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Organic trials to save flower from extinction

Trials are being carried out at the Royal Agricultural University (RAU) to determine the best conditions to reintroduce a seed on the brink of extinction.

The Red Hemp-nettle’s distinctive twin flowers were a common sight 60 years ago. Now herbicides, fertilisers, and the spread of highly productive crop varieties have seen it almost disappear from fields.

 

Germination and survival of the Red Hemp-nettle will be monitored under three different conditions - normal drilling rates, reduced drilling rates, and in uncropped plots.


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Biodiversity

 

Dr Kelly Swallow, senior lecturer in ecology and agro-ecosystems at the RAU said: “Although once classified as a weed, the reintroduction of this scarce plant is important, not only for its aesthetic contribution to the landscape, but because biodiversity is key to the health of our environment and ecosystem functions. Students are keen to be involved throughout this project.”

Critical

 

Described by Plantlife’s farmland advisor and Colour in the Margins project manager Cath Shellswell as ‘a short but conspicuous plant with a spike of two-lipped red flowers at the top and nettle-shaped leaves below’ Red Hemp was common in southern England and South Wales.

 

Now found in only a few dozen places and classed as ‘critically endangered’, it thrives on light sandy or chalky soils in disturbed places such as field margins and other open, sunny places.

 

Chosen

 

The RAU was selected by Plantlife, as a partner in its Red Hemp-nettle reintroduction experiment, part of Natural England’s biggest ever species conservation initiative, Back From The Brink.

 

Work began in April when 27,000 seeds from the Royal Botanic Gardens, Kew Millennium Seed Bank were sown in experimental plots under organic production, at the University’s Harnhill Farm, just outside Cirencester.

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