Welcome to the Living Ash Project

As Chalara ash dieback spreads across the British Isles, we aim to identify and secure ash trees that show good tolerance to Hymenoscyphus pseudoalbidus - the fungus that causes ash dieback (formerly known as Chalara fraxinea) - and use these individuals to form the nucleus of a future breeding programme.

We will be assessing the many thousands of trees that exist already in a breeding programme for ash, and we will use citizen science to screen the wider population. We will produce trees that show good tolerance to the fungus, and plant them on the public forest estate as an archive, freely available to the forest industry.

We will also develop techniques to enable us to rapidly produce large numbers of tolerant trees for reforestation.

We asked the public to get involved by tagging a tree and carrying out an annual survey using the Ashtag app. The survey ran from 2013-17 and is now closed.

This project will run for five years and is funded by Defra.

The Survey

Thank you for your interest in taking the Living Ash Project survey in conjunction with Ashtag. This survey is now closed.

Between 2013 - 2017 metal identifying tags, or "Ashtags", were sent out to citizen scientist across the country to enable volunteers to help us identify ash trees that were potentially tolerant to ash dieback. If you have tagged a tree in the past, we thank you for your participation. Regrettably, we were unable to visit every tagged tree, but prioritised those growing in woodlands alongside other ash trees, and this yielded some good results for the project.

More than 1,500 trees were tagged by volunteers, of these a small proportion were identified by scientists as being of interest to the Living Ash Project. All such volunteers have already been contacted and our collaboration with them is ongoing. If you have not heard from us, we suggest you remove your Ashtag from your tree.

Keep updated with project news.

Image courtesy of Fera

Background Infomation

The Living Ash Project is a Defra-funded consortium comprising representatives from Earth Trust, Future Trees Trust, Sylva Foundation and Forest Research. It aims to identify a large and diverse number of ash trees with good tolerance to Chalara ash dieback, to secure this material for further breeding work, and to quickly make this material available to industry.

There are an estimated 120 million ash trees in Britain in woodlands and hedgerows. Evidence from Denmark where the disease is more prevalent indicates that approximately 1% of trees show good resistance (less than 10% crown dieback) which is under moderately strong genetic control. Similar levels of tolerance would equate to 1.2 million potentially resistant trees in Britain.

While natural selection in some woodlands may provide resistant regeneration, the identification of resistant trees is needed as the basis for a genetically diverse and resilient population for future productive woodland plantings, as envisaged in the Independent Panel on Forestry’s report and Defra’s Chalara Management Plan.

The Living Ash Project aims to secure ash trees for the future that show resistance to Chalara ash dieback. It is important that at least a good proportion of trees that make it through a screening programme will be suitable for timber production to ensure a continued supply of this valuable product for the future.

The project partners have been working on breeding ash for improved timber characteristics (form and vigour) for over twenty years and in this time have assembled a substantial collection of genotypes. Three hundred and eighty "superior" trees have been selected in the wild across Britain, and 114 selected in Ireland, and replicated either in progeny trials (from seed) or in clonal seed orchards (as grafted cuttings). In addition, we manage 18 provenance trials containing over 40,000 trees of material from across ash's native range.

The project incorporates work programmes to:

  1. identify individuals that show tolerance of Chalara ash dieback to a good degree, within selected and tested populations
  2. use citizen science to find tolerant individuals in the wider population
  3. screen these individuals using markers developed by other Defra funded research
  4. secure this material in archives for further breeding purposes
  5. develop techniques for rapid bulking up of tolerant genotypes for deployment to the industry

In total, including in-kind contributions from the many partners, the project will cost approximately £1.2M and will take around six years to complete.

Image courtesy of Fera

Partner Organisations

Earth Trust

Project Lead & Field Trials

Earth Trust is an environmental learning charity that encourages and helps people to live more sustainably. Pioneering research into broadleaved trees for 20 years, the Earth Trust owns and manages Paradise Wood, a national research woodland, as well as a landscape which includes semi-natural woodlands, new plantings and farm woods. Paradise Wood is a unique resource holding the largest genetic collection of hardwood timber trees in the UK and the largest number of tree improvement trials in Great Britain and Ireland. The Earth Trust’s learning and engagement focuses on many audiences from the general public to industry and land management practitioners, covering a wide range of themes relevant to our countryside and landscape, such as future forests, living histories, water and wetlands, and food and farming.

For more information, visit earthtrust.org.uk or call Jo Clark on 01865 409411

Sylva Foundation

Citizen science

Sylva Foundation is a forestry charity working to revive Britain's wood culture. Registered in both England & Wales, and in Scotland, it supports over four thousand woodland owners across Britain in managing their woodlands sustainably through the myForest service. It also runs a range of science and education initiatives including a research scholarship with the University of Oxford, the British Woodlands Survey, the OneOak project, SilviFuture, and sponsored The New Sylva book.

For more information, visit sylva.org.uk or call Gabriel Hemery on 01865 408018

Future Trees Trust

Knowledge exchange

Future Trees Trust is a registered charity dedicated to encouraging the breeding of broadleaved trees to improve their growth rate, form and resilience to disease and a warming climate. Their vision is to realise economic, social and environmental benefits so that by 2050, anyone planting broadleaved woodland can do so using trees that will produce the maximum volume of recoverable timber. Their membership comprises tree breeders, silviculturalists, foresters and practitioners from across the forestry sector.

For more information, visit futuretrees.org or call Tim Rowland on 01453 884264

Forest Research

Genetic studies

Forest Research is an agency of the Forestry Commission and is one of the world's leading centres of research into woodlands and forestry. It aims to provide robust quality science to inform the development and delivery of UK Government and devolved administration forest policies and to provide the evidence base for sustainable forest management.

For more information, visit forestry.gov.uk/forestresearch.



The Department for the Environment Food and Rural Affairs (Defra) is the lead government department responsible for tree and plant health issues. Plant Health is one of Defra’s top 4 priorities.

Defra published the Chalara Management Plan (CMP) in March 2013. The implementation measures in the plan relate to England only, as Devolved Administrations are publishing their own plans. The CMP recognises that we can’t stop Chalara from spreading but that we can focus on reducing the rate of spread while we look for genetic strains of ash that will be resistant to Chalara. Project of this nature will be important to the successful implementation of the CMP.


Summer 2017 update

Workshop in Grassington & 1,500 ashtags disseminated • archive site identified • three field trials established

2017 has been a very busy year for the Living Ash Project. As we entered our final year, we started off with a successful workshop held at Grassington, kindly hosted for us by the Yorkshire Dales National Park. Over 50 delegates heard about the work of the Living Ash Project, and how they could help with locating tolerant trees which will be grafted and placed in an archive in southern England for further research. After the morning session of presentations, we visited Grass Woods (curtesy of Yorkshire Wildlife Trust) to look at symptoms of ash dieback. Discussion centered around management issues once ash dieback is present.

Our citizen science programme - Ashtag - has seen over 1,500 Ashtags disseminated. Volunteers have been recording data on their trees such as its size, its location and proximity to other ash. The project is particularly interested in those trees located in woodlands where many ash trees are present. This will enable us to locate those trees that are looking healthy, that are in close proximity to other ash trees that are infected, thereby ensuring an element of natural infection. We have visited a number of these trees over the summer and will be collecting cuttings from some of them to graft onto rootstocks for further research.

We have identified a site on the public forest estate in Hampshire where all the trees that we think may be tolerant to ash dieback will be planted out. Early on, this will function as an archive, but with time will form a breeding population.

Also this summer, we have visited over 50 forestry estates where ash forms a major component of the woodland cover. These estates provided the original ‘plus trees’ that Future Trees Trust collected for their breeding programme which started in the 1990s. By revisiting these estates, which occur right across the country, we have built up a good picture of where ash dieback is most severe, and where we can start selecting tolerant trees, which again, we will graft this coming winter. Areas that are particularly badly affected - that is to say, symptoms are clearly evident on large mature trees - include Yorkshire, Kent, Sussex and to a lesser extent Norfolk and Suffolk.

An estate in Yorkshire badly affected by ash dieback

We have also established three new trials with seedlings from our breeding programme which was underway before the arrival of ash dieback. This breeding programme had been successful is providing ash trees of the highest category under reproductive regulations, and the population has been much studied. Ash is dioecious - male and female trees are separate unlike an oak tree which is both male and female. We have fingerprinted every tree in this population. If any of the seedlings in our news trials show tolerance to ash dieback, we will be able to identify both the mother seed tree and the pollen father which will be extremely useful for future breeding work.

Jo Clark, Living Ash Project, Project Manager


Living Ash Project, Yorkshire Dales 2017


Biology of Chalara June 2017 presentation


Silviculture and Management June 2017 presentation


Living Ash Project 2014


Mapping inheritance presentation


Citizen science presentation



That's Oxfordshire June 2016

The Observer May 2016

read article

Interview on BBC World Service

listen here

Oxford Times April 2016


technical articles

Ecological impacts of ash dieback and mitigation measures


QJF July 2014


Ash Dieback Kent Guidance


FC Chalara ID guide


Tree Council - Chalara in non woodland situations


Natural England - Ecological impacts of Chalara


Defra chalara management plan 2013


NE FC Ash dieback SSSI management advice April 2015


Temporal development of collar necroses and butt rott


Observatree Field guide - Chalara


FC advice on managing woodlands with Chalara dieback