Swansea & Gower invasive plant guide
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Western Cleddau guide featuring Himalayan balsam
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Pembrokeshire · Waterway

Part of the Haverfordwest, Tenby & the Pembrokeshire Coast area guide

Western Cleddau

A practical local guide to habitats worth checking and the plants most likely to need careful identification.

Map of Western Cleddau

51.8100, -4.9700

The map shows the general area only. It does not mark confirmed invasive plant sites or individual properties.

About the area

Western Cleddau facts

Western Cleddau is a watercourse in the Swansea area, carrying water, seeds and soil downstream through the city and its valleys. It is part of the Haverfordwest, Tenby & the Pembrokeshire Coast area, within about 30 miles of Swansea.

  • The river flows about 50 kilometres south through Wolfscastle and Haverfordwest before turning tidal.
  • It joins the Eastern Cleddau at Picton Point, forming the Daugleddau estuary of the Milford Haven waterway.
  • Drains part of the Swansea area, eventually reaching Swansea Bay and the Bristol Channel.
  • Water levels rise quickly after heavy rain, moving gravel, soil and plant material downstream.

General local background, kept separate from the plant guidance below.

Local habitat

Where to look

Riverbanks, culverts, floodplain ground, wet ditches and bridge approaches are the main places where invasive or escaping garden plants can establish around Western Cleddau.

This is habitat guidance, not a claim that a particular property or site is infested.

Plants to recognise

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