Tamar Catchment - Invasive Non-Native Species Questionnaire

The Tamar Valley National Landscape Partnership is seeking information on the presence and spread of Giant hogweed,Japanese knotweed, Himalayan balsam and American skunk cabbage in the wider river catchment.

As much of the recruitment of seeds or viable plant fragments wash down rivers, it is important to understand their extent in the wider catchment from which new invasive plants may enter the lower reaches of the river and estuary.

We are therefore looking for help in identifying where these four plant species are upstream and in what numbers. For this we need to tap the knowledge of local people and societies within the Tamar Catchment area and are looking for participants to share their information with us.

This up-to-date information will help to inform a feasibility study that has been commissioned for the possible development of a control programme.

Information about the four species of principal interest can be found at Plant Atlas 2020.

In completing the form, please indicate to which river valley or area the information relates.

Please do share this questionnaire, if you know of others who may be interested.

Many thanks for your help with this.