iNaturalist · 2026-05-30
Black ash (Fraxinus nigra) is one of the most-observed plants on iNaturalist this week, with 294 research-grade observations logged. This native wetland tree, already under severe pressure from the invasive emerald ash borer, is drawing heightened attention from naturalists across its range.
294 research-grade observations of black ash were recorded on iNaturalist in a single week, placing it among the most-observed plant species.
Black ash is a wetland-specialist native tree critically threatened by the invasive emerald ash borer (Agrilus planipennis), which has devastated North American ash populations.
Citizen-science observation spikes like this can serve as early-warning signals or reflect seasonal phenology windows when the species is most identifiable.