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One of the UK’s Rarest Plants Given Vital Lifeline

The endangered species Field Wormwood is one of the rarest plants in the UK. Before our work to conserve this precious plant, just 530 individual plants were known in the UK.

Woman planting on a hill

One of the UK’s rarest plants, Field Wormwood, has been given a lifeline to try and boost the numbers of this endangered plant. This rare species is found nowhere in Britain apart from the Brecks where it has just been introduced to a new site. We have just undertaken the largest conservation effort for this plant for over 25 years.

Field Wormwood plant before being planted in the ground

Why does Field Wormwood Need Help?

Across the UK, Field Wormwood Artemisia campestris can only be found in the Brecks – at just 3 native sites and 7 translocation sites. It is one of the rarest plants in the UK and is listed as an endangered species, according to the GB Red List of Threatened Species.

It can thrive in the Brecks, but the numbers of this rare plant have dramatically declined due to development, forestry and intensive farming.

The impacts of theoretically losing Field Wormwood could also have drastic biodiversity impacts in the Brecks. Field Wormwood is particularly important for a very rare beetle Wormwood Moonshiner, which depends on the plants’ seeds for food during the cold autumn and winter months.

How Did we Translocate Field Wormwood?

In a bid to ensure this plant’s survival in the Brecks, we used a method called translocation – a process used in conservation which involves moving a plant to a new location where it will hopefully survive and thrive.

Recently, a total of 78 Field Wormwood plants were successfully translocated from Banham Zoo to Warren Hill, Mildenhall. The site was chosen for its steep slope and poor, chalky-sandy soils. It’s hoped the steep slopes will increase the plants’ chances of survival because this species is susceptible to grazing and unable to cope with competition from other vegetation.

The plants were grown from seed collected from the two largest remaining local sites by Plantlife and Natural England staff, cleaned and stored by Kew Millennium Seed Bank, then planted at Banham Zoo in February. Growing the plants at the Zoo gave them a headstart, optimising their chance of survival. The new site is owned by Forestry England and managed by Norfolk Wildlife Trust.

Before we started conservation work, there were just 650 individual plants in the whole of the UK. However, the species is widespread in Eastern Europe.

This translocation is also part of broader ambitions to develop our understanding of the ecology of Field Wormwood and the life cycle of the rare beetle, Wormwood Moonshiner, that appears to rely on Field Wormwood. It is part of a wider collaborative conservation effort between Plantlife, Banham Zoo, Natural England and Buglife.

Wormwood Moonshiner Amara fusca

How Could This Help a Rare Beetle?

The rare beetle Wormwood Moonshiner Amara fusca could greatly benefit if Field Wormwood populations could be restored.

This beetle has only ever been spotted at night, at sites where Field Wormwood is present – either feeding on the plant’s seeds or on adjacent Yarrow plants.

It is hoped that once established, this new site of Field Wormwood will attract the Wormwood Moonshiner beetle and help it to thrive.

The chosen translocation site is 3km from the nearest known site with Wormwood Moonshiner, so it will help us to learn if the beetle is able to move this far to find them.

Why is Field Wormwood Only Found in the Brecks?

The unique environment in the Brecks really suits this plant. With its long tap roots it can thrive in the Brecks’ nutrient-poor chalky-sandy soils, and cope with the dry, hot and cold conditions associated with this unique landscape. The Brecks, which spans across Norfolk and Suffolk, is one of the driest parts of the UK. Meanwhile plants which would outcompete it struggle to grow, leaving plenty of space for Field Wormwood.

What’s Next?

Now the plants are at the new site, we need to monitor how they grow. We will know the translocation has been a success once the plants are self-sustaining, which means they have set seed with enough germinated plants growing to replace the planted population. This could take up to 5 years.

Read more

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Bringing a Plant Back from Extinction

This great achievement is a result of decades of painstaking conservation work. Overtime, we’ve learnt more about the plant’s ecology, how to safeguard existing plants and then how to boost its numbers.

Tim Pankhurst, former Conservation Manager at Plantlife has dedicated his life’s work to protecting Fen Orchids. For captions watch on YouTube.

 

There are now over 10,000 individual plants in Britain, with 7 locations in England and 3 in Wales. Fen Orchid was previously classed as Endangered, but thanks to conservation work it is now classed as ‘Near Threatened’ according to the Botanical Society of Britain and Ireland (BSBI)’s new GB Red List.

The historic downgrading in threat status of Fen Orchid is thought to mark one of only a handful of plants that have been inched off the GB Red List due to conservation action since the system was introduced in 1977.

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What’s Special About the Fen Orchid?

Fen Orchids Liparis loeselii aren’t just striking, they’re also very rare – only flowering fleetingly in a precious few fens and sand dunes.

Interestingly, this wildflower is different to many others because it doesn’t usually grow in soil. Instead, Fen Orchids grow on clumps of moss or on sedge tussocks in wet areas called fens. They are dependent on the unique, open conditions of the fenland, a naturally marshy area.

It can also be a tricky wildflower to spot as it is small and inconspicuous. Its leaves wrap around the bottom of the single stem, which supports several yellowish-green flowers towards the top of the plant.

Learn more about the Fen Orchid.

Why Did Fen Orchids Almost Go Extinct?

The main reason that Fen Orchid numbers have declined is habitat loss – the abandonment and drainage of the fens. Orchid enthusiasts collecting plants have also played a part.

By 2010, there were just 3 locations in East Anglia and 1 dune site in Kenfig, Wales where Fen Orchids were reported growing. There were no more than 1,000 plants in total.

There were fears this plant would entirely disappear from the UK, especially as it is such a sensitive species that requires particular conditions.

Fen orchid field work

Tim Pankhurst, former Conservation Manager at Plantlife said: “Playing a leading role in reducing the threat status of such a beautiful yet mercurial orchid is a once in a lifetime opportunity for a botanist and one I will always treasure. As we face the enormous challenges of climate and biodiversity loss, this provides a moment of genuine hope for the future and is testament to what dedicated partnership conservation work delivered consistently over many decades can deliver.”

Since 2008, we’ve led efforts to rescue this plant through a multi-pronged conservation strategy, alongside partners. This wouldn’t have been possible without the decades of work by the Wildlife Trusts caring for the remaining plants and restoring former sites so they could be suitable for Fen Orchids. This work made the reintroductions of Fen Orchids possible.

Image credit: Cambridge University Botanic Garden

Peter Atkinson, Plants Records Officer at Cambridge University Botanic Garden, said: “At Cambridge University Botanic Garden, we’ve been investigating the life cycle of the Fen Orchid and successfully maintaining an ex-situ collection of plants for over a decade. Over this time, our field observations have deepened our understanding of the species, directly informing improved management of existing sites and helping wild populations increase from a few hundred to several thousand.

“We’re now seeing strong, sustainable populations re-establishing in the wild – a clear sign that this kind of long-term, collaborative conservation really does work.”

The threat status of Fen Orchid has reduced, but that doesn’t mean work is complete. This achievement can only be held by continuing conservation work, including sites continuing to be managed properly and future translocations of the plant.

Funders and partners involved in the English Fen Orchid Conservation Strategy include Norfolk Wildlife Trust, Suffolk Wildlife Trust, RSPB, Natural England, Butterfly Conservation, Broads Authority, Norfolk County Council, Cambridge University Botanic Garden, Royal Botanic Gardens and Kew.  Natural Resources Wales and Bridgend Council have spearheaded work in Wales.

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I’ve been spending a lot of time reading what little information there is on One-flowered Wintergreen, Moneses uniflora, doing site visits, and chatting with other experts. I’ve been trying to figure out what has caused its sharp decline in abundance and distribution globally, and how we can help prevent it here in Scotland.  

The uncomfortable answer I’ve come to is that we still don’t really know all that well. Around 10% of the Scottish population is in the Cairngorms, the rest distributed sparsely across the Highlands. In the last 50 years, I estimate that we’ve lost half of our populations, and of those remaining, only a few are stable or improving. We may soon lose all One-flowered Wintergreen in the UK without intervention. 

White bell like flowers called One Flowered Wintergreen

Saving One-flowered Wintergreen

Thousands of years ago, before significant human alteration to the landscape of Britain, perhaps One-flowered Wintergreen existed in a particular niche. It may have relied on the bare ground made by a wild boar digging for roots in the woodland, or the wood pulp made by a beaver chopping a tree, or the trampled ground under the hoof a mighty Auroch. 

In the modern world humans create this niche for them more than animals, and sadly, our modern management of pine woods has favoured it less. Through research and collaboration, we will be able to manage woodlands holistically, providing a mosaic of habitat for One-flowered Wintergreen in Scottish pinewoods, as well as other rare native species. 

In Autumn 2023 we translocated 109 individual One-flowered Wintergreen rosettes from two sites in to RSPB Abernethy, reinforcing a tiny relic population. This is a very early trial, as much a learning experience for future work, as it is to improve the condition of the Abernethy population.

I have been cautious to publicise this work, as, given no one has ever translocated One-flowered Wintergreen before (or even worked towards conservation of this species), I was prepared for total failure. However, the good news is, after 9 months at their new site, survival of rosettes remains above 70%. This is excellent for a plant translocation and bodes well for further Wintergreen translocations.

We hope to do more translocations to allow genetic mixing between populations and to rescue them from threatened sites. In addition to collecting plants for translocation, 12 plants went to Royal Botanic Gardens Edinburgh, where they have been working towards understanding the complex fungal interactions which One-flowered Wintergreen relies upon to survive, and in particular, to germinate.

Why is One-flowered Wintergreen in trouble? 

One-flowered Wintergreen is the only member of its genus Moneses, closely related to Pyrola, a group containing the other wintergreens, such as Intermediate Wintergreen (Pyrola media). Sadly, all are rare and in decline.  

True wintergreens are partial-mycoheterotrophs, which means that they have an alternative to photosynthesis for acquiring their energy to grow. They can parasitically take sugars and other minerals from fungus in woodland soils.

This ability to uptake energy from the soil as a supplement to their photosynthesis is likely part of why they are so challenging to understand and to propagate in captivity. There have also been suggestions that the presence of specific fungi is necessary for the tiny powder like seeds to germinate. 

What have we learnt?

One-flowered Wintergreen does not seem to have an easily definable niche. It is very rare, only occurring at specific sites, and often isolated to an area a few tens of metres across in a large and apparently suitable woodland.

Recently, we have had some breakthroughs helping us to understand this plant better. Trials of cattle grazing in woodland have yielded rapid recovery in a One-flowered Wintergreen population. Another site was heavily trampled and disturbed in the process of Rhododendron removal, again yielding rapid recovery of Wintergreen. These plants all seem to recover on sites where bare ground, trampled wood, and organic material are present.  

On forestry sites, One-flowered Wintergreen appears to grow only along forestry tracks and where the ground has been historically disturbed. A picture is starting to emerge of this species favouring periodic heavy disturbance of woodland soils.

Armed with this information we are providing advice to current land managers. We are also investigating options for a small-scale trial translocation of One-flowered Wintergreen, as much to aid in our learning of the needs of this rare flower, as to aid the genetic resilience of a small and struggling population.  

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Throughout February, Plantlife is participating in Reverse the Red’s Fungi month – a chance to better understand the mysterious worlds of some of our rarest fungi species.

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What is Reverse the Red?

Reverse the Red is a global movement aimed at raising awareness of the work being done by organisations and communities to reverse the trend of biodiversity loss, ensuring the survival of wild species and ecosystems.

The initiative brings together scientists, advocates, and partners who use data and science-based conservation approaches, with the goal of reducing our rarest species vulnerability, and eventually removing them from the Red list.

What is a Red List?

Red lists are a globally recognised way of listing and identifying the threat of extinction to species. Species are  assessed objectively based on ongoing scientific information and research.

The world’s most comprehensive list is the International Union for Conservation of Nature IUCN Red List of Threatened Species. There are other more local red lists, such as the Great British Red List.

Why do fungi need our help?

Fungi are a crucial partner to nearly all life on Earth, with an estimated 2.5 million species of fungi found around the world. But more than 90% of fungal species are unknown to science. 

This lack of data means it is hard to know if some of these important species need conservation help.

Only 0.4 % of fungi that we know about have had their global conservation status assessed for the IUCN Red List Assessment. That is only 0.02% of the fungi estimated to exist – imagine the amazing species yet to be found!

But we can help fungi.

People around the world are getting outside and recording fungi to help better understand them.

Since the beginning of 2020 more than 10,200 species of fungi have been named as new to science.

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New pools are being created at Greena Moor, a secluded Cornish nature reserve, for the endangered Three-lobed Water Crowfoot Ranunculus tripartitus.

The work was funded by Natural England through their Species Recovery Programme and charitable trusts including the Stuart Heath Charitable Settlement. Nature Reserves Manager Jonathan Stone  have been working to protect the ‘star’ of Greena Moor.

Three-lobed Water Crowfoot is an aquatic member of the buttercup family, the plant has small, white, starry flowers. Like most crowfoots, it has two kinds of leaves; the surface leaves are three-lobed and broad, but the underwater leaves – rarely seen with this species but seen here in this photo – are finely divided and feathery.

The plant was in only two pools

In March 2020, Three-lobed Crowfoot occupied only two small pools near the ford, covering an area of just 7m2, and it was clear that a lack of suitable shallow water bodies was preventing further spread of the species at Greena.

Cows in a field of grass by a gate in Greena Moor

Importance of Grazing

Grazing also plays an important role, helping to control competing vegetation and distributing seed. The cattle grazing at Greena appears ideal, and on the Cornish Lizard heaths Three-lobed Crowfoot has become far more common under similar management conditions.

White flowers with green leaves in a pool of water

10 New Natural Pools

The nature reserves management team have created 10 new pools to encourage more Three-lobed Crowfoot plant. We are very hopeful to seeing similar increases of this beautiful endangered plant over the coming years.

 

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