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THE COMPLETE GUIDE TO FIREWEED TEA: PART 3

How to Process Fireweed Tea:
Sustainable Harvesting and Oxidation

How to Process Fireweed Tea: Sustainable Harvesting and Oxidation

In Part 3 of the Complete Guide to Fireweed Tea, learn how centuries-old Asian and Russian tea processing methods turn a mild Nordic wildflower into a surprisingly complex, flavourful tea. Discover how our sustainable wild harvesting practices leave boreal ecosystems undisturbed. Follow us inside our Quebec factory to see how we process fireweed leaves step by step into Canada’s first loose leaf fireweed black tea through the alchemy and science of oxidation.

Sustainable Wild-harvesting: Our Commitment to the Land

Our Harvesting Philosophy

At Tea of the North, our tea begins with how we treat the land. As we explored in Part 1, fireweed’s extraordinary seed production and extensive rhizome network make it uniquely resilient and well-suited to sustainable harvesting.

Our commitment to sustainable wildcrafting maintains a respectful relationship with the land and delicate ecosystems we depend upon. Every decision is guided by the principle that our tea production should not damage the natural environment.

Fireweed harvesting, Barraute, Abitibi, Quebec
Fireweed harvesting, Barraute, Abitibi, Quebec

Fireweed harvesting, Barraute, Abitibi, Quebec

Quebec Terroir: Abitibi

Our fireweed grows wild in the Abitibi region, approximately 600 kilometres north of Montreal and at the same latitude as Timmins in Ontario. The northern climate creates a short but intense growing season. Long summer days provide extended sunlight hours, while cooler nights slow growth and concentrate essential oils and beneficial compounds. Far from industrial pollution and agricultural chemicals, it means our fireweed grows in a natural environment. The presence of abandoned agricultural fields, wild meadows, forest cuttings and wildfires create conditions where our pioneer fireweed can grow abundantly.

Abitibi is renowned for its vast open landscapes: forests, lakes, and wetlands.
Abitibi is renowned for its vast open landscapes: forests, lakes, and wetlands.

Locating and Protecting Wild Populations

New sites are identified through ground scouting, wildfire and vegetation mapping, friend recommendations, and aerial scouting, allowing us to locate thriving fireweed populations efficiently.

Before any harvesting begins, we evaluate colony size, density, and vigour. Only large, robust, thriving populations with clear indicators of successful reproduction qualify, for sustainability and efficiency purposes. We avoid sensitive ecological areas, wetlands, roadsides, electrical lines and potentially polluted sites.

We maintain detailed records of every harvesting location, including GPS coordinates, population assessments, harvest quantities, and recovery observations. We harvest mostly on public lands, but always ask permission when on private property. Most landowners don’t know fireweed by name; they typically call it the ‘pink flower.’ They’re often surprised and delighted to learn it can be made into tea, let alone that an entire business is built around it. They’re happy to grant us access, and we thank them with a gift of fireweed tea.

Ground scouting in a fireweed patch
Ground scouting in a fireweed patch
Aerial scouting conducted in July 2025 during fireweed blooming
Aerial scouting conducted in July 2025 during fireweed blooming

Harvest Techniques: The Leaf Only Approach

Harvesting fireweed leaves
Harvesting fireweed leaves
Harvesting fireweed leaves
Harvesting fireweed leaves
Harvesting fireweed leaves

Our harvesters work in small coordinated teams, moving through approved harvesting areas supervised by the team leader. Each person carries collection buckets or bags and follows trained protocols taught by our veteran pickers.

Plant Integrity: We carefully harvest the leaves by hand, keeping the stems standing. We take approximately three-quarters of the leaves from each plant, leaving the rest to continue photosynthesis and fuel root system maintenance for next year’s growth. By not breaking the stem, we allow the plant to bloom, which pollinator insects are thankful for and then set seeds, completing its life cycle. We minimize our pathways, thus reducing collateral damage to plants trampled under our feet while moving through dense thickets.

While one hand holds the top of the stem without breaking it, the other strips the leaf downward.
While one hand holds the top of the stem without breaking it, the other strips the leaf downward.

Fireweed harvesting, Barraute, Abitibi, Quebec

Selective Eye: Harvesters actively evaluate each plant’s condition, skipping any showing signs of stress, disease, or insect damage. Only vigorous, healthy plants contribute to our tea.
Weather Awareness: We harvest only in dry conditions. Morning dew or rain-wet leaves introduce excess moisture that complicates processing and compromises final tea quality.
Pollution Awareness: We harvest exclusively from unpolluted sites. If there’s any doubt about air or soil quality, we move on. We’re particularly careful about dirt-road dust and maintain distance from roadways during harvest.
Morning dew on fireweed leaves
Morning dew on fireweed leaves

Maximum Potency: We time our harvest during the massive blooming phase from late June through late July, when research confirms the highest medicinal polyphenol content.¹

Storage and Transport: Fresh leaves are loosely packed into breathable bags and monitored hourly on-site to prevent compression, wind-drying, and overheating from the sun. Twice daily, they’re transported to our processing facility to maintain optimal freshness.

The harvested leaves are kept sheltered from the elements and then transported to the factory.
The harvested leaves are kept sheltered from the elements and then transported to the factory.

The harvested leaves are kept sheltered from the elements and then transported to the factory.

Indigenous Acknowledgement
The fireweed we harvest grows on lands that Indigenous peoples have known and used for countless generations. While our oxidation processing methods draw from Asian tea traditions, we recognize and respect the traditional knowledge that First Nations developed regarding fireweed’s practical and medicinal applications. We are adapting foreign processing techniques to Canadian botanicals, not claiming to revive Indigenous tea traditions.

Tea of the North's Processing Method

At Tea of the North, we’ve spent years learning how to transform wild fireweed into Canada’s first loose leaf fireweed tea. Our artisanal approach combines traditional tea-making wisdom with modern innovation to create a uniquely boreal tea experience. We learned the fundamentals from tea masters in China and Taiwan, Ivan Chai’s techniques from Russia (explore our History of Fireweed Tea article), and refined the rest through countless small batches, trial and error, and meticulous notes on both processing steps and tasting results.

Trip to Taiwan in 2023: a tea master tossing Baozhong leaves during withering.
Portrait of the founder, Julien Drouin-Bouffard, painted by a Taiwanese artist.

Trip to Taiwan in 2023: a tea master tossing Baozhong leaves during withering. Portrait of the founder, Julien Drouin-Bouffard, painted by a Taiwanese artist.

Aerial view of the village of Champneuf and the former sawmill
Aerial view of the village of Champneuf and the former sawmill

Our processing journey takes place in the wilderness of Northern Quebec’s Abitibi region. Here, our factory stands in a small town named Champneuf (meaning Newfield), created from a repurposed wood mill.

How Tea of the North Processes Fireweed: Step-by-Step

Our tea processing style has been inspired by the best teas in the world: Indian Orthodox black tea, traditional Chinese black tea, High Mountain Taiwanese Wulong tea and Yunnan Pu-erh tea. Here are the steps involved in how we make our Original Fireweed Tea and Fireweed Black Tea, and a simple overview of their differences:

Harvesting and withering of high mountain Wulong tea, Lishan, Taiwan, 2023
Harvesting and withering of high mountain Wulong tea, Lishan, Taiwan, 2023

1. Withering

Fresh leaves undergo indoor withering for 12 to 24 hours, reducing moisture content by about 30%. This crucial step makes leaves pliable and initiates biochemical changes. During withering, the room slowly fills with a soft, sweet smell that tells us the leaves are relaxing and ready for the next step.

Technical specifications for boreal teas
Click to enlarge the diagram showing all the processing steps
Withering of fireweed leaves on bamboo trays
Withering of fireweed leaves on bamboo trays
Withering of fireweed leaves on bamboo trays
Withering of fireweed leaves on bamboo trays

Withering of fireweed leaves on bamboo trays

2. Rolling

Rolling bruises the leaf cells to expose leaf juice to oxygen and release natural enzymes and essential oils. We ensure the leaves are properly twisted, not crushed, because whole leaf tea produces a more aromatic, complex cup than the powdered tea found in large-scale facilities using CTC techniques (Crush, Tear, Curl) in India or Kenya. This step is critical for developing fireweed’s unique flavour profile and setting the stage for oxidation, which gives the final dry tea its body and dark colour.

Rolling fireweed leaves in the rolling machine
Rolling fireweed leaves in the rolling machine
Rolling fireweed leaves in the rolling machine
Rolling fireweed leaves in the rolling machine

Rolling fireweed leaves in the rolling machine

3. Oxidation (aka fermentation)

Here’s where the magic happens and the colour of the leaf changes, shifting from light green to dark green or black. We carefully monitor temperature and humidity as enzymatic oxidation (also incorrectly referred to as fermentation) transforms the leaf compounds. Unlike simple drying for herbal tea, this process develops complex flavours such as notes of fruit, honey, malt, and earthy floral. These amazing flavours emerge that simply don’t exist in the fresh plant. This crucial step requires expert timing and attention to the aromatic evolution, based on years of experience.
Fireweed Black Tea: Stronger oxidation resulting in a full-bodied, deeper, smooth fruity taste and a dry leaf that is black in colour.

Fireweed Original Tea: Lighter oxidation resulting in a medium-bodied, more delicate, floral, slightly herbal aroma and a dry leaf that is mostly black with some green in colour, making it visually identical to loose leaf Wulong tea, especially Baozhong from Pinglin in Taiwan.

Semi-oxidized Baozhong leaves from Taiwan
Semi-oxidized Baozhong leaves from Taiwan
Semi-oxidized Original Fireweed Tea leaves
Semi-oxidized Original Fireweed Tea leaves
Oxidation of fireweed leaves turning from green to black
Oxidation of fireweed leaves turning from green to black
Oxidation of fireweed leaves turning from green to black

Oxidation of fireweed leaves turning from green to black

4. Drying

Using carefully calibrated temperature cycles, we halt oxidation at its aromatic peak by drying the leaves, locking in the developed flavours and stabilizing the final product. In both fireweed teas, the leaves are dried at temperatures above 70°C, which destroys the enzyme responsible for oxidation and reduces moisture enough to allow long-term storage at room temperature.

Fireweed Black Tea: Stronger drying cycles provide a subtle, roasted, full-bodied profile.

Fireweed Original Tea: Lighter drying captures more subtle, delicate floral and herbal notes with a medium-bodied profile.

Séchage des feuilles d'épilobe au four à haute température
Séchage des feuilles d'épilobe au four à haute température
Séchage des feuilles d'épilobe au four à haute température
Séchage des feuilles d'épilobe au four à haute température

Séchage des feuilles d'épilobe au four à haute température

5. Aging

We then put the dry leaves in food-grade hermetic bags and let them sit for at least 3 months to allow the tea to balance and develop its final aromas, before it’s ready for sale to customers. This allows the famous fruity aroma of fireweed to emerge and makes the tannins smoother. The tea can actually age for several years and will improve like a good wine over time.

Aged Fireweed Tea: Aged for at least 2 years, the curing process develops smooth, enchanting, gourmet dried fruit notes tenfold, balancing tannins and acidity perfectly.
Bagging the dried fireweed tea and the start of the aging process
Bagging the dried fireweed tea and the start of the aging process
Bagging the dried fireweed tea and the start of the aging process
Bagging the dried fireweed tea and the start of the aging process

Bagging the dried fireweed tea and the start of the aging process

Quality Standards

We follow Canadian food safety regulations to ensure the highest standards at every stage of production. Harvesting takes place exclusively from natural sites away from pollution sources and all processing occurs in our dedicated tea production facility in Abitibi. We maintain rigorous hygiene protocols, detailed processing batch records and complete traceability from harvest to finished product.
  • Click here to watch a beautiful video showing all the processing steps

Fireweed Green Tea

The specific processing methods for our Fireweed Green Tea are completely different from Original & Fireweed Black Teas. We follow the same steps and machinery involved in making traditional Chinese green teas. This involves short withering, fixation, rolling, and drying. Because oxidation is halted early, the leaves retain their fresh green appearance while developing toasted and buttery notes throughout the process.
fireweed black tea
Fireweed Black Tea
Aged Fireweed Tea
Aged Fireweed Tea
fireweed green tea
Fireweed Green Tea

Beyond Fireweed: Other Boreal Teas

We’ve adapted our fireweed tea crafting methods to other local plants. Our Raspberry Leaf and Sea Buckthorn Tea are processed the same way as our Fireweed Black Tea. The results are an incredible depth of flavour we never imagined possible. Every plant has its specifications, so we need to adapt and be creative. Our newest creation, Broadleaf Meadowsweet Tea ( Spiraea alba var. latifolia ), is Tea of the North’s first white tea. Lightly oxidized, it offers an exceptionally smooth cup with sweet, herbaceous, and floral notes and a delicate hint of vanilla. We are currently conducting R&D to create other oxidized teas from our rich boreal flora. Stay tuned for more amazing teas to come! All deliciously transformed by oxidation.

Wild raspberry
Oxidized raspberry leaf tea

Wild raspberry plant and oxidized raspberry leaf tea

Branch laden with sea buckthorn berries
Oxidized meadowsweet leaf tea

Branch laden with sea buckthorn berries and oxidized sea buckthorn leaf tea

Wild broadleaf meadowsweet
Oxidized meadowsweet leaf tea

Wild broadleaf meadowsweet and oxidized meadowsweet leaf tea

The Alchemy of Oxidation

The difference in taste between simply dried fireweed and oxidized (also confusingly referred to as fermented tea) fireweed tea is remarkable. Through years of experimentation, Tea of the North discovered from Asian tea processing methods the key to transforming fireweed from a rather bland taste into a complex, flavourful tea experience: Oxidation.
Left: Oxidized fireweed tea. Right: Dried fireweed herbal tea
Left: Oxidized fireweed tea. Right: Dried fireweed herbal tea Left: Oxidized fireweed tea. Right: Dried fireweed herbal tea
This transformation explains why we say that simply dried fireweed “doesn’t actually taste that good!” It hasn’t undergone the enzymatic changes that unlock incredible notes of fruit, flower and honey. Rolling followed by oxidation releases and multiplies the potent essential oils trapped within the leaves. Heat drying captures them so they are available to be extracted with boiling water into your teacup.

Often mistakenly called fermentation (even by Indian black tea masters), oxidation is actually a biochemical reaction, not a biological one. Fermentation is powered by microbial organisms such as yeast, mould, and bacteria that take different forms: alcoholic (wine, beer), acetic (vinegar) or lactic (sauerkraut, yogourt), for instance. Oxidation, on the other hand, is driven by oxidase, a fascinating enzyme found everywhere in the living world. It’s what causes ripe bananas to brown, cut apples to darken and Camellia sinensis bruised leaves to turn into black tea. Its vital role is helping decompose damaged living organisms and returning them to the soil… nothing is lost, nothing is created, everything is transformed!

Camellia sinensis leaves undergoing oxidation for the production of Wulong teas and black teas in Taiwan
Camellia sinensis leaves undergoing oxidation for the production of Wulong teas and black teas in Taiwan

Camellia sinensis leaves undergoing oxidation for the production of Wulong teas and black teas in Taiwan

The oxidation process is truly transformative. When cells are damaged, oxygen reacts with oxidase to break down the fireweed leaf’s molecules, creating smaller compounds. This includes polyphenols (like ellagitannins and flavonoids) that transform into new volatile aroma compounds: esters, terpenes, and aldehydes (essential oils) that shift the leaf’s profile from grassy to fruity notes. Research has also shown that this process can increase levels of key antioxidant compounds such as oenothein B, which is the polyphenol unique to fireweed with recognized anti-inflammatory and antioxidant properties.1,2 Learn more about fireweed tea health benefits in our Part 5. (to be released soon)
Terpenes are highly aromatic molecules responsible for the fragrance and taste of many plants, including citrus, conifers, spices, hops, and cannabis.
Terpenes are highly aromatic molecules responsible for the fragrance and taste of many plants, including citrus, conifers, spices, hops, and cannabis.

This reaction is also responsible for the colour change in fireweed leaves, turning them from green to black. Oxidation is what causes fruits and leaves to turn brown or black when bruised or cut. It’s called enzymatic browning. You see this with bananas, apples, basil, mushrooms, and more. Every grandmother knows which banana to use to make the best banana bread in the world: the spotted, browning one, of course! That’s oxidation at work, developing richer, sweeter flavour.

Spotted bananas undergoing oxidation
Spotted bananas undergoing oxidation

Artisanal Meets Modern Production

While we began with purely artisanal, hand-rolling methods, growing demand has led us to thoughtfully scale our production. We’ve invested in professional tea-making equipment imported from Fujian province in China, an established tea-producing region. It allows us to maintain consistent quality across larger batches and offer more affordable prices. However, we’ve retained the artisanal touch where it matters most: manual handling and tea craftsman oversight at every stage of production, and small-batch processing for our limited Premium Collection.

Hand rolling of fireweed tea, Kamouraska, 2022
Hand rolling of fireweed tea, Kamouraska, 2022
Machine rolling of fireweed tea, Abitibi, 2025
Machine rolling of fireweed tea, Abitibi, 2025
Each leaf is handled nearly 30 times by our team! Picked, transported, weighed, sorted, withered, stirred, re-spread, rolled, unclumped, oxidized, stirred again, dried, weighed, and finally bagged. No joke. Despite our equipment, a large part of the work remains manual.
Aged Fireweed Tea 2022 from the Premium Collection
From harvest to bagging, the leaves are handled up to 30 times by our team.
From harvest to bagging, the leaves are handled up to 30 times by our team.
From harvest to bagging, the leaves are handled up to 30 times by our team.
From harvest to bagging, the leaves are handled up to 30 times by our team.
From harvest to bagging, the leaves are handled up to 30 times by our team.
From harvest to bagging, the leaves are handled up to 30 times by our team.

From harvest to bagging, the leaves are handled up to 30 times by our team.

Over time, we have learned to notice subtle changes in leaf colour, aroma, and texture that tell us when it’s time to move to the next step. This is a skill that takes years of experimentation to master. It’s not a recipe you simply repeat: we must closely monitor every single step of every batch. Nothing can be taken for granted. We feel a bit like artisanal bakers working with sourdough bread or winemakers fermenting natural wine. Life has its own rhythm and we must go with the flow, not against it. With fireweed, we must adapt every single batch according to multiple variables:

  • Picked leaves evolving throughout the season and from site to site
  • Weather conditions during harvest
  • Humidity, temperature, and airflow in the facility

After enough batches, you begin to feel by touch alone when the leaves are ready. That’s alchemy: when intuition meets knowledge, when nature meets human culture.

Our tea producer touches, smells, and observes the leaves at each stage of every batch.
Our tea producer touches, smells, and observes the leaves at each stage of every batch.
Our tea producer touches, smells, and observes the leaves at each stage of every batch.

From harvest to bagging, the leaves are handled up to 30 times by our team.

“I feel much related to those remarkable tea masters who welcomed me in their small factories in Taiwan and China. Knowledge that has been passed down from father to son for generations. I’m grateful for what they taught me and the relationships we are building. We both work on the same scale with the same techniques and machineries, only the plant and the centuries-transmitted know-how differ.”

Julien Drouin-Bouffard, Tea of the North’s tea producer

Encounters with tea masters during travels in Asia
Encounters with tea masters during travels in Asia
Encounters with tea masters during travels in Asia
Encounters with tea masters during travels in Asia

Encounters with tea masters during travels in Asia

Our approach differs from mass production facilities that prioritise quantity over quality. Even with modern equipment, we process in smaller batches than industrial operations, allowing us to maintain the attention to detail that characterizes artisanal tea. A tea taster evaluates and grades each batch according to our flavour analysis chart, ensuring every tea meets our standards before it reaches customers.

This careful balance of traditional knowledge, intuition, R&D, and modern efficiency allows us to share the exceptional taste of Canadian fireweed tea with tea lovers across the country while maintaining the quality that made Tea of the North’s reputation. It’s proof that with dedication, innovation, and respect for tradition, world-class tea can indeed be made from our boreal flora.

Each batch of tea is evaluated by a taster according to our quality standards.
Each batch of tea is evaluated by a taster according to our quality standards.

Each batch of tea is evaluated by a taster according to our quality standards.

From Our Factory to Your Home

Now that you’ve seen how we transform wild fireweed into tea at our facility in Abitibi, you might be wondering: can I do this myself? The answer is yes! This “do-it-yourself” approach is actually how we started this journey back in 2018! The beauty of this craft is that it doesn’t require professional equipment or years of training to get started. In Part 4, we’ll walk you through five simple steps for making your own fireweed tea at home using nothing more than your hands, a few kitchen basics, and fresh leaves, complete with a step-by-step video to guide you along the way. We’ll also demystify why the process, not the plant, defines the tea and what makes tea caffeinated or not. Finally, you’ll discover how this philosophy is fuelling a global movement of local tea makers. Thanks for reading!

Can’t wait to taste it?

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Our first fireweed teas were harvested and hand rolled in a participatory, community workshop style.
Our first fireweed teas were harvested and hand rolled in a participatory, community workshop style.
Our first fireweed teas were harvested and hand rolled in a participatory, community workshop style.

Follow me in this video where I show you, step by step, how to make your own fireweed tea at home!

Follow me in this video where I show you, step by step, how to make your own fireweed tea at home!

You might also enjoy the subsequent parts of this Complete Guide, which will be published soon.

Join our newsletter to be notified when they will be released.

Written by Drasko Saban
Reviewed by Julien Drouin-Bouffard

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References

  1. Schepetkin IA, Ramstead AG, Kirpotina LN, Voyich JM, Jutila MA, Quinn MT. Therapeutic Potential of Polyphenols from Epilobium angustifolium (Fireweed). Phytother Res. 2016;30(8):1287-1297.
  1. Jariene E, Lasinskas M, Danilcenko H, Vaitkeviciene N, Slepetiene A, Najman K, Hallmann E. Polyphenols, Antioxidant Activity and Volatile Compounds in Fermented Leaves of Medicinal Plant Rosebay Willowherb (Chamerion angustifolium (L.) Holub). Plants. 2020;9(12):1683.
  1. Lasinskas M, Jariene E, Vaitkeviciene N, Kulaitiene J, Adamaviciene A, Hallmann E. The Impact of Solid-Phase Fermentation on Flavonoids, Phenolic Acids, Tannins and Antioxidant Activity in Chamerion angustifolium (L.) Holub (Fireweed) Leaves. Plants. 2023;12(2):277.

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This project was funded by the Ministry of Agriculture, Fisheries, and Food as part of the 2024–2026 Proximité Initiative.