Species Detail - Himalayan Knotweed (Persicaria wallichii) - Species information displayed is based on the dataset "BSBI tetrad data for Ireland".

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
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
71
55
30
01/01/1930
31/12/2010
22 March (recorded in 2014)
25 November (recorded in 2013)
Botanical Society of the British Isles, BSBI tetrad data for Ireland, National Biodiversity Data Centre, Ireland, Himalayan Knotweed (Persicaria wallichii), accessed 13 July 2020, <https://maps.biodiversityireland.ie/Dataset/9/Species/29165>

Records per month (across all datasets)

Records per year (across all datasets)