Luxembourg’s Hëllef fir d’Natur Foundation has reported that on Wednesday 25 March 2026, it carried out the planting of three aspen poplars (Populus tremula) in the Mensdorf-Brill nature reserve, in the immediate vicinity of the ponds frequented by water buffalo.
The foundation said this initiative forms part of the promotion of the “Tree of the Year” in Luxembourg and reflected its ongoing commitment to biodiversity and the restoration of natural habitats.
Hëllef fir d’Natur said: “This planting responds to an ecological necessity. The hybrid poplars that previously occupied this small woodland area on the edge of the pond are a non-native species now exhausted by age. Weakened by the widespread presence of mistletoe and increasingly vulnerable to climate change and repeated periods of drought, these trees have almost entirely died off.”
In response to the near-total disappearance of this woodland, the Foundation said it had chosen to restore it using a suitable native species: the aspen poplar. This replacement helps preserve the vegetation structure adjacent to the pond, maintain a valuable wooded screen for wildlife and strengthen the resilience of this ecosystem in the face of future climatic challenges.
The Aspen Poplar, Tree of the Year in Luxembourg
Each year, Hëllef fir d’Natur selects a species to highlight. For 2026, it chose the aspen poplar, a deciduous tree from the Salicaceae family, known for its remarkable ecological and landscape qualities. The foundation said its advantages include:
⁃ its rounded leaves, with long flattened stalks, tremble at the slightest breath of wind—hence its name “trembling aspen”;
⁃ a quintessential pioneer species, it rapidly colonises open spaces, adapts to both poor and moist soils and spreads efficiently through root suckers and shoots;
⁃ it can reach fifteen to 25 metres in height, live up to 100 years and develop a trunk up to one metre in diameter;
⁃ recognised for its medicinal properties (salicylic acid), it is also used in light carpentry, including the production of panels, flooring and sauna wood.
The Foundation detailed that it is increasing its planting of aspens year by year: 275 specimens were planted in 2024, 625 in 2025, with further plantings planned for 2026 within mixed deciduous forests.
A valuable choice for biodiversity
The aspen poplar is regarded as one of the most ecologically rich tree species. It provides an essential food source for numerous native butterflies, insects, beetles and wild bees. It also offers nesting sites for birds, while older specimens contain valuable cavities for bats, woodpeckers and rare fungi. As a pioneer species, it encourages the development of diverse forest communities.
A strategic planting for the beaver
Hëllef fir d’Natur highlighted that the presence of beavers in the area of the Mensdorf-Brill nature reserve provided an additional reason for choosing the aspen poplar. Evidence of beaver activity has been recorded at the other end of the Schlammwiss, in Uebersyren. Beavers are particularly fond of softwood species such as poplars and willows, which they use both as a food source and as building material for dams and lodges.
The planting of these three aspen poplars along the water buffalo ponds therefore forms part of a wider ecological corridor strategy aimed at supporting the return and long-term establishment of beavers in this area of the reserve.
Through this initiative, Hëllef fir d'Natur said it reaffirmed its belief that restoring native species is a practical and sustainable response to the challenges posed by biodiversity loss and climate change.
