checkmyhouse.ie

Japanese knotweed · Co. Cork

Japanese knotweed in Co. Cork: 1,556 public records

Public biodiversity records hold 1,556 Japanese knotweed sightings for Co. Cork, the latest from 2026. 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. Cork

1,556 Japanese knotweed records in Co. Cork, latest 2026.

One specific house in Co. Cork: 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.

1,556

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

52

giant hogweed records

2026

most recent record year

Knotweed in Co. Cork

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. Cork, public biodiversity records (via GBIF, mainly the National Biodiversity Data Centre) hold 1,556 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:

Cork City150 records
Cork147 records
Blackrock89 records
Bishopstown86 records
Douglas66 records
Bandon54 records
Rochestown33 records
Ballincollig31 records
Kinsale28 records
Glanmire23 records
Skibbereen22 records
Clonakilty17 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. Cork

Other checks for Co. Cork

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. Cork?
The National Biodiversity Data Centre and other recorders have logged 1,556 knotweed records in Co. Cork (1,608 including giant hogweed), the latest in 2026. 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.