(Trees Reappear Without Planting New Seedlings)

 Africa Surprises the World with an Unexpected Phenomenon

Africa is surprising the world with an unexpected phenomenon. When imagining African landscapes, dust, drought, and sparse vegetation are often pictured. But in central Tanzania, farmers are witnessing something that seems the opposite, yet in a positive way: trees are reappearing in places where they were cut down decades ago, without anyone planting new seedlings.

The “Keseke Hay” Method

According to Econews, the surprise isn't magic, but effective management. Instead of starting from scratch, local communities are working with an “underground forest” of living roots and stumps that haven't completely died, using a method called Farmer-Managed Natural Regeneration (FMNR), known locally as “Keseke Hay,” which means “living stump” in Swahili.

A Forest Hidden in the Light of Daylight

A cut-down tree can look like it's gone, especially in arid regions where the soil is hard and plants struggle. But in many fields, the stump's root system remains alive, sprouting small, weak, shrub-like shoots. The FMNR (Float Regeneration from Roots) technique involves selecting the strongest branches and pruning the rest, concentrating the plant's stored energy on fewer stems. Farmers also protect these branches from grazing.

The Challenge of Survival

Large tree planting campaigns may look impressive in photos, but survival is the hardest part. In the Sahel, researchers and practitioners have noted that "80 percent or more of the planted trees die," largely because the saplings need water and long-term care in areas where both are scarce.

That's why FMNR is such an attractive option. The stump has a deep, well-established underground system, giving the regenerated trees a better start than saplings that still need years to access water.

Protecting New Growth

Just Digit, which works with local partners in Tanzania, describes the Kisiki Hay system as a simple system that can be implemented season after season. Farmers identify the trunks worth preserving, prune them to retain only strong buds, and continue to protect the new growth throughout the year.

They even teach this system as a four-step reminder in Swahili (“chabua tu”), emphasizing selection, pruning, numbering, and continuous protection. This last step is crucial because if goats or cattle graze on the buds out of season, the “new tree” will become firewood tomorrow.

A symbolic tree planting

113 Million Acres of Forest

Tanzania’s forests are largely a model of natural growth. The Forest Trends Data Panel, which summarizes national reports submitted to the Food and Agriculture Organization (FAO), shows that the total forest area was approximately 113 million acres in 2020, of which about 111 million acres were naturally regenerating forests and about 1.24 million acres were planted forests.

In the Dodoma region, where a natural regenerative forest management program has been supported since 2015 and expanded since 2018, conditions are inherently harsh. Annual rainfall ranges from 400 to 570 millimeters, most households rely on rain-fed agriculture, and firewood remains a primary energy source, placing significant pressure on the trees.

Project partners also report rapid growth in impact on the ground. Justdiggit data indicates that over 15.2 million trees have been replanted in Dodoma, with the restoration of approximately 768,000 acres, alongside water-focused projects such as the construction of 120 kilometers of contour ditches, which are expected to "save 5.5 billion liters of water by 2024."

Cooling the Farm and Transforming Daily Life

A 2024 study published in PLOS Climate documents how rural households implementing the FMNR (Floating Natural Resource Management) system in the drylands of central Tanzania describe the links between natural regeneration and health and well-being through group discussions in four villages.

Some of these effects are easy to imagine for anyone who has ever worked outdoors under the scorching sun. In the AFR100 project profile, one farmer describes how adding shade trees through the Kisiki Hay system reduced direct sunlight on the vegetables and seemed to improve both their growing conditions and taste. It’s a small detail, but one that underscores the importance of adopting this concept.

There’s also the broader benefit: increased shade cools the ground and improves soil water retention, extending crop life during harsh droughts when every cloudy day seems like a blessing. The challenge, however, is that these benefits are most pronounced when the trees are protected long enough for them to ripen.

The real challenge

Managed natural resources are not a "plant and leave" strategy, nor are they simply a "supply" strategy. They are more akin to a farming practice that relies on local knowledge, regular pruning, and community norms regarding grazing and logging.

This is why training and follow-up are consistently present in successful programs. The Dodoma program, for example, has mobilized over 110,000 farmers and is planning a long-term sustainability phase to ensure that communities continue to maintain the reclaimed land after intensive support ends.