Giant Hogweed 2023 Tyne Report

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Giant Hogweed Report for River Tyne 2023


We have reached the end of Year 5 of our River Tyne Giant Hogweed Eradication Programme which has once more been a very successful year in achieving our objective.

We were once again able to use the invaluable on-line mapping tool which reminded us where to look for Giant Hogweed plants as at the start of 2023 our map showed us the sightings from 2022. That of course is where the seeds in the ground already are and would be likely to germinate this year.

Many thanks to all our spotters again who got started in April and May and sent in GPS sightings to the dynamic GPS map which began to be populated with 2023 sightings. We are very grateful to Dave Quarendon for managing this unique GPS mapping tool for use by landowners to assist in locating plants to spray.

I have been impressed by the continued and improved support of all the landowners but as we begin to see fewer plants next year, then we need to remember to check all the areas we have previously for any later germinating seeds. ​​ 

This year we decided to bring forward our “green Tick” inspection once more to late May rather than early June as we had done in the earlier years. This made final removal of any missed and budded plants easier; so next year it would be helpful, for all landowners to try to get their final spraying all complete by 2nd week in May. This will ensure that any spayed plants are dying by end of May before we carry out our “green tick” inspection.

Any missed or plants sprayed far too late after flowering has occurred are still potentially able to produce a viable seedhead so the heads need to be removed and disposed of safely. Roundup can be sprayed down the cut stem to kill it or by digging out the root.

Because of this, plants left to flower create a huge amount of work compared to timely spraying at the leaf stage.



Remember our maxim no plant must be allowed to flower.

A single flowering plant is capable of producing over 10,000 seeds

A close up of some plants

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This photo shows the consequence of leaving one plant to flower. Each of these little germinated seedling plants is a Giant Hogweed plant.




This year we have continued to get reports from volunteers of Giant Hogweed plants in areas around East Lothian outwith our Rivers. This is good because if we can get these areas Giant Hogweed free, it reduces the risks of reinfection into the areas that we have spent years clearing.

It is this combined and consistent effort that will eventually remove Giant Hogweed from the River Tyne and a wider area.

I have concentrated on Giant Hogweed in my comments, but it is important to note that we have also been dealing very successfully with Japanese Knotweed in the upper and lower stretches of the River Tyne and its tributaries.

​​ I hope that as we move to future years that greater emphasis will be given to Himalayan Balsam as it is keen to fill any void in the river edge. My view has always been to encourage landowners to spray it on the way past as we look for Giant Hogweed plants.

We are once again most grateful to Bayer UK for their continuing support in supplying some Roundup for use by knapsack sprayer licenced landowners.