Concerns have been raised regarding dangerous vegetation appearing along waterways in the Gwent region.
Giant hogweed, classified as an invasive and perilous species, has been observed at multiple locations bordering the River Usk.
The alerts have been circulated by Natural Resources Wales alongside Bannau Brycheiniog as a component of the Four Rivers for LIFE initiative.
Recent confirmations have come from areas surrounding Glangrwyney, with further instances documented in Llangattock, Gilwern, and Govilon.
Representatives from Bannau Brycheiniog emphasised that given the considerable dangers this vegetation presents to both people and wildlife, the national park authority would be coordinating with property owners to locate specimens and recommend appropriate eradication strategies.
Members of the public have been urged to avoid physical contact with any portion of the plant upon discovery and to submit reports through local Biological Records Centres or via the LERC Wales mobile application.
Giant hogweed presents significant danger due to its highly poisonous sap, which can produce serious dermatological injuries when exposed to sunlight, with symptoms potentially returning for extended periods.
The vegetation is capable of growing to heights reaching five metres and typically establishes itself along river margins in lowland areas, on neglected agricultural land, and on derelict sites throughout Britain.
Its expansive serrated foliage, substantial hollow stalks marked with purple markings, and considerable dimensions differentiate it from comparable species such as common hogweed and cow parsley.
Project representatives from Four Rivers for LIFE highlighted that as warmer conditions arrive and the active growth phase commences, heightened vigilance from the public becomes essential.
The species demonstrates aggressive competitive behaviour against indigenous flora, resulting in diminished botanical variety.
The Four Rivers for LIFE initiative, financed through the EU LIFE Programme with backing from the Welsh administration, has been engaged for four years in managing non-native species populations throughout the River Usk corridor.
This programme involves substantial partnership with community volunteers, park authority personnel, and the Wye and Usk Foundation.