European Ash
Fraxinus excelsior
The European ash is a large deciduous tree reaching heights of up to 40 meters, characterized by its distinct black winter buds. Its pinnate leaves emerge late in spring and often drop while still green in autumn. The species prefers nutrient-rich, moist soils and is a vital component of riparian and ravine forests. Currently, the population is severely threatened by ash dieback, caused by an invasive fungal pathogen.
Details
Oxygen production
High oxygen production during the growing season due to large leaf mass.
Habitat function
Nesting site for birds, substrate for mosses and lichens, food source for specialized insect larvae.
Nutrient uptake
High demand for nitrogen and calcium; efficient nutrient cycling via the foliage.
Food source for
Seeds for birds (bullfinch) and rodents; leaves for caterpillars (e.g., Ennomos fraxineti); buds for cervids.
Human use
High-quality wood for tools and sports equipment, furniture making, interior finishing, historically used as fodder for livestock.
Ecology
Ecological role
Important climax and pioneer tree species in moist forests; provides habitat for numerous specialized insects and epiphytes.
Natural predators
Hymenoscyphus fraxineus (ash dieback), ash bark beetle, roe deer (browsing).
Competitor species
European beech, sycamore maple, wych elm.
Ecosystem service
Timber production, erosion control, carbon sequestration, soil improvement through easily decomposable litter.
Threats
Invasive ash dieback (fungal infection), climate change (drought stress), potential infestation by the emerald ash borer.
Scientific profile
Profile
Protection & threats
Main threats
Invasive fungal disease (ash dieback), climate-induced drought stress, loss of retention areas and natural river dynamics.