Species Detail - Himalayan Knotweed (Persicaria wallichii) - Species information displayed is based on the dataset "Irish vascular plant data 1999-2009".

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

Persicaria wallichii
Persicaria wallichii
Himalayan Knotweed
Aconogonon polystachyum, Aconogonum polystachyum, Persicaria polystachya non Opiz, Persicaria polystachya non Opiz, Pleuropteropyrum polystachyum, Polygonum polystachyum, Rubrivena polystachya
Invasive Species: Invasive Species || Invasive Species: Invasive Species >> Medium Impact Invasive Species || Invasive Species: Invasive Species >> Regulation S.I. 477 (Ireland)
pewal
Greuter & Burdet
flowering plant
Species
1
1
1
21/08/2002
21/08/2002
22 March (recorded in 2014)
25 November (recorded in 2013)
Dr David Thomas Holyoak, Irish vascular plant data 1999-2009, National Biodiversity Data Centre, Ireland, Himalayan Knotweed (Persicaria wallichii), accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/35/Species/29165>

Records per month (across all datasets)

National Biodiversity Data Centre, Ireland, Himalayan Knotweed (Persicaria wallichii), image, accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/35/Species/29165>

Records per year (across all datasets)

National Biodiversity Data Centre, Ireland, Himalayan Knotweed (Persicaria wallichii), image, accessed 22 February 2025, <https://maps.biodiversityireland.ie/Dataset/35/Species/29165>