Add offer

Sorghum and pearl millet: farming the Sahel

Discover the African histories of sorghum and pearl millet: Sudan, Mali, domestication evidence, pottery impressions and early connections with Asia.

4th–3rd millennia BCE · Sahel: northern Mali and eastern Sudan · Domestication & settlement

African agricultural history includes independent processes of crop domestication that cannot be reduced to a single event. Sorghum is associated with the eastern Sahel and Sudan, while pearl millet has its origins in the western Sahara and Sahel. Pottery impressions, charred grains and genomic research help reconstruct these histories while distinguishing the collection of wild plants, cultivation and the establishment of domestication traits.

Two cereals and two regions of origin

Sorghum, Sorghum bicolor, and pearl millet, Cenchrus americanus, are different plants. The latter appears in many publications under the name Pennisetum glaucum. It is not broomcorn millet, Panicum miliaceum, familiar from Eurasian agricultural history. Clarifying these names matters historically: placing every discovery loosely described as “millet” on one map could merge different species and independent domestication processes into a misleading story.

For sorghum, important early evidence comes from eastern Sudan. For pearl millet, material from northern Mali is crucial, alongside research supporting a western Saharan origin. The Sahel is an extensive belt of environments and communities, rather than a single archaeological site. Comparing the two crops reveals the diversity of African innovation; it does not imply that they originated in the same village, within one century or inside boundaries corresponding to present-day countries. Regional labels locate the discussion, but they should not suggest that ancient farming followed modern political borders.

Seasonal environments, rather than a timeless desert

The present-day appearance of the Sahara should not be projected directly across its entire prehistory. Moisture, vegetation and opportunities for land use changed, while local depressions, valleys and soils created different farming conditions. Pearl millet is adapted to difficult environments, including poor soils and limited rainfall. This helps explain its later importance, but a plant’s tolerance alone cannot establish when or where cultivation began.

Sowing grain connects several rhythms: the arrival of rain, crop maturation, the availability of labour and the ability to retain part of a harvest. Farming therefore needs to be considered alongside other ways of obtaining food and the movement of people. A simple formula in which drying conditions automatically produce cultivation overlooks differences between regions and community responses. Environmental change can create pressure or opportunity, but the historical mechanism must be demonstrated at particular sites. It also matters whether a crop was one option among several or had become a major source of subsistence.

Sorghum in eastern Sudan: fourth-millennium BCE evidence

Analysis of plant impressions in Butana Group pottery provided evidence for a sorghum domestication process in eastern Sudan during the fourth millennium BCE. Spikelet structures are particularly informative because their anatomy can indicate how seeds separated from the plant. Natural seed shedding is advantageous in wild populations. In plants harvested and resown by people, forms that retain grain until harvesting can become more prominent.

The occurrence of wild and domesticated characteristics together supports a process unfolding over time. It does not describe an instantaneous replacement of one uniform crop by another within a single growing season. Material from the Kassala area in the second millennium BCE likewise shows why sorghum use and cultivation require investigation of changing combinations of traits. “Domesticated” remains a useful category, but it should not conceal crossing with wild plants or variation in local harvesting and sowing practices. Different features need not change at the same rate across a large region.

Pearl millet in Mali: a long transition recorded in pottery

Research at three sites in northern Mali examined plant material added to pottery clay. Fifth- and fourth-millennium BCE material documents the use of wild pearl millet, and the researchers consider cultivation preceding full domestication. Clear domestication characteristics occur in the third millennium BCE. Changes in grain size and structures involved in seed shedding did not necessarily occur simultaneously, so a single measurement cannot provide a complete diagnosis.

A pot becomes an accidental archive of crop processing. Plant fragments used as temper can leave cavities whose shapes are investigated through casts, microscopy or tomography. Such a discovery indicates material available when pottery was made, but does not automatically reconstruct the proportions of all crops grown. Choice of temper, preparation of the clay and preservation can affect the number of identifiable impressions. Establishing a cereal’s presence is therefore a different task from estimating its dietary importance. The value of ceramic evidence is greatest when combined with other securely contextualised material.

Genomes, grains and impressions answer different questions

Comparisons of pearl millet genomes support a domestication centre in the western Sahara. A genetic reconstruction describes relationships and population history, whereas an archaeological specimen places a plant at a particular location and time. These are complementary scales of observation. An origin model does not supply coordinates for the first cultivated field, and the oldest site discovered so far need not lie at the precise centre of the whole process.

Dating requires similar care. A result obtained directly from a grain links an age to that specimen. Charcoal from the same layer requires an additional assessment of its association with the plant remains; old wood or displaced sediment can complicate the interpretation. A radiocarbon range remains a range even when a diagram represents it with one point. Maps should therefore distinguish find locations, proposed regions of origin and hypothetical dispersal routes. Those distinctions make a visual explanation more informative while preventing an uncertain reconstruction from appearing to be an observed journey.

From Africa to the Indus: new dates and unresolved routes

A study published in 2025 reported direct dates for pearl millet grains from Bhando Qubo in present-day Pakistan, placing them around 2500 BCE. The result moves its securely documented presence in South Asia earlier than many older accounts allowed. The crop’s African origin and its Asian archaeological presence show that the long-distance movement of cultivated plants has a very deep history.

This does not establish a complete route or date every stage along it. Possible connections through northeastern Africa, coastal regions and maritime networks remain under discussion, with gaps between known sites. An arrow on a map should represent a hypothesis where no chain of dated discoveries establishes the journey. Chronologies also need to remain open to revision: a new directly dated specimen can change the picture of dispersal even when an older publication accurately summarised the evidence then available. Distinguishing the date of a discovery from the date of the ancient plant helps readers understand why historical accounts change.

After domestication: crops and farming systems kept changing

Domestication does not bring a cereal’s evolution to an end. Research on ancient sorghum genomes from Egyptian Nubia identified successive changes involving selection, genetic diversity and crossing between lineages. These samples concern a later history in a particular locality, rather than directly documenting the earliest Sudanese fields. Their importance lies in demonstrating that biological change continued long after traits associated with domestication had appeared.

Crop combinations changed as well. At Sadia in Mali, archaeobotanical research documents the importance of pearl millet and subsequent diversification involving plants such as sorghum, fonio and African rice. This medieval example does not prove that an identical system existed thousands of years earlier. Instead, it shows why agricultural history must include choosing plants for particular places, exchanging seed and maintaining varied sources of food. Ending the account with the oldest grain would overlook much of the knowledge and experimentation that shaped farming in later centuries.

Historical significance: African knowledge and multiple solutions

Sorghum and pearl millet document the active contribution of African communities to the development of food production. People in different regions worked with local plants, and successive generations maintained and altered crop characteristics through their practices. Domestication is therefore both a biological process and a history of labour: harvesting, processing, retaining grain and sowing again. It cannot be attributed to one undifferentiated “African culture”. Recognising regional diversity makes those contributions more visible.

Comparing the two cereals also shows how to construct a reliable public history. The species, region, type of evidence and confidence in dating should all be stated. Distinguishing important fourth-millennium BCE sorghum evidence from clear third-millennium pearl millet domestication traits preserves their separate chronologies. This approach makes room for farmers’ knowledge and for new discoveries that may fill gaps in the map. Its purpose is to explain a process rather than rank the oldest civilisations. The result is a history in which uncertainty improves precision instead of diminishing the importance of the achievement.

Questions and answers

Were sorghum and pearl millet domesticated in the same place?

No. Important early sorghum evidence comes from eastern Sudan, while the western Sahara, Sahel and northern Mali are central to pearl millet’s origins. They represent distinct regional histories.

Is pearl millet the same as broomcorn millet?

No. Pearl millet is Cenchrus americanus, frequently called Pennisetum glaucum in the literature. Broomcorn millet is Panicum miliaceum. Similar common names do not imply a shared domestication process.

When did African pearl millet reach Asia?

Direct dates published in 2025 place it at Bhando Qubo in the lower Indus Valley around 2500 BCE. The precise route by which it travelled from Africa remains unresolved.

Sources

History of agriculture: all topics