Species Detail - Japanese Knotweed (Fallopia japonica) - Species information displayed is based on the dataset "Irish Vascular Plant Data - Paul Green".

Terrestrial Map - 10km

Distribution of the number of records recorded within each 10km grid square (ITM).
Live Map

Marine Map - 50km

Distribution of the number of records recorded within each 50km grid square (WGS84).
Live Map

Species image

Fallopia japonica
Fallopia japonica
Japanese Knotweed
Fallopia japonica var. compacta, Fallopia japonica var. japonica, Polygonum compactum, Polygonum compactum, Polygonum cuspidatum, Reynoutria japonica, Reynoutria japonica var. compacta, Reynoutria japonica var. compacta
Invasive Species: Invasive Species || Invasive Species: Invasive Species >> High Impact Invasive Species || Invasive Species: Invasive Species >> Regulation S.I. 477 (Ireland)
fajap
(Houtt.) Ronse Decr.
flowering plant
Species
99
72
40
01/01/1950
09/09/2015
2 January (recorded in 2018)
31 December (recorded in 2020)
Paul R Green, Irish Vascular Plant Data - Paul Green, National Biodiversity Data Centre, Ireland, Japanese Knotweed (Fallopia japonica), accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/178/Species/41674>

Records per month (across all datasets)

National Biodiversity Data Centre, Ireland, Japanese Knotweed (Fallopia japonica), image, accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/178/Species/41674>

Records per year (across all datasets)

National Biodiversity Data Centre, Ireland, Japanese Knotweed (Fallopia japonica), image, accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/178/Species/41674>