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Japanese knotweed · Co. Wicklow

Japanese knotweed in Co. Wicklow: 84 public records

Public biodiversity records hold 84 Japanese knotweed sightings for Co. Wicklow, the latest from 2025. A record near the house is a mortgage question, not a gardening one.

Figures compiled from the public records listed at the foot of this page. Data snapshot: . Updated when the records change.

Check one house in Co. Wicklow

84 Japanese knotweed records in Co. Wicklow, latest 2025.

One specific house in Co. Wicklow: knotweed records within 250 m of that Eircode, flood zone, radon, planning applications within 300 m, BER, sale history. Thirty-eight checks in all, each linked to the public record.

€19.99, free snapshot first. No account.

Or read the sample report first: a real house, 16 pages.

84

Japanese knotweed records in Co. Wicklow (GBIF / NBDC)

20

giant hogweed records

2025

most recent record year

Knotweed in Co. Wicklow

Japanese knotweed spreads along rivers and railways and from dumped garden waste. It goes three metres down and seven metres out, comes up through tarmac and drains, and a piece the size of a fingernail regrows. In Co. Wicklow, public biodiversity records (via GBIF, mainly the National Biodiversity Data Centre) hold 84 knotweed sightings. Counts depend on who was recording: a county with an active recorder scores high.

Records within 2 km of town centres, for the towns we hold detail on:

Rathnew16 records
Bray8 records
Wicklow Town8 records
Arklow7 records
Delgany3 records
Greystones2 records
Blessington1 record
Newtownmountkennedy0 records

For a house, what matters is a record within about 250 m, and the lane or stream behind the garden. Walk the boundary at a viewing; the stems are hollow, bamboo-like, with red speckles, and the leaves are shield-shaped.

Other checks for Co. Wicklow

Other checks for Co. Wicklow

Other counties

GuideJapanese knotweed in Ireland: how to spot it, what lenders do, what it costs

Questions people ask

How common is Japanese knotweed in Co. Wicklow?
The National Biodiversity Data Centre and other recorders have logged 84 knotweed records in Co. Wicklow (104 including giant hogweed), the latest in 2025. Records cluster along rivers, railway lines and roadsides, and reflect where people record as much as where the plant grows.
Will a bank lend on a house with knotweed?
Irish lenders have no blanket rule, but valuers now note it, and where it is within seven metres of the house they may ask for a management plan or knock the valuation. UK lenders decline outright. Ask the seller in writing whether it is or was on the property and for treatment records.
What does it cost to deal with?
Herbicide treatment runs three to five seasons at a few hundred euro a year for a small stand. Excavation and licensed disposal for a large stand runs into five figures. Never cut it and put it in the green bin: a fragment regrows.

Sources

Area figures, compiled from public records. They describe the town or county, not any one house. The paid report checks the exact Eircode.