Lalrinngheti Sangsiama
In a paddy field outside Mualthuam North, in southern Mizoram’s Lunglei district, a family has lost most of a season’s harvest to rats. The rats, by all accounts, came in thousands. They moved through the rice on their bellies. They ate, and went on eating, and when there was nothing left in the field they came into the granaries and into the kitchens. In November 2025, the state’s Department of Agriculture confirmed that 5,317 farming families across all eleven districts of Mizoram had been affected by similar outbreaks; an average of 42 per cent of expected harvest had been destroyed; 1,723 hectares of cultivated land lay ruined; 180 villages had been touched (Government of Mizoram, 2025). The number of affected households continues to rise as I write.
This is not, locally, a surprise. The villagers in Mualthuam knew it was coming. The forest department knew. The state government knew. The international botanical literature knew. Around 1977, the bamboo species Bambusa tulda — known in Mizo as rawthing — flowered across Northeast India, fruited, and died, in the synchronised event that the Mizos call thingtam. Bambusa tulda’s gregarious flowering interval is approximately forty-eight years. Forty-eight years from 1977 is 2025. Almost to the season, the bamboo is doing now what the bamboo did then.
The fact that this was predictable, and that it has nevertheless arrived as a crisis, is the entry point of this essay. The flowering of bamboo in Mizoram is one of the most regular events in the ecological calendar of South Asia. It has shaped famines, military campaigns, the formation of a state, and the political identity of a people. It is documented in oral history going back at least to the early nineteenth century. And it remains, in 2026, scientifically under-characterised, administratively under-prepared-for, and politically under-recognised by the federal apparatus that is supposed to plan for it. This is the paradox, and this essay is an attempt to lay it out plainly.
two cycles, one bamboo state
Most accounts of mautam outside Mizoram conflate two distinct biological events into one. They are different bamboos, different intervals, different scales of consequence. They alternate.
Mautam is the flowering of Melocanna baccifera, the dominant bamboo of Mizoram, locally called mautak or muli. Its gregarious flowering cycle is approximately forty-eight years. Recorded mautam events occurred in 1815, 1863, 1911, 1959, and 2007 (Department of Environment, Forests and Climate Change, Government of Mizoram, n.d.). The next is forecast for 2055–56. Mautam is the larger and more devastating of the two cycles, because M. baccifera produces an unusually large fruit — among the largest of any bamboo, sometimes called the only fleshy-fruited bamboo of South Asia — that supports rat populations at extraordinary density and metabolic intensity (Sabulal et al., 2016).
Thingtam is the flowering of Bambusa tulda, locally called rawthing, on its own forty-eight-year cycle, offset from mautam by approximately eighteen years. Recorded thingtam events occurred in 1785, 1833, 1881, 1929, and 1977 (Department of Environment, Forests and Climate Change, n.d.). The current event began with localised flowering in 2024 and is unfolding through 2025–26, exactly when predicted.
Locally the alternation is described as a thirty-year gap from thingtam to mautam followed by an eighteen-year gap from mautam to thingtam, repeating. In practice, this means Mizoram is never more than three decades from the next gregarious flowering, and never more than two from the last. The bamboo flowering cycle is not a one-off ecological curiosity but a recurring structural feature of the regional landscape, woven into agricultural calendars, political memory, and policy planning at intervals an Indian government can plan for, in principle, if it chooses.
The choice has, historically, not been made.
the biology of a synchronised event
What kind of plant flowers once every fifty years? Almost no other genus does. Some agaves, some palms, the Strobilanthes kunthiana of the Western Ghats — which produces the famous neelakurinji bloom on a twelve-year cycle — and a small number of bamboo species worldwide. The bamboos are the puzzle. Among the more than 1,200 known bamboo species, a few flower annually or sporadically, and a smaller subset flower gregariously on extended cycles ranging from three to approximately 150 years (Janzen, 1976; Koshy et al., 2022).
Melocanna baccifera is the most punctual gregarious flowerer in the global record. The thirteen-year observational study at the Jawaharlal Nehru Tropical Botanic Garden and Research Institute in Thiruvananthapuram, which monitored eight clumps from 2009 through 2022, found that flowering events for individual clumps lasted between twenty and one hundred and twenty months — but that the species’ multi-decade synchronisation across vast geographies remains essentially unexplained at the molecular level (Koshy et al., 2022). Why does a species flower in 1959 in Mizoram, in 1959 in Bangladesh, in 1959 in Myanmar, and then again in 2007 across the same vast range, with a precision of months? The answer is not known. The leading hypothesis — that an internal genetic clock in the plant counts approximately forty-eight cycles of some yet-unidentified environmental signal — is testable in principle but has not been tested in practice. It is one of the larger unanswered questions in plant biology.
What is established, however, is the consequence. M. baccifera fruit is unusual: a fleshy, pear-shaped berry, two to four inches long, produced in such quantity that fall counts on a single clump have been measured at over thirty-eight thousand fruits during a single flowering (Koshy et al., 2022). Per hectare, the literature reports fruit production approaching eighty tonnes during peak flowering (Sabulal et al., 2016). Compositionally, the fruit is approximately fifty per cent starch, twelve per cent protein, and rich in amino acids that interact in unexpected ways with rodent reproductive biology.
This last point is where the science has only recently begun to catch up with the ecology. A 2025 study by Naithani and colleagues at JNTBGRI demonstrated that male mice fed M. baccifera fruit liquid showed dramatically elevated mating frequency (5.5 ± 1.7 mounts versus 2.0 ± 0.8 in controls), elevated nitric oxide levels (a 132 per cent increase), and altered follicle-stimulating and luteinising hormone profiles (Naithani et al., 2025). The fruit is not merely abundant food; it appears to be a potent reproductive trigger. The “rat flood” — locally called zukam, the rat sickness — is not just a story of food availability inflating a rodent population in the standard ecological way. It is, on the available evidence, an endocrine event. The bamboo, it turns out, is not just feeding the rats. It is making them breed faster.
This is a remarkable finding. It also remains, as of writing, unreplicated and at preprint stage, and it speaks to a much larger pattern: the science of mautam and thingtam is genuinely young. The botanical literature is decades behind what the agricultural and human costs of these events would justify. There is, for example, no published peer-reviewed economic damage assessment of the 2007 mautam in Mizoram. There is no comprehensive comparative ecological study across the affected states (Mizoram, Tripura, Manipur, Meghalaya, Assam) of the 2005–08 event. There is no published forecasting model that integrates the partial-flowering precursors with the main event — even though, as the current 2024–26 thingtam shows, partial flowerings of related bamboo species often precede the main cycle by a year or more, providing a window of advance warning that no formal monitoring system currently captures (Northeast Now, 2022).
The mismatch between the regularity of the event and the patchiness of the science is one piece of the paradox.
what 1959 became
In 1958, a Mizo District Council request for emergency famine preparation was sent to the government of Assam, of which Mizoram was then a district. The request cited approaching mautam, expected from late 1958 into 1960. It cited oral history. It cited the previous mautam of 1911. It asked for grain stocks to be pre-positioned, for road infrastructure to be prepared, for a state response to be organised in advance.
The request was, in the words of one historical account, “scoffed at by state authorities” who treated tribal predictive ecology as folklore (Pachuau and van Schendel, 2015, cited in Brown, 2022). When the bamboo flowered the following year, when the rats came, when the rice failed and the maize failed and the famine began in earnest, the response was inadequate to a degree that became politically formative. Estimates of mortality in the 1959 famine vary widely; figures of 100 to 15,000 deaths have been reported (Sabulal et al., 2016; Wikipedia, 2025), with the variation reflecting the limited ground-truth recording during the event. The lower end represents documented starvation deaths; the upper end attempts to capture excess mortality including disease and malnutrition complications. Either figure, in a population of approximately 250,000 at the time, represents a profound disruption.
What happened next is well documented in the political-historical literature on Northeast India. In 1960, a Mizo Cultural Society reorganised itself as the Mautam Front, dedicated to famine relief. In September 1960 it became the Mizo National Famine Front. In 1961, under the leadership of Pu Laldenga, it shed the famine designation and became the Mizo National Front (MNF), a political organisation pursuing autonomy and, eventually, secession. On 1 March 1966, the MNF declared independence from India, attacking the treasury at Aizawl and security outposts in Lunglei and Champhai. The Indian state’s response over the days that followed included the only deployment of the Indian Air Force in offensive operations within the country’s own territory: bombing runs over Aizawl by jet aircraft, an event that the Indian government denied for decades and that has only in recent years been formally acknowledged in mainstream Indian press (ThePrint, 2023).
The insurgency that began in 1966 lasted twenty years. It ended with the Mizoram Peace Accord of 30 June 1986, signed between Rajiv Gandhi and Laldenga, under which Mizoram was granted full statehood. On 20 February 1987, Mizoram became the 23rd state of the Indian Union (Wikipedia, 2026; Brown, 2022). The accord remains one of the rare instances globally of a complete insurgent organisation disarming voluntarily and being absorbed into democratic politics; the MNF has formed the state government in Mizoram three times since.
A bamboo flowered. A famine followed. A government failed. A state, eventually, was born. This is the historical sequence. It is also the sequence that, for any planner sitting in Delhi or Aizawl now, ought to be weighing on every conversation about thingtam preparedness in late 2025.
The political historian Sajal Nag, whose 1999 paper in Economic and Political Weekly remains the most cited single account of the political consequences of mautam, makes the argument cleanly: the famine of 1959 was not merely an ecological event with political aftermath. It was a state-building failure that delegitimised the existing administrative arrangement and created the conditions for a coherent alternative political project (Nag, 1999). The bamboo did not cause the insurgency. The state’s response to the bamboo did.
2007, and the lesson the state learned
By the time the next mautam arrived in 2005–08, the political stakes were different and the institutional capacity was substantially greater. Mizoram was now a state. The Government of Mizoram launched the Bamboo Flowering and Famine Combat Scheme (BAFFACOS) in August 2004, a year ahead of the predicted flowering, in explicit anticipation (BAFFACOS, 2009; Naithani et al., 2025). Under BAFFACOS, farmers were supplied with traditional rat traps and chemical rodenticides at no cost; alternative food crops (maize, ginger, turmeric) were promoted to reduce reliance on rice; a ₹800 crore central package was secured for rural support; emergency grain reserves were positioned in advance; and ground-level monitoring was established to track flowering progression and rat populations across districts (Department of Environment, Forests and Climate Change, n.d.; Sabulal et al., 2016).
The 2007 mautam still caused significant agricultural damage. Approximately 1.76 million hectares of bamboo flowered and died across Northeast India (Sabulal et al., 2016). Crop losses were substantial. But there were no reported starvation deaths, and the political consequences of the event were absorbed within the existing democratic framework rather than precipitating a new political crisis. This was, by the standards of every previous recorded mautam, an unprecedented improvement.
It would be a mistake to read too triumphal a story into this. The 2007 response succeeded because it was prepared for, because the state existed and was led by a political class drawn substantially from the very organisations that had emerged from the 1959 failure, and because central government funding flowed in scale and on time. None of these conditions is automatic. None can be assumed.
What the 2007 response did establish, however, is that the mautam-thingtam cycle is governable. It is not a natural disaster in the sense of being unpredictable. It is a forecastable event that can be prepared for, mitigated, and absorbed without political fracture, when the institutional will exists. The question is whether that will exists for the current cycle, and whether it will exist for the larger cycle thirty years from now.
what is happening, in the field, now
The current thingtam began with localised early-flowering signals in 2022, when 114 villages reported rat infestations attributed to partial flowering of Dendrocalamus species (locally called rawnal) and what was then identified as the leading edge of B. tulda flowering (Northeast Now, 2022). State officials at the time described these reports as “preliminary signs” of the larger thingtam expected in 2025. They were correct.
By November 2025, the Government of Mizoram’s Department of Agriculture confirmed thingtam-attributed crop loss across all eleven districts. The geographic distribution mirrors the historical pattern of bamboo flowering propagation: starting in southern Mizoram, particularly Lunglei district along the Tripura and Mizoram borders, and spreading northward (Department of Environment, Forests and Climate Change, n.d.; Lunghkim, 2025). The worst-affected districts as of late 2025 were Mamit and Lunglei in the south, with Mamit reporting rodent attacks across 255.7 hectares of paddy field in nineteen villages.
The state government has formally requested that thingtam be designated a disaster under existing relief frameworks, which would unlock central funding and emergency provisions (Ajmal IAS Academy, 2025). As of writing, this designation has not been confirmed. The 2025–26 thingtam is, in effect, being managed by Mizoram alone, drawing on the institutional muscle memory of the 2007 response but without — yet — the central package that made the 2007 response possible.
This matters because thingtam, while smaller in scale than mautam, is also less well resourced. The 2007 response benefitted from being the first major mautam in independent India where federal and state frameworks aligned. The 2025–26 thingtam is being navigated under more austere fiscal conditions, with attention from Delhi spread across other northeast crises (Manipur’s continuing ethnic conflict; the demographic disturbances along the Bangladesh border) and with a media cycle that has, on the whole, treated thingtam as a regional curiosity rather than a federal preparedness test for the much larger mautam to come.
It is also a rehearsal. Whatever institutional capacity the state of Mizoram and the central government build or fail to build around the 2025–26 thingtam will form the substrate on which the 2055–56 mautam response is constructed. Thirty years out, there is a generational handover problem on the horizon: the bureaucrats and political actors who experienced the 2007 mautam in their early careers will have largely retired by 2055. The institutional memory of how to prepare for these events lives only as long as the institutions actively practise it. Thingtam is the practice.
what the peer-reviewed record is missing
I write this as a researcher whose own work intersects with this history at a particular angle — the acoustic and material characterisation of M. baccifera — and I am aware that my view of “what the record is missing” is shaped by what I am personally trying to add. I will try to be honest about the broader picture rather than self-promotional.
Several things the international research literature does not currently contain:
A comprehensive comparative ecological dataset on the 2005–08 mautam. The damage figures, the rat population dynamics, the recovery trajectories of the bamboo stands, the secondary effects on other forest fauna — these are recorded in patchy government reports and grey literature, but no peer-reviewed synthesis study has been produced for what is, in effect, the most thoroughly responded-to mautam in recorded history.
A continuous monitoring system for the partial-flowering precursors that announce the larger event. The 2022 reports of Dendrocalamus flowering ahead of the main thingtam show that the bamboo gives warning before the main event arrives. There is no formal system for capturing these warnings into official forecasts.
A peer-reviewed economic impact assessment for the 1959 famine. The mortality figures cited above (100 to 15,000) span two orders of magnitude. This range itself is a research scandal: a famine consequential enough to alter the political geography of India is documented at this level of imprecision in 2026.
A material-properties database for M. baccifera sufficient to support modern engineering specification. This is the gap my own work attempts to address. The dominant species of the dominant bamboo state of Northeast India remains, in 2026, without a published acoustic, mechanical, or systematic durability characterisation. International material databases that include Phyllostachys edulis, Guadua angustifolia, and dozens of other commercial bamboo species do not include M. baccifera. A regional industry that planning documents have repeatedly identified as having transformative potential for the state cannot — because the data does not exist — be specified by an engineer outside Mizoram into a structural drawing.
An integrated research programme that connects the ecological, economic, political and material dimensions of the bamboo flowering cycle. The botanical work (Koshy et al., 2022; Naithani et al., 2025) is excellent on its terms, but it has not been linked to the agricultural work, the political-historical work (Nag, 1999; Brown, 2022), or the engineering and material-science work in any organised way. Each of these literatures speaks past the others.
The mautam paradox is not just that an ecological event of generational consequence has been chronically under-prepared-for. It is that the science of the event has been chronically siloed, with botanists publishing in plant journals, political historians in Economic and Political Weekly, engineers in materials journals, and forestry officials in grey literature, none of them building a shared framework. The species at the centre of all of it has, for two hundred years of recorded flowering events, been studied as if it belonged to several different worlds.
why this should matter to readers outside the region
I am writing this for an audience that may have heard of Mizoram only as a name on a map of India’s north-eastern fringe — a small, predominantly Christian state with a population of just over a million, sharing borders with Bangladesh and Myanmar, occupying roughly the area of Belgium. The reasons I think this story should travel are four.
First, the mautam-thingtam cycle is, in effect, India’s most predictable famine-risk event, and a stress test of whether the federal system can plan for known future crises that do not fit a four- or five-year electoral cycle. The next mautam will arrive almost exactly thirty years from now. If we cannot prepare for an ecological event that the bamboo itself has been broadcasting for decades, we will not prepare for any of the other slower crises — climate-driven monsoon variability, glacial-melt water shifts in the Himalayan headwaters, soil exhaustion on the central plains — that operate on similar or longer timescales.
Second, the ecological mechanism of the rat flood may have larger biological implications than the regional context suggests. If M. baccifera fruit indeed acts as a hormonal trigger to rodent reproduction at the scale Naithani and colleagues suggest, the implications for understanding mast-seeding events in other plant families are substantial. Mast seeding is a globally distributed phenomenon — oak masts in Europe and North America, beech masts in Japan, Dipterocarpus masts across Southeast Asia. The Mizoram bamboo case may turn out to be unusually instructive precisely because the cycle is so regular and the trigger so distinct.
Third, the political history of Mizoram is one of the more remarkable transition narratives in post-independence Indian governance. A famine led to an insurgency; an insurgency led to a peace accord; a peace accord led to a state that, by most contemporary metrics — literacy, internal security, public health — outperforms many of its neighbours. The accord of 1986 is studied in international peace-process literature as an example of full-organisation disarmament successfully integrated into democratic politics (E-International Relations, 2022). The trajectory from 1959 to 2026 is not inevitable. It is the result of specific political choices, made over decades, against the grain of the patterns that more typically follow ecological-economic crises in poor regions.
Fourth, the broader pattern of state failure to plan for predictable ecological events has direct relevance to the Anthropocene framing of contemporary environmental governance. The mautam is not climate change. It is not anthropogenic in origin. But the failure pattern around it — predictable event, ignored warnings, inadequate response, political consequence — is exactly the failure pattern that climate adaptation governance is producing at larger and larger scales worldwide. The mautam is a case study in what happens when a state does not, or chooses not to, plan for events that are biologically certain and decades away.
the paradox, again, in closing
A bamboo that flowers once in fifty years is, for almost every administrative purpose, invisible. It is not in the year-on-year crop assessment. It is not in the five-year plan. It is not in the political horizon of any government that has to answer to a five-year electoral mandate. It is not, in any meaningful operational sense, in the international development metrics by which Northeast India is benchmarked.
And yet, every time the bamboo flowers, it reorganises the state. It rearranges agriculture, demography, politics, and policy. The 1959 mautam produced a state. The 2007 mautam produced an institutional capacity. The 2025–26 thingtam is testing whether that capacity has been maintained. The 2055–56 mautam will test, in a way nothing else does, whether the lessons of 1959 and 2007 have been remembered.
This is the paradox: the most consequential ecological event in the political history of a state of India is also the least studied, the least prepared-for, and the least attended-to in the federal apparatus that is supposed to plan for it. The bamboo is not hiding. It has been broadcasting its schedule for two centuries. The only question is whether anyone is listening when it does.
In Mualthuam North, the family whose paddy field was destroyed in November 2025 will need help to plant again next season. The aid, if it comes, will be classified under a category of disaster relief that does not have a column for “ecological event predicted by oral history fifty years in advance.” There is no such column. The bamboo, however, knows the schedule. It has been keeping it for as long as anyone has been counting.
The next mautam is thirty years away. The next thingtam is here. Together, they constitute a problem the federal Indian state has chosen, repeatedly, to confront only when it has already arrived. The cost of that choice has been counted, more than once, in lives. The opportunity it represents — to prepare, properly, for an ecological event whose date is essentially known — has been counted exactly never.
This essay will be revised as the current thingtam unfolds and as state response data becomes available through 2026. Updates will be appended; figures and citations will be corrected as new sources emerge. The author welcomes correspondence from readers in Mizoram, in Northeast India, and in the wider research community working on bamboo, mast seeding, rodent ecology, or Indian famine history. Write through the contact form.
references
Ajmal IAS Academy (2025) ‘Mizoram seeks disaster tag as rats devour crops’, Ajmal IAS Academy, 13 October. Available at: ajmalias.com (accessed November 2025).
BAFFACOS (2009) Bamboo Flowering and Famine Combat Scheme: progress report. Aizawl: Government of Mizoram.
Brown, J.K. (2022) ‘Building the state and conceiving the nation: the origins of separatist insurgency in the Mizo Hills, 1945–61’, Contemporary South Asia, 30(3), pp. 391–409.
Department of Environment, Forests and Climate Change, Government of Mizoram (n.d.) Bamboo resources in Mizoram. Available at: forest.mizoram.gov.in/page/bamboo-resources-in-mizoram (accessed November 2025).
E-International Relations (2022) ‘A peaceful resolution: analysing sustained peace and order in Mizoram’. Available at: e-ir.info (accessed November 2025).
Government of Mizoram, Department of Agriculture and Farmers’ Welfare (2025) Crop loss assessment, thingtam 2025–26: preliminary report. Aizawl, November.
Janzen, D.H. (1976) ‘Why bamboos wait so long to flower’, Annual Review of Ecology and Systematics, 7, pp. 347–391.
Koshy, K.C., Gopakumar, B., Sebastian, A., Nair, A.J.S., Johnson, A.J., Govindan, B. and Baby, S. (2022) ‘Flower-fruit dynamics, visitor-predator patterns and chemical preferences in the tropical bamboo, Melocanna baccifera’, PLoS ONE, 17(11), e0277341.
Lintner, B. (2016) Great Game East: India, China, and the struggle for Asia’s most volatile frontier. London: HarperCollins.
Lunghkim (2025) ‘Thingtam scourge: over 5,300 Mizoram farmers face devastating crop loss due to rodent outbreak’, Lunghkim, 28 November. Available at: lunghkim.wordpress.com (accessed November 2025).
Nag, S. (1999) ‘Tribals, rats, famine, state and the nation’, Economic and Political Weekly, 34(12), pp. 725–729.
Naithani, K., Govindan, B., Krishnaraj, M., Anil Kumar, S.T., Anil John Johnson, Ajikumaran Nair, S., Baby, S. and Koshy, K.C. (2025) ‘How rat flooding occurs during mast seeding of Melocanna baccifera?’, bioRxiv preprint. doi: 10.1101/2025.07.17.665385.
Northeast Now (2022) ‘Mizoram: efforts underway to avert famine, 114 villages infested by rodents’, Northeast Now, 4 October. Available at: nenow.in (accessed November 2025).
Pachuau, J.L.K. and van Schendel, W. (2015) The camera as witness: a social history of Mizoram, Northeast India. Cambridge: Cambridge University Press.
Sabulal, B., Anil Kumar, S.T., Mathew, J., Ajikumaran Nair, S., Anil John Johnson, Govindan, B. and Koshy, K.C. (2016) ‘Nutritional properties of the largest bamboo fruit Melocanna baccifera and its ecological significance’, Scientific Reports, 6, 26135.
ThePrint (2023) ‘When Indira Gandhi faced raging Mizo insurgency — IAF’s 1966 Aizawl air strike & birth of a state’, ThePrint, 12 August. Available at: theprint.in (accessed November 2025).
the third in a continuing series of essays on bamboo, biology, policy and place. companion essays: ‘learning to listen’, ‘the curve and the outlier’, ‘bamboo is not timber’.