Every spring, in the mid-hills of Lamjung, Kaski, or the Hongu valley further east in a region called Mahakulung, a man climbs a ladder made of bamboo and vine, hanging off a bare cliff face while smoke rises from a fire lit somewhere below him. Above him is a honeycomb the size of a dinner table, built by the world's largest honeybee. He has come to bring it down. His community has done this for generations, timed to a flowering season that no longer arrives when it used to.
This is Nepal's mad honey, known locally as bhir maha. It comes from Apis laboriosa, the Himalayan giant honeybee, which nests out in the open on sheer cliffs between 2,500 and 3,000 metres rather than in enclosed hives. What makes the honey unusual is not the bee but what it feeds on. For a few weeks each spring, when rhododendron comes into bloom, the bees forage almost entirely on that nectar, and the plant's grayanotoxin, its natural chemical defence that carries through into the honey.
In small doses, this produces the warming, faintly narcotic sensation prized in folk remedies. But the margin is thin, doses as small as a tablespoon have caused measurable bradycardia in reported cases, and one case report found that just one to two teaspoons of locally harvested honey was enough to bring on nausea, hypersalivation, hypotension, and sinus bradycardia within two hours of ingestion (Paudel & Khanal, 2025). In more severe cases, patients have needed ICU admission, with symptoms resolving within 48 hours through oxygen, intravenous fluids, ondansetron, and atropine (Van Ligten et al., 2025). Villagers have always known this by instinct, long before anyone explained it in the language of sodium channels and nerve receptors. Honey gathered later in the year, once other flowers dominate, is far milder.
None of that knowledge came from a textbook. It came from generations of hunters paying close attention: which weeks were safe to harvest, which batches to treat carefully, how the honey changed once the rhododendron bloom passed. It is a form of climate literacy that predates the term itself.
A Harvest Getting Harder to Predict
That knowledge depends on one thing above all: a bloom window that holds roughly still from year to year. A warming climate is exactly what disrupts that kind of precision.
Hunters in Lamjung describe cliffs that once held hive after hive now standing empty. Doodh Bahadur Gurung, 65, taught his son Som Ram everything he knows about reading these cliffs, and has watched the change happen within his own lifetime. He points to several causes layered on top of each other: increasingly irregular rainfall, more frequent wildfires, pesticide drift from nearby farms, and rivers diverted by a surge of hydropower construction, all of it drying up the water sources bees depend on. Bees that forage near farmland run into pesticides that kill them outright.
Gurung recalls a harvest that once brought in a thousand litres a season from a single village; these days, he says, a village is fortunate to see a quarter of that. Where hives once dotted almost every cliff, drawn by wildflowers and nearby water, they are harder to find each year.
The bees themselves are wild in a way that leaves them little room to adjust. They cannot shift their behaviour around human activity or a changing calendar the way some domesticated species can. When the bloom shifts, they are caught out by it, and so are the people whose livelihoods are timed to that same narrow window.
A Market That Complicates the Picture
As the honey has grown scarcer, it has also grown more valuable. Hunters describe prices rising severalfold over the past two decades, driven by growing international interest and the honey's online reputation as a wellness product. That demand pulls in two directions at once: it places greater value on a tradition worth preserving, but it also pressures some communities to harvest earlier or more often than the bloom cycle or the bee population can sustain.
Meanwhile, very little of this honey reaches international markets through official channels. Nepal has effectively been unable to export animal-origin products like honey to the European Union since 2008, after residue-testing standards were not met, and the laboratory infrastructure needed to meet them has been slow to develop. What does reach buyers abroad mostly moves through informal, direct-to-buyer channels, outside any residue-testing or traceability system. That gap has also opened space for imitation, honey blended down or re-labelled as the real thing, since a jar with no documented cliff or harvest season is hard for a buyer to verify. The surest safeguard, in the absence of that testing, tends to be the story behind the jar; a genuine seller can usually name the cliff, the season, and the community that climbed for it.
The Same Story, a Different Crop
For anyone working on climate and rural livelihoods in Nepal, this will sound familiar. It is the same pattern showing up in maize and millet fields across the mid-hills, where planting calendars built around a monsoon onset no longer line up with when the rains actually arrive. The honey hunters of Lamjung and the smallholder farmers of the same hills are contending with a shared problem: knowledge refined carefully over generations, running up against a climate that no longer holds still long enough for that knowledge to keep working.
With honey harder to find, fewer young people are choosing to learn the trade. It takes strength, skill, and a tolerance for real risk, and the income no longer competes easily with other options, including factory work abroad. That, too, is part of what gets lost as the bloom window narrows, not just bees and honey, but the next generation willing to climb for it.
What is at stake is not only a livelihood or a jar of honey. It is the fit between a practice and the world it was built to read. As both the bees and the bloom shift, that fit is what is quietly coming apart, a small, vivid example of what climate change actually does to a place like Nepal's mid-hills: not one dramatic event, but a slow erosion of the fit between traditional practice and the world that practice was built to read.
Knowledge Older Than the Explanation
What strikes me most isn't the toxicology, real as it is, but how much the Gurung and Kulung Rai communities understood about their environment long before anyone put a name to grayanotoxin or sodium channels. They knew which weeks were safe to harvest and which honey batches to treat with caution, encoded not in a lab but in oral tradition passed from hunter to hunter, generation to generation.