Find out all about the Tree of the Year 2026 here: the aspen!
Description and features
The aspen (Populus tremula), also known as the trembling poplar, is a deciduous tree belonging to the willow family (Salicaceae). It generally reaches a height of 15 to 25 meters and has a slender, often translucent crown. The aspen can live for up to 100 years and reach a trunk diameter of 1 meter. Its rounded to heart-shaped leaves, with long petioles that are flattened on the sides, are particularly striking. They begin to tremble as soon as the wind blows slightly, which is how the tree got its name. The bark is smooth and gray-green when young, then darkens and cracks finely. In spring, the discreet catkin-shaped flowers appear even before the foliage buds.
Distribution and adaptability
The aspen is widespread throughout much of Europe and northern and central Asia. It grows equally well in lowlands and at high altitudes and is remarkably adaptable. A typical pioneer species, it quickly colonizes open spaces such as clear-cut areas, burned areas, and embankments. It is undemanding in terms of soil and grows equally well on nutrient-poor sites and on cool, well-aerated sites. Thanks to its extensive root system and its ability to reproduce by suckers and stumps, it can spread effectively and contribute to soil stabilization. This is also why the Hëllef fir d'Natur Foundation plants this tree as part of its reforestation work. In 2024, it planted 275 aspens, then 625 in 2025, and this year again, more aspens will be planted in our mixed deciduous forests.
Use and landscape significance
The aspen has relatively minor economic importance, but it is used in many ways. Its light, soft wood is suitable for making particle board, paper, saunas, and parquet flooring. The salicylic acid compounds found in the leaves and bark are believed to have analgesic, anti-inflammatory, and antipyretic properties. In landscaping, it is valued for its rapid growth and delicate appearance, particularly in nature parks, on the edges of forests, or in reforestation projects. It also plays an important role in the reforestation of degraded areas and contributes to landscape diversity.
A tree that is essential to biodiversity
The aspen is of great importance to biodiversity. It is one of the main food plants for native butterflies, as well as many species of insects, beetles, and wild bees. Many bird species also use it as a nesting and feeding tree. Old or dead specimens also provide cavities and dead wood structures that are essential for bats, woodpeckers, and fungi. As a pioneer tree, the aspen promotes the development of diverse forest communities and thus makes an important contribution to ecological balance.