he might give all of us a proper primer on peat ahead of our all-peat treat of a November Outturn. In lieu of Society Life’s usual format, I am happy to present the fruits of Mike’s labor complete with an original poem paying homage to that earthen brick of beauty.
Pour something smoky for yourself and enjoy the sweet stylings of Mr. Mike Seibert!
Ghost in the Glass
O to the source of flavor supreme,
Patiently slumbering under sun and rain,
Robed in earthy splendor, inch by inch,
Taking the depth and spray of highland, coast, sea, and isle.
O the brine-soaked shroud and inky depths,
Or sweet oaky ash to warm the night,
You rise in reek, a pale white cloud,
A ghostly whisper of secrets hid, etched on barley’s face.
O child of bog, moss, and moor,
You live once more in lifted glass,
A thousand years reborn,
A taste of time evermore.
Peat and Friends
Few ingredients spark as much debate as peat. To me, it evokes fireside evenings with friends, the sea spray while walking along the shore, and the simple joy of being outdoors—all conveniently poured into my glass. To others, it tastes like burning rubber, iodine, liquid ash, or perhaps a barnyard.
I experienced my first peated whisky when, walking into a local whisky bar, SMWS partner bar Jack Rose Dining Saloon, I told the wizened gentleman helping me, “I don’t like peat.” He gave a rather mischievous smile, responded, “Oh, really?” and returned with three snifters. The alluring drams Harvey Fry provided started me on a lifelong journey with some of the most wonderful people and closest friends I have ever had the honor of spending time with, exploring the depth, complexity, and nuance of peat. That was almost 15 years ago, and those first pours—Port Charlotte PC6, PC7, and PC8—are still some of my favorite whiskies.
Like a gateway drug, Port Charlotte led to Lagavulin, Octomore, Ardbeg, Kilchoman, and beyond. Each is a distinct world of flavor, which left me wondering: why do these peated whiskies from the same region taste so remarkably different?
What Is Peat? Formation, Sources, and Chemistry
Few ingredients possess the polarizing power, cultural resonance, and scientific complexity of peat. Understanding peat in Scotch whisky requires looking beyond the dram to explore its ancient biological origins and terroir, the mechanics of smoke absorption, the chemistry of distillation, and the effects of aging.
Geological and Biological Origins
Peat is a carbon-dense organic material formed through the slow decomposition of vegetation in waterlogged, anaerobic (oxygen-poor) environments known as bogs, mires, or moors. Under normal atmospheric conditions, fallen leaves, mosses, and wood are swiftly broken down by aerobic soil microorganisms, returning their carbon to the atmosphere. However, in saturated wetlands, standing water starves soil microbes of oxygen, drastically suppressing decay.
Covering approximately 23% of Scotland’s total land area, peatlands form an indelible feature of the Scottish Highlands and islands. Although intrinsically linked with Scotch production, peat bogs also exist extensively across Ireland, Canada, the United States, Scandinavia, Russia, and northern Europe.
The retirement or minimal production of distillery malting floors means the local moor is unlikely to be the primary peat source for most distilleries—Highland Park’s use of Hobbister Moor being the most prominent exception. Interestingly, Springbank reportedly now uses Highland and Speyside peat instead of a Campbeltown peat source. The rise of large drum malting facilities centralized peat extraction sites to places like Castlehill Moss on Islay, St. Fergus in Speyside, and the Flow Country in the northern Highlands. While each region retains common characteristics, exceptions abound: Bruichladdich uses Highland peat from Aberdeenshire, while Tobermory uses Islay peat via the Port Ellen maltings.
- Islay (Maritime & Medicinal): Island bogs on Islay (such as Castlehill Moss) are densely packed with decomposed sphagnum moss, marine kelp, and centuries of salt spray from Atlantic gales. Burning Islay peat yields heavy cresol and phenol concentrations, resulting in trademark iodine, bandage, salted fish, seaweed, and ocean brine characteristics.
- Highlands & Speyside (Woody & Earthy): Inland mainland bogs accumulated significant arboreal matter—fallen oak, birch, pine, ferns, and terrestrial grasses. Mainland peat smoke (sourced from bogs like St. Fergus in Aberdeenshire) is rich in guaiacols, producing dry bonfire ash, fallen leaves, campfire woodsmoke, and forest-floor earthiness.
- Orkney (Floral & Heathery): On the northern Orkney archipelago, fierce island winds historically prevented tree growth. Bogs like Hobbister Moor (used by Highland Park) consist almost entirely of root-dense heather moss and dwarf shrubs. When burned, Orkney peat releases sweet, aromatic, floral smoke reminiscent of heather honey and dried herbs rather than harsh iodine.
SMWSA partner distilleries also use non-Scottish peat in their production. Seattle-based Westland sources Washington State peat, and Sweden’s Mackmyra sources peat just 25 miles from the distillery.
Peat Reek: Organic Chemistry for Whisky Nerds
The flavors imparted by peat come from an array of chemical components depending on the specific plants that make up the peat bog. When dried peat sods are smoldered in a distillery kiln, they release a thick white smoke traditionally known as "peat reek." This smoke is rich in volatile organic compounds belonging to the phenol family. When wet, germinating barley is exposed to peat reek, these phenolic compounds coat the outer husks of the grains.
The specific phenolic sub-classes deposited during kilning dictate the sensory characteristics of the final spirit:
- Cresol (C7H8O): Delivers classic hospital, bandage, medicinal, and antiseptic notes.
- Guaiacol (C7H8O2): Delivers sweet woodsmoke, savory campfire, and roasted aromas, providing the rich, warm woodsmoke spine of peated whiskies.
- Phenol (C6H5OH): Delivers clean, sharp, disinfectant, and iodine-like medicinal aromas.
- Syringols (C8H10O3): Deliver sweet, mild, vanilla-like, and aromatic smoke qualities.
- Xylenols (C8H10O): Deliver dry, earthy, leathery, and fallen-leaf tones.
A note on peat levels and sensory perception: Peat intensity during processing is conventionally measured in Parts Per Million (PPM) of total phenols present on the malted barley immediately after kilning. However, phenol levels drop steadily through mashing, fermentation, copper contact and reflux during distillation, spirit cut points, and wood interaction and oxidation during aging. While peat-derived smoke compounds come almost exclusively from kilning, additional phenolic compounds are contributed by oak maturation (such as wood guaiacols and syringols) and trace phenols from yeast metabolism. Factor in individual human biology and subjective experience, and the final peaty profile in your glass is defined by far more than a simple PPM number on a bottle.
Conclusion
Whisky is a fascinating study of history, culture, agriculture, chemistry, xylology (wood science), and economics. This study is best undertaken with friends and fellow travelers in the pursuit of knowledge.
I encourage you to engage with your local whisky community: come out to a Society tasting event, log onto the SMWS America Discord channel to chat with fellow members, or pop into your local whisky specialist. Share your knowledge and thoughts and listen actively and courteously to others. You might just find a new whisky to love—and a new friend to share it with.
I look forward to seeing you at the bar or across the table soon.
Slàinte mhath!
P.S. If you are interested in reading more, there are multiple print and online resources across the whisky industry—from online educational guides by The Whisky Shop, Master of Malt, and Alcohol Please HK to philosophical investigations in Bruichladdich’s The Peat Essays and industry-wide environmental audits published by Dramface and Blind Barrels. The conglomerates can keep their secrets, but we can discover together.
Many thanks, Mike, for your musings and meticulous research. And thank you, reader, for spending time with us.
